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832 ELECTROCHEMICAL STORAGE FOR PHOTOVOLTAICS at the negative electrode. In VRLA batteries, the electrolyte is not in the liquid phase and therefore no spillage of electrolyte occurs in case of any break of the case or other accidents. However, if the battery is incorrectly overcharged, more gas is generated than can recombine, so the gas must be able to leave the cell through the valve if an overpressure builds up. At the same time, the valve must prevent ambient air from entering the battery. As these batteries cannot be refilled with water, blowing off the gas from the cell must be reduced to a minimum to prevent the cell from drying out. As a rule of thumb, after more than 10% water loss the battery is at the end of its lifetime. The water loss can be estimated by the weighting of the battery. To achieve low gassing rates in VRLA batteries, normally lead–calcium alloys are used for the grids. Flooded batteries use mainly lead–antimony alloys with less than 2.5% antimony (Sb). This is a good compromise among the beneficial effects of antimony grids (good grid conditions for casting and good contact of the active material to the grid result in low contact resistance) and the harmful effect of the reduction of the hydrogen overvoltage caused by the antimony. However, as gassing needs to be minimised in VRLA batteries, antimony grids are not an appropriate choice. Especially, in the early days of the VRLA batteries, the antimony-free grids caused a significant reduction in battery lifetime through the so-called antimony-free effect. This effect is described in the literature as premature capacity loss (PCL) [16]. While the rated capacity of a cell depends on the geometry and the number of parallel-connected electrodes, the rated voltage of a cell is 2.0 V. The open-circuit voltage U 0 of the cell depends on the electrolyte concentration as shown in Figure 18.14, but for practical purposes the open-circuit voltage can be determined by the following rule of thumb: U 0 V = ρ + 0.84 ...0.86 (18.11) 3 g/cm where ρ is the density of the electrolyte. Electrolyte concentration and electrolyte density have an almost linear relation. As the electrolyte density can be easily measured, the electrolyte density is often used to express the electrolyte concentration. At 25 ◦ C, 30% H 2 SO 4 in H 2 O has a density of about 1.22 g/cm 3 and 40% H 2 SO 4 in H 2 O has a density of 1.30 g/cm 3 . Typical electrolyte densities in fully charged batteries are between 1.22 and 1.32 g/cm 3 , depending on the application, the technological type and the climatic conditions. The acid density in the discharged state is between 1.18 and 1.05 g/cm 3 . According to equation 18.11, the open-circuit voltage also varies with the density. It is not a constant by any means. Figure 18.14 shows the correlation between the electrode and cell potentials and the acid concentration. The acid concentration can be measured by means of the concentration in mol/l, the density in g/cm 3 and the percentage of acid in the solution % weight . This allows the translation of all values to one another. According to equation (18.7), the electrolyte concentration decreases during discharge. According to equation (18.11) the open-circuit voltage decreases in a manner directly proportional to the acid concentration. VRLA (sealed) batteries have less electrolyte per ampere-hour capacity than flooded batteries. Therefore, the open-circuit voltage
SECONDARY ELECTROCHEMICAL ACCUMULATORS 833 Potential neg. elect. [V] −0.35 −0.3 2.3 Potential pos. elect. [V] 1.5 1.6 1.7 1.8 1.9 H 2 SO 4 concentration [mol/l] 0 1 2 3 4 5 6 7 2.3 2.2 2.2 Cell potential [V] 2.1 2.0 2.1 2.0 Cell potential [V] 1.9 1.9 1.8 1.8 −0.35 −0.3 1.5 1.6 1.7 1.8 1.9 1.4 1.4 H 2 SO 4 gravity [g/cm 3 ] 1.3 1.2 1.1 1.3 1.2 1.1 H 2 SO 4 gravity [g/cm 3 ] 1.0 0 10 20 30 40 50 H 2 SO 4 concentration [%] 0 1 2 3 4 5 6 7 H 2 SO 4 concentration [mol/l] 1.0 Figure 18.14 Correlation between the acid concentration in percent, mol/l or density and the equilibrium potential of the negative and positive electrodes and the cell potential. The graphs allow converting each value to the other decreases more rapidly in sealed batteries during discharge than in flooded batteries. This must be taken into account, if the voltage is used as an SOC indicator. Today, two different plate technologies are commonly used. The most common type of plate is the flat plate (Fauré type). The porous active mass is applied to the hard lead grid as a paste. The flat plate is simple and cheap to produce. The so-called tubular plates 10 are also widespread. A central lead rod, surrounded by active material, is inserted into a protective tube that is permeable to the electrolyte. A plate then consists of a row of adjacent tubes. While flat-plate electrodes have lower internal resistance and therefore higher specific power than tubular plates, the latter show more cycles in their lifetime. Manufacturing of tubular plates is more expensive than the manufacturing of flat plates. Figure 18.15 shows schematics of a flat-plate and a tubular-plate electrode. Currently, wounded lead cells come into the market consisting of a thin lead foil pasted with active material and with a very thin glass-mat separator between the electrodes. These batteries 10 Tubular-plate electrodes are not very common in North America. Traditionally, tubular-plate batteries are more popular in Europe for cycling applications like, for example, fork-lift trucks.
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Handbook of Photovoltaic Science an
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We dedicate this book to all those
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xxiv LIST OF CONTRIBUTORS Phone: +1
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xxvi LIST OF CONTRIBUTORS 28040 Mad
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Contents List of Contributors xxiii
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CONTENTS ix 4.3.1 The Balance Equat
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CONTENTS xi 7.4 Manufacturing Proce
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CONTENTS xiii 9.8 Future-generation
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CONTENTS xv 12.1.2 Designs for Amor
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CONTENTS xvii 14.3.3 CdS/CdTe Inter
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CONTENTS xix 18.2.2 Batteries with
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CONTENTS xxi 22.2 PV in Architectur
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1 Status, Trends, Challenges and th
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WHAT IS PHOTOVOLTAICS? 3 1.2 WHAT I
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SIX MYTHS OF PHOTOVOLTAICS 5 Sunlig
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SIX MYTHS OF PHOTOVOLTAICS 7 of 10
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SIX MYTHS OF PHOTOVOLTAICS 9 2500 W
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HISTORY OF PHOTOVOLTAICS 11 the maj
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HISTORY OF PHOTOVOLTAICS 13 the USA
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PV COSTS, MARKETS AND FORECASTS 15
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PV COSTS, MARKETS AND FORECASTS 17
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GOALS OF PV RESEARCH AND MANUFACTUR
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GLOBAL TRENDS IN PERFORMANCE AND AP
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CRYSTALLINE SILICON PROGRESS AND CH
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CRYSTALLINE SILICON PROGRESS AND CH
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THIN FILM PROGRESS AND CHALLENGES 2
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THIN FILM PROGRESS AND CHALLENGES 2
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CONCENTRATION PV SYSTEMS 31 reality
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BALANCE OF SYSTEMS 33 Percentage of
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BALANCE OF SYSTEMS 35 Total capital
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FUTURE OF EMERGING PV TECHNOLOGIES
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CONCLUSIONS 39 Yet, in all these al
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REFERENCES 41 the other hand, hybri
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REFERENCES 43 69. Mickelson R, Chen
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46 MOTIVATION FOR PV APPLICATION AN
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62 THE PHYSICS OF THE SOLAR CELL Su
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64 THE PHYSICS OF THE SOLAR CELL 3.
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66 THE PHYSICS OF THE SOLAR CELL E
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72 THE PHYSICS OF THE SOLAR CELL an
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74 THE PHYSICS OF THE SOLAR CELL pr
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76 THE PHYSICS OF THE SOLAR CELL No
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80 THE PHYSICS OF THE SOLAR CELL El
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82 THE PHYSICS OF THE SOLAR CELL wh
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84 THE PHYSICS OF THE SOLAR CELL n
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86 THE PHYSICS OF THE SOLAR CELL Th
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88 THE PHYSICS OF THE SOLAR CELL Th
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94 THE PHYSICS OF THE SOLAR CELL Ta
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96 THE PHYSICS OF THE SOLAR CELL cu
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100 THE PHYSICS OF THE SOLAR CELL 5
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102 THE PHYSICS OF THE SOLAR CELL I
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106 THE PHYSICS OF THE SOLAR CELL T
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108 THE PHYSICS OF THE SOLAR CELL S
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114 THEORETICAL LIMITS OF PHOTOVOLT
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5 Solar Grade Silicon Feedstock Bru
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SILICON 155 faces of silicon are (1
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SILICON 157 powder in the presence
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SILICON 159 5.2.4.1.2 Wrought alloy
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PRODUCTION OF METALLURGICAL GRADE S
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PRODUCTION OF SEMICONDUCTOR GRADE S
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CURRENT SILICON FEEDSTOCK TO SOLAR
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CURRENT SILICON FEEDSTOCK TO SOLAR
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REQUIREMENTS OF SILICON FOR CRYSTAL
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ROUTES TO SOLAR GRADE SILICON 193 c
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ROUTES TO SOLAR GRADE SILICON 195 c
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ROUTES TO SOLAR GRADE SILICON 197 d
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ROUTES TO SOLAR GRADE SILICON 199 d
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CONCLUSIONS 201 2. Another German c
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REFERENCES 203 34. Fischler S, J. A
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6 Bulk Crystal Growth and Wafering
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BULK MONOCRYSTALLINE MATERIAL 207 b
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BULK MONOCRYSTALLINE MATERIAL 209 (
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BULK MONOCRYSTALLINE MATERIAL 211 O
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BULK MONOCRYSTALLINE MATERIAL 213 8
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BULK MULTICRYSTALLINE SILICON 215 I
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BULK MULTICRYSTALLINE SILICON 217 1
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BULK MULTICRYSTALLINE SILICON 219 b
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BULK MULTICRYSTALLINE SILICON 221 L
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WAFERING 223 This in turn verifies
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WAFERING 225 suspension of hard gri
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WAFERING 227 tips, they can exert v
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WAFERING 229 6.4.3 Wafer Quality an
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SILICON RIBBON AND FOIL PRODUCTION
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NUMERICAL SIMULATIONS OF CRYSTAL GR
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CONCLUSIONS 251 the supercooling de
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REFERENCES 253 28. Sahoo R et al.,
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7 Crystalline Silicon Solar Cells a
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CRYSTALLINE SILICON AS A PHOTOVOLTA
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CRYSTALLINE SILICON SOLAR CELLS 259
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MANUFACTURING PROCESS 271 The most
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MANUFACTURING PROCESS 273 3. Textur
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MANUFACTURING PROCESS 275 materials
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MANUFACTURING PROCESS 277 nearly 50
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MANUFACTURING PROCESS 279 Figure 7.
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VARIATIONS TO THE BASIC PROCESS 281
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MULTICRYSTALLINE CELLS 283 of defec
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MULTICRYSTALLINE CELLS 285 better s
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MULTICRYSTALLINE CELLS 287 Figure 7
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OTHER INDUSTRIAL APPROACHES 289 TCO
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CRYSTALLINE SILICON PHOTOVOLTAIC MO
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CRYSTALLINE SILICON PHOTOVOLTAIC MO
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ELECTRICAL AND OPTICAL PERFORMANCE
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FIELD PERFORMANCE OF MODULES 301 7.
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REFERENCES 303 REFERENCES 1. Luque
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REFERENCES 305 75. Lenkeit B et al.
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8 Thin-film Silicon Solar Cells Bhu
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INTRODUCTION 309 Open circuit volta
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A REVIEW OF CURRENT THIN-FILM SI CE
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CVD Excimer laser crystallization U
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n-type silicon (0.2 µm) p-type sil
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DESIGN CONCEPTS OF TF-SI SOLAR CELL
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CONCLUSION 353 Introduction of H af
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REFERENCES 355 17. Kamins T, Ed, Po
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REFERENCES 357 98. Symko M, Sopori
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360 HIGH-EFFICIENCY III-V MULTIJUNC
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10 Space Solar Cells and Arrays She
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THE HISTORY OF SPACE SOLAR CELLS 41
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THE CHALLENGE FOR SPACE SOLAR CELLS
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SILICON SOLAR CELLS 425 Figure 10.7
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III-V SOLAR CELLS 427 n+-GaAs n-AlI
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III-V SOLAR CELLS 429 missions with
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SPACE SOLAR ARRAYS 431 supported af
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SPACE SOLAR ARRAYS 433 JPL-25888AC
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SPACE SOLAR ARRAYS 435 Figure 10.13
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SPACE SOLAR ARRAYS 437 Figure 10.15
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SPACE SOLAR ARRAYS 439 0.31 Astrono
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FUTURE CELL AND ARRAY POSSIBILITIES
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FUTURE CELL AND ARRAY POSSIBILITIES
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POWER SYSTEM FIGURES OF MERIT 445 A
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REFERENCES 447 8. Statler R, Curtin
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11 Photovoltaic Concentrators Richa
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INTRODUCTION 451 markets most often
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BASIC TYPES OF CONCENTRATORS 453 ha
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BASIC TYPES OF CONCENTRATORS 455 is
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BASIC TYPES OF CONCENTRATORS 457 sk
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BASIC TYPES OF CONCENTRATORS 459 Ho
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HISTORICAL OVERVIEW 461 thereafter.
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HISTORICAL OVERVIEW 463 Figure 11.6
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HISTORICAL OVERVIEW 465 production
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HISTORICAL OVERVIEW 467 Figure 11.1
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HISTORICAL OVERVIEW 469 n + bussbar
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HISTORICAL OVERVIEW 471 array [33].
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HISTORICAL OVERVIEW 473 Solar radia
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OPTICS OF CONCENTRATORS 475 q max,
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OPTICS OF CONCENTRATORS 477 If r 1
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OPTICS OF CONCENTRATORS 479 r i Med
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OPTICS OF CONCENTRATORS 481 When θ
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OPTICS OF CONCENTRATORS 483 filled
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OPTICS OF CONCENTRATORS 485 q i q i
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OPTICS OF CONCENTRATORS 487 For lar
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OPTICS OF CONCENTRATORS 489 on a co
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OPTICS OF CONCENTRATORS 491 gleaned
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OPTICS OF CONCENTRATORS 493 Solar c
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CURRENT CONCENTRATOR ACTIVITIES 495
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REFERENCES 501 11. Boes E, “Photo
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REFERENCES 503 60. Uematsu T et al.
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506 AMORPHOUS SILICON-BASED SOLAR C
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13 Cu(InGa)Se 2 Solar Cells William
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INTRODUCTION 569 CdS. The latter en
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MATERIAL PROPERTIES 571 Even though
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MATERIAL PROPERTIES 573 800 d 785 T
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MATERIAL PROPERTIES 575 3.2 x = 0.2
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MATERIAL PROPERTIES 577 1µm Figure
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DEPOSITION METHODS 579 though other
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DEPOSITION METHODS 581 much higher
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DEPOSITION METHODS 583 in the tempe
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JUNCTION AND DEVICE FORMATION 585 f
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JUNCTION AND DEVICE FORMATION 587 0
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JUNCTION AND DEVICE FORMATION 589 T
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JUNCTION AND DEVICE FORMATION 591 d
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DEVICE OPERATION 593 the voltage. F
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DEVICE OPERATION 595 1.0 0.8 500 80
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DEVICE OPERATION 597 1.4 V OC [Volt
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DEVICE OPERATION 599 13.5.3 The Cu(
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DEVICE OPERATION 601 Table 13.5 Hig
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MANUFACTURING ISSUES 603 can well f
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MANUFACTURING ISSUES 605 P1 P1 Mo G
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MANUFACTURING ISSUES 607 Finally, f
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THE Cu(InGa)Se 2 OUTLOOK 609 active
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REFERENCES 611 With all these chall
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REFERENCES 613 81. Stolt L, Hedstr
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REFERENCES 615 168. Fahrenbruch A,
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14 Cadmium Telluride Solar Cells Br
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INTRODUCTION 619 In contrast to p/n
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CdTe PROPERTIES AND THIN-FILM FABRI
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CdTe THIN-FILM SOLAR CELLS 631 orie
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CdTe THIN-FILM SOLAR CELLS 633 14.3
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CdTe THIN-FILM SOLAR CELLS 635 CdTe
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CdTe THIN-FILM SOLAR CELLS 639 800
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CdTe THIN-FILM SOLAR CELLS 641 10
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CdTe THIN-FILM SOLAR CELLS 645 forw
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CdTe THIN-FILM SOLAR CELLS 647 30 R
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CdTe THIN-FILM SOLAR CELLS 649 The
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CdTe MODULES 651 14.4 CdTe MODULES
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THE FUTURE OF CdTe-BASED SOLAR CELL
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THE FUTURE OF CdTe-BASED SOLAR CELL
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REFERENCES 657 This chapter has sho
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REFERENCES 659 60. Wei S, Mtg. Reco
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REFERENCES 661 152. McCandless B, Q
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15 Dye-sensitized Solar Cells Kohji
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INTRODUCTION TO DYE-SENSITIZED SOLA
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DSSC FABRICATION (η = 8%) 679 alko
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DSSC FABRICATION (η = 8%) 681 15.2
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NEW DEVELOPMENTS 683 of highly effi
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NEW DEVELOPMENTS 685 HOOC COOH HOOC
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NEW DEVELOPMENTS 687 photosensitize
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NEW DEVELOPMENTS 689 of these ionic
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APPROACH TO COMMERCIALIZATION 691 1
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Institute and reference Table 15.3
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SUMMARY AND PROSPECTS 695 Chemicals
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REFERENCES 697 4. Dare-Edwards M et
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REFERENCES 699 96. Tennakone K, Kum
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16 Measurement and Characterization
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RATING PV PERFORMANCE 703 Spectral
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λ [nm] Table 16.3 AM0 standard sol
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171.5 7.01E − 1 372.5 1074 573.5
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228.5 52.940 429.5 1501 630.7 1682
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288.5 328.400 489.5 1994 689.1 1506
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RATING PV PERFORMANCE 713 The extra
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RATING PV PERFORMANCE 715 of about
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RATING PV PERFORMANCE 717 Energy [W
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RATING PV PERFORMANCE 719 16.2.4 Tr
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CURRENT VERSUS VOLTAGE MEASUREMENTS
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SPECTRAL RESPONSIVITY MEASUREMENTS
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MODULE QUALIFICATION AND CERTIFICAT
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REFERENCES 747 REFERENCES 1. Emery
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REFERENCES 749 62. Standard IEC 608
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REFERENCES 751 130. Dondero R, Zirk
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17 Photovoltaic Systems Klaus Preis
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PV POWER SYSTEM CONFIGURATION AND A
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Page 816 and 817: COMPONENTS FOR PV SYSTEMS 787 volta
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Page 826 and 827: REFERENCES 797 CL Controllable load
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Page 830 and 831: GENERAL CONCEPT OF ELECTROCHEMICAL
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Page 848: Table 18.4 Overview of the technica
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Page 879 and 880: BATTERY SYSTEMS WITH EXTERNAL STORA
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Page 889 and 890: CONCLUSION 859 This example is just
Page 891 and 892: REFERENCES 861 10. Ruddell A et al.
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Page 895 and 896: CONTROLLERS AND MONITORING SYSTEMS
Page 911 and 912: INVERTERS 881 19.2 INVERTERS 19.2.1
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INVERTERS 883 Current [A] MPP Power
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INVERTERS 885 S1 S3 DC source AC ou
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INVERTERS 887 V PV V load t 0 t 1 t
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INVERTERS 889 The resulting voltage
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INVERTERS 891 12 V 24 V 48 V 96 V 1
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INVERTERS 893 U DC voltage level U
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INVERTERS 895 100 55 Hz 50 Hz Frequ
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INVERTERS 897 S1 L C 1 C 2 AC outpu
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INVERTERS 899 Time delay Seconds Mi
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INVERTERS 901 Separated part of the
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REFERENCES 903 5. Gonzalez G, Hill
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906 ENERGY COLLECTED AND DELIVERED
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972 ECONOMIC ANALYSIS OF PV SYSTEMS
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1000 ECONOMIC ANALYSIS OF PV SYSTEM
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1002 ECONOMIC ANALYSIS OF PV SYSTEM
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22 PV in Architecture Tjerk H. Reij
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INTRODUCTION 1007 Figure 22.2 Integ
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PV IN ARCHITECTURE 1009 Figure 22.4
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PV IN ARCHITECTURE 1013 Heat load a
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PV IN ARCHITECTURE 1015 • aesthet
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BIPV BASICS 1027 22.3.1.2 Categorie
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BIPV BASICS 1029 Figure 22.34 Alute
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BIPV BASICS 1031 Figure 22.38 Solgr
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BIPV BASICS 1033 Figure 22.42 Canop
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BIPV BASICS 1035 cooling as possibl
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STEPS IN THE DESIGN PROCESS WITH PV
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STEPS IN THE DESIGN PROCESS WITH PV
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REFERENCES 1041 REFERENCES 1. Reije
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23 Photovoltaics and Development Jo
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ELECTRICITY AND DEVELOPMENT 1045 pe
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BREAKING THE CHAINS OF UNDERDEVELOP
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THE PV ALTERNATIVE 1049 was too exp
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THE PV ALTERNATIVE 1051 Basic light
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THE PV ALTERNATIVE 1053 (for a deta
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THE PV ALTERNATIVE 1055 issued by t
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THE PV ALTERNATIVE 1057 Needless to
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THE PV ALTERNATIVE 1059 exports bal
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FOUR EXAMPLES OF PV RURAL ELECTRIFI
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REFERENCES 1069 standard of living
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REFERENCES 1071 36. Martinot E et a
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1074 FINANCING PV GROWTH 1995 : The
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1076 FINANCING PV GROWTH 24.2.3 Cap
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1078 FINANCING PV GROWTH can range
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1080 FINANCING PV GROWTH 24.4.2 Typ
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1082 FINANCING PV GROWTH 24.4.5 Exa
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1084 FINANCING PV GROWTH Such PV sy
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1086 FINANCING PV GROWTH approved a
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1088 FINANCING PV GROWTH Ghana: ren
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1090 FINANCING PV GROWTH Table 24.3
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1092 FINANCING PV GROWTH with succe
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1094 FINANCING PV GROWTH 24.8.2 Dir
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1096 FINANCING PV GROWTH using a 40
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1098 FINANCING PV GROWTH Current do
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1100 FINANCING PV GROWTH 3503 RE Ut
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1102 FINANCING PV GROWTH was capita
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1104 FINANCING PV GROWTH Policy and
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1106 FINANCING PV GROWTH E-mail: We
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1108 FINANCING PV GROWTH Triodos Ba
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1110 FINANCING PV GROWTH Contact: G
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1112 FINANCING PV GROWTH Phone: 94
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1114 FINANCING PV GROWTH Fax: 91 11
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Index Index Terms Links A a-Si see
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Index Terms Links III-V multijuncti
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Index Terms Links module temperatur
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Index Terms Links CdTe modules 651
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Index Terms Links early demonstrati
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Index Terms Links crystalline silic
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Index Terms Links daily irradiation
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Index Terms Links module fabricatio
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Index Terms Links electricity produ
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Index Terms Links extensive variabl
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Index Terms Links lattice matching
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Index Terms Links heat load and day
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Index Terms Links intensive variabl
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Index Terms Links chemistry 827 828
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Index Terms Links Meteosat weather
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Index Terms Links thin-film silicon
Page 1175 and 1176:
Index Terms Links energy collection
Page 1177 and 1178:
Index Terms Links powerguard flat-r
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Index Terms Links rooftop PV genera
Page 1181 and 1182:
Index Terms Links Siemens Solar Bor
Page 1183 and 1184:
Index Terms Links Sofrel flat-roof
Page 1185 and 1186:
Index Terms Links Solar Terrestrial
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Index Terms Links SunPower Corporat
Page 1189 and 1190:
Index Terms Links surface texture 3
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Index Terms Links waferin 223 224 2
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