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644 CADMIUM TELLURIDE SOLAR CELLS −4.0 −4.5 −5.0 CdTe Fermi level Energy [eV] −5.5 −6.0 −6.5 −7.0 −7.5 CdS N a = 3 × 10 13 N a = 1 × 10 15 N a = 1 × 10 17 −8.0 0 0.5 1 1.5 2 x [µm] Figure 14.20 CdTe/CdS junction band diagrams at V = 0 for three values of CdTe acceptor density and a back-contact barrier = 0.3 eV contact have generally involved the use of other tellurides, such as ZnTe:N [158] and Sb 2 Te 3 [159], that can make reasonable contact to the CdTe and form only modest barriers with an appropriate metal. To date, however, contacts demonstrably free of Cu have not shown significant promise. One consequence of a back-contact barrier, and the value of keeping it small, can be seen in the band diagrams of Figure 14.20 calculated by Alan Fahrenbruch for a2-µm-thick CdTe layer [160]. The back contact is essentially a second diode with opposite polarity and smaller barrier than the primary junction. For a thick absorber, or one with reasonably large carrier density (solid curve), the bands are flat over most of the absorber thickness, the primary junction effectively blocks modest forward currents, and the back barrier has only a minor effect on the current–voltage curves. For carrier densities more typical of CdTe (between dashed and dotted lines), however, the depletion widths of the primary and back-contact diodes overlap. The effective reduction in the barrier for electrons means that forward current can flow more easily, reducing the opencircuit voltage. 14.3.5 Solar Cell Characterization Considerable information about the electrical properties of CdTe solar cells has been deduced from straightforward measurements of current versus voltage (J –V ), quantum efficiency (QE) and capacitance versus frequency (C –f ) and voltage (C –V ). More detailed information can be obtained from the temperature dependence or the time evolution of these curves. The J –V curve (Figure 14.2) for the record-efficiency cell follows a standard diode equation with additional factors included to take account of circuit resistance and
CdTe THIN-FILM SOLAR CELLS 645 forward-current mechanisms other than thermionic emission. J = J 0 exp[(V − JR)/AkT] − J SC + V/r (14.1) For the illuminated J –V curves of the record-efficiency CdTe cell, the prefactor J 0 is 1 × 10 −9 A/cm 2 , the series resistance R is 1.8 -cm 2 , the diode quality factor A is 1.9, and the shunt resistance r is 2500 -cm 2 . The values for R and A were found using the technique described in Reference [161]. The forward-current (J + J SC ) data for the record-efficiency CdTe cell is replotted in Figure 14.21 using a logarithmic scale, and the analogous data of a high-efficiency GaAs cell [162] is shown for comparison. Since CdTe and GaAs have nearly the same band gap, they should ideally have the same lower limit to J 0 and same V OC and J –V characteristic, if they were both limited by band-to-band recombination. Both curves have had small corrections for series and shunt resistances (R and r). Since the absorber materials have similar band gaps, the CdTe and GaAs cells should have similar J –V curves. The V OC difference shown, however, is nearly 200 mV. At maximum power (MP), the voltage difference is larger yet, approaching 300 mV, because the CdTe A-factor is 1.9 compared to 1.0 for the GaAs. The physical difference is due to the additional recombination-current paths for the CdTe junction. This excess forward current for the CdTe cell is roughly two orders of magnitude greater than that of the GaAs cell under normal operating conditions. The implication is that there is considerable room for improvement of V OC in CdTe cells through reduction in such recombination. Referring to the band diagrams in Figure 14.20, it is apparent that for sufficiently high density of midgap states, low doping levels in CdTe will enhance recombination current. Further, low doping levels and the resulting field profiles are expected to reduce minority transport, resulting in more pronounced voltage-dependent collection, reducing J MP . 100 10 Excess recombination current CdTe V OC J + J SC −V/r [mA/cm 2 ] 1 V MP GaAs 0.1 0.7 0.8 0.9 V−JR [V] 1.0 1.1 Figure 14.21 Comparison of high-efficiency CdTe and GaAs-illuminated J –V data on a log plot, corrected for resistive effects
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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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Page 639 and 640: INTRODUCTION 619 In contrast to p/n
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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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COMPONENTS FOR PV SYSTEMS 785 NASA
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COMPONENTS FOR PV SYSTEMS 787 volta
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COMPONENTS FOR PV SYSTEMS 789 well
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COMPONENTS FOR PV SYSTEMS 791 A sig
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COMPONENTS FOR PV SYSTEMS 793 In st
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FUTURE DEVELOPMENTS IN PHOTOVOLTAIC
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REFERENCES 797 CL Controllable load
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18 Electrochemical Storage for Phot
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GENERAL CONCEPT OF ELECTROCHEMICAL
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TYPICAL OPERATION CONDITIONS OF BAT
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TYPICAL OPERATION CONDITIONS OF BAT
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Table 18.4 Overview of the technica
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INVESTMENT AND LIFETIME COST CONSID
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CONCLUSION 859 This example is just
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REFERENCES 861 10. Ruddell A et al.
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19 Power Conditioning for Photovolt
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CONTROLLERS AND MONITORING SYSTEMS
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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
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Index Terms Links energy collection
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Index Terms Links powerguard flat-r
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Index Terms Links rooftop PV genera
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Index Terms Links Siemens Solar Bor
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Index Terms Links Sofrel flat-roof
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Index Terms Links Solar Terrestrial
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Index Terms Links SunPower Corporat
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Index Terms Links surface texture 3
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Index Terms Links waferin 223 224 2
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