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456 PHOTOVOLTAIC CONCENTRATORS 11.2.3 Types of Tracking Point-focus optics generally require that the concentrator track about two axes so that it is always pointed at the sun, and the focused light falls on the cell. From a mechanical standpoint, two-axis tracking is more complex than one-axis tracking; however, pointfocus systems are also capable of higher concentration ratio and hence lower cell cost. Line-focus reflective troughs need only track along one axis such that the image falls along the focus line. Linear Fresnel concentrators suffer severe optical aberrations when the sun is not perpendicular to the lens’ translation axis. (Basically the focal length decreases as the sun’s angle moves from normal to the lens.) This generally limits linear Fresnel systems to two-axis tracking. Modest geometric concentration ratios of around 10 are possible, however, if the lens tracks on a polar axis, which limits the sun’s angle off normal to 23 ◦ maximum [4]. There are three common types of two-axis trackers as shown in Figure 11.3. The pedestal form uses a central pedestal supporting a flat tracking array structure. Tracking is usually effected by a gearbox, which tracks the array along a vertical axis (the azimuth rotation) and along a horizontal axis (the elevation rotation). An advantage of this configuration is the simplicity of installation (basically drilling a single hole, inserting the pedestal into the hole, back-filling with concrete, and placing the array and gear drive on the pedestal). A disadvantage is that wind loads are translated to the central gear drive in the form of very large torque, necessitating large capacity gears. Another form of two-axis tracking is the roll-tilt structure of Figure 11.3(b). Here wind loads on drive components are considerably reduced; however, there are now more rotating bearings and linkages required. Obtaining the required stiffness along the roll axis can necessitate a rather large-section horizontal support member. The structure also requires multiple foundations that must be aligned, complicating installation. The roll axis is most usually placed in a north–south direction, as this minimizes shadowing by adjacent modules along the roll axis. Another roll-tilt configuration uses a box frame with the Fresnel modules pivoted between the upper and the lower frame. This is shown in Figure 11.3(c). The final common configuration is the turntable of Figure 11.3(d). This structure provides for the lowest profile and lowest wind loading, and can use rather small drive components and support members. On the other hand, it presents the most complex installation scenario. One-axis trackers are generally configured with either a horizontal axis of rotation or a polar axis of rotation as shown in Figure 11.4. A horizontal axis provides for lower profile and larger area per tracking structure, as compared to the polar-axis approach. Horizontal-axis trackers usually use reflective troughs. It can be seen that the sun can be at a fairly large angle to the array, especially in the winter with a north–south axis or early and late in the day with an east–west axis. This causes the image to move a distance down the focus axis and can result in significant end losses and image broadening. The polar-axis configuration, on the other hand, gives higher intercepted annual energy and limits the incoming sun angle to a maximum of 23 ◦ from the plane of the concentrator. The simplicity and low profile of the horizontal-axis configuration makes it the more common choice over the polar-axis approach. 11.2.4 Static Concentrators In principle, it is possible to provide some concentration without any tracking at all. The reasons for this are severalfold. First, the sun appears in only a restricted portion of the
BASIC TYPES OF CONCENTRATORS 457 sky. For example, it will never be due north at zero-degree elevation to the horizon. This means that the ability of a flat-plate module to receive light from every direction is somewhat wasted. It can be seen in the section on concentrator optics that the maximum attainable concentration is related to the angular regions where the system can accept light in such a manner that if it can accept a fraction f of the diffuse light falling on it from all directions, then the maximum possible concentration is 1/f . This relation is further enhanced by a factor of n 2 if the cell is immersed in a dielectric of index of refraction n. Since it is possible to build cells that can receive light from both sides, so-called bifacial cells, another factor of 2 is available by using bifacial cells. The sum result of these Front side of array Tracking array of Fresnel modules Pedestal Azimuth axis Back side of array Elevation axis Figure 11.3 Two-axis tracking configurations. (a) Two-axis tracker with elevation and azimuth tracking mounted on a pedestal. (b) Roll-tilt tracking arrangement using central torque tube. (c) Roll-tilt tracking arrangement using box frame. (d) Turntable two-axis tracker (a)
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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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Page 437 and 438: THE HISTORY OF SPACE SOLAR CELLS 41
Page 439 and 440: THE CHALLENGE FOR SPACE SOLAR CELLS
Page 447 and 448: SILICON SOLAR CELLS 425 Figure 10.7
Page 449 and 450: III-V SOLAR CELLS 427 n+-GaAs n-AlI
Page 451 and 452: III-V SOLAR CELLS 429 missions with
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Page 457 and 458: SPACE SOLAR ARRAYS 435 Figure 10.13
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Page 461 and 462: SPACE SOLAR ARRAYS 439 0.31 Astrono
Page 463 and 464: FUTURE CELL AND ARRAY POSSIBILITIES
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Page 467 and 468: POWER SYSTEM FIGURES OF MERIT 445 A
Page 469 and 470: REFERENCES 447 8. Statler R, Curtin
Page 471 and 472: 11 Photovoltaic Concentrators Richa
Page 473 and 474: INTRODUCTION 451 markets most often
Page 475 and 476: BASIC TYPES OF CONCENTRATORS 453 ha
Page 477: BASIC TYPES OF CONCENTRATORS 455 is
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Page 483 and 484: HISTORICAL OVERVIEW 461 thereafter.
Page 485 and 486: HISTORICAL OVERVIEW 463 Figure 11.6
Page 487 and 488: HISTORICAL OVERVIEW 465 production
Page 489 and 490: HISTORICAL OVERVIEW 467 Figure 11.1
Page 491 and 492: HISTORICAL OVERVIEW 469 n + bussbar
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Page 495 and 496: HISTORICAL OVERVIEW 473 Solar radia
Page 497 and 498: OPTICS OF CONCENTRATORS 475 q max,
Page 499 and 500: OPTICS OF CONCENTRATORS 477 If r 1
Page 501 and 502: OPTICS OF CONCENTRATORS 479 r i Med
Page 503 and 504: OPTICS OF CONCENTRATORS 481 When θ
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Page 509 and 510: OPTICS OF CONCENTRATORS 487 For lar
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Page 513 and 514: OPTICS OF CONCENTRATORS 491 gleaned
Page 515 and 516: OPTICS OF CONCENTRATORS 493 Solar c
Page 517 and 518: CURRENT CONCENTRATOR ACTIVITIES 495
Page 523 and 524: REFERENCES 501 11. Boes E, “Photo
Page 525 and 526: REFERENCES 503 60. Uematsu T et al.
Page 527 and 528: 506 AMORPHOUS SILICON-BASED SOLAR C
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508 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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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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