Daily Fill Factor Variation as a Diagnostic Probe of Multijunction Concentrator Systems During Outdoor Operation

William McMahon

Daily Fill Factor Variation as a Diagnostic Probe of Multijunction Concentrator Systems During Outdoor Operation

Chemistry and Nanoscience

Research output: Contribution to conference › Paper

Abstract

The work presented here is for GaInP2/GaAs tandem cells, but the conclusions are equally valid for GaInP2/GaAs/Ge triple-junction cells. Optimizing a concentrator system which uses multijunction solar cells is challenging because: (a) the conditions are variable, so the solar cells rarely operate under optimal conditions and (b) the conditions are not controlled, so any design problems aredifficult to characterize. Any change in the spectral content of direct-beam sunlight as it passes through the concentrator optics is of particular interest, as it can reduce the performance of multijunction cells and is difficult to characterize.

Original language	American English
Number of pages	8
State	Published - 2007
Event	High and Low Concentration for Solar Electric Applications II: SPIE Optics and Photonics Conference - San Diego, California Duration: 26 Aug 2007 → 30 Aug 2007

Conference

Conference	High and Low Concentration for Solar Electric Applications II: SPIE Optics and Photonics Conference
City	San Diego, California
Period	26/08/07 → 30/08/07

NREL Publication Number

NREL/CP-520-41985

Keywords

concentrator modules
current-matching
fill factor
multi-junction solar cell
PV

Cite this

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title = "Daily Fill Factor Variation as a Diagnostic Probe of Multijunction Concentrator Systems During Outdoor Operation",

abstract = "The work presented here is for GaInP2/GaAs tandem cells, but the conclusions are equally valid for GaInP2/GaAs/Ge triple-junction cells. Optimizing a concentrator system which uses multijunction solar cells is challenging because: (a) the conditions are variable, so the solar cells rarely operate under optimal conditions and (b) the conditions are not controlled, so any design problems aredifficult to characterize. Any change in the spectral content of direct-beam sunlight as it passes through the concentrator optics is of particular interest, as it can reduce the performance of multijunction cells and is difficult to characterize.",

keywords = "concentrator modules, current-matching, fill factor, multi-junction solar cell, PV",

author = "William McMahon",

year = "2007",

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N2 - The work presented here is for GaInP2/GaAs tandem cells, but the conclusions are equally valid for GaInP2/GaAs/Ge triple-junction cells. Optimizing a concentrator system which uses multijunction solar cells is challenging because: (a) the conditions are variable, so the solar cells rarely operate under optimal conditions and (b) the conditions are not controlled, so any design problems aredifficult to characterize. Any change in the spectral content of direct-beam sunlight as it passes through the concentrator optics is of particular interest, as it can reduce the performance of multijunction cells and is difficult to characterize.

AB - The work presented here is for GaInP2/GaAs tandem cells, but the conclusions are equally valid for GaInP2/GaAs/Ge triple-junction cells. Optimizing a concentrator system which uses multijunction solar cells is challenging because: (a) the conditions are variable, so the solar cells rarely operate under optimal conditions and (b) the conditions are not controlled, so any design problems aredifficult to characterize. Any change in the spectral content of direct-beam sunlight as it passes through the concentrator optics is of particular interest, as it can reduce the performance of multijunction cells and is difficult to characterize.

KW - concentrator modules

KW - current-matching

KW - fill factor

KW - multi-junction solar cell

KW - PV

M3 - Paper

T2 - High and Low Concentration for Solar Electric Applications II: SPIE Optics and Photonics Conference

Y2 - 26 August 2007 through 30 August 2007

ER -

Daily Fill Factor Variation as a Diagnostic Probe of Multijunction Concentrator Systems During Outdoor Operation

Abstract

Conference

NREL Publication Number

Keywords

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Cite this