On-Sun Comparison of GaInP2/GaAs Tandem Cells with Top-Cell Thickness Varied
This study compares the on-sun performance of a set of GaInP2/GaAs tandem cells with different GaInP2 top-cell thicknesses. Because high-efficiency III-V cells are best suited to concentrating photovoltaic (CPV) applications, the cells were mounted on a two-axis tracker with the incident sunlight collimated to exclude all except the direct beam. Current-voltage (I-V) curves were taken throughout the course of several days, along with the direct solar spectrum. Our two major conclusions are: (1) GaInP2/GaAs tandem cells designed for an ''air mass 1.5 global'' (AM 1.5G) or a ''low aerosol optical depth'' (Low AOD) spectrum perform the best, and (2) a simple device model using the measured direct spectra as an input gives the same result. These results are equally valid for GaInP2/GaAs/Ge triple-junction cells.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC36-99-GO10337
- OSTI ID:
- 860697
- Report Number(s):
- NREL/CP-520-37022; TRN: US200524%%248
- Resource Relation:
- Related Information: Presented at the 2004 DOE Solar Energy Technologies Program Review Meeting, 25-28 October 2004, Denver, Colorado. Also included in the proceedings available on CD-ROM (DOE/GO-102005-2067; NREL/CD-520-37140)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
AEROSOLS
AIR
PERFORMANCE
SPECTRA
THICKNESS
SOLAR ENERGY
PV
ON-SUN
TANDEM CELLS
SOLAR CELLS
TOP-CELL THICKNESS
HIGH-EFFICIENCY III-V
TWO-AXIS TRACKER
CURRENT-VOLTAGE (I-V)
AIR MASS 1.5 GLOBAL (AM 1.5G)
LOW AEROSOL OPTICAL DEPTH (LOW AOD)
DEVICE MODEL
TRIPLE-JUNCTION
Solar Energy - Photovoltaics