Procedures for evaluating multijunction concentrators

Author

Emery, K. ; Meusel, M. ; Beckert, R. ; Dimroth, F. ; Bett, A. ; Warta, W.

Author_Institution

Nat. Renewable Energy Lab., Golden, CO, USA

fYear

2000

fDate

2000

Firstpage

1126

Lastpage

1130

Abstract

Procedures at NREL and Fraunhofer ISE for evaluating multijunction cells are detailed with a triple-junction GaInP/GaAs/Ge concentrator cell designed and grown at Spectrolab and processed at NREL, and a tandem Fraunhofer ISE Ga_0.35In_0.85P/Ga_0.83In_0.17As cell as examples. The one-sun efficiency and I _sc for the triple-junction device measured at Fraunhofer ISE and NREL agreed within 0.2%, well below the ±6% uncertainty estimated by NREL. The procedures for determining the one-sun characteristics involve determining the quantum efficiency and using it for spectral correction during the I-V characterization. The characteristics under concentration are evaluated with a flash simulator

Keywords

elemental semiconductors; gallium arsenide; gallium compounds; germanium; indium compounds; p-n heterojunctions; solar cells; solar energy concentrators; Fraunhofer ISE; Ga_0.35In_0.85P-Ga_0.83In_0.17As; GaInP-GaAs-Ge; I-V characterization; NREL; Spectrolab; flash simulator; multijunction concentrators; one-sun efficiency; quantum efficiency determination; spectral correction; tandem Ga_0.35In_0.85P/Ga_0.83In _0.17As cell; triple-junction GaInP/GaAs/Ge concentrator cell; triple-junction device; Amorphous silicon; Current measurement; Gallium arsenide; Light sources; Linearity; Measurement standards; Photoconductivity; Renewable energy resources; Solar energy; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Photovoltaic Specialists Conference, 2000. Conference Record of the Twenty-Eighth IEEE

Conference_Location

Anchorage, AK

ISSN

0160-8371

Print_ISBN

0-7803-5772-8

Type

conf

DOI

10.1109/PVSC.2000.916085

Filename

916085