Title :
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
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 Ga0.35In0.85P/Ga0.83 In0.17As 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; Ga0.35In0.85P-Ga0.83In0.17 As; GaInP-GaAs-Ge; I-V characterization; NREL; Spectrolab; flash simulator; multijunction concentrators; one-sun efficiency; quantum efficiency determination; spectral correction; tandem Ga0.35In0.85P/Ga0.83In 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;
Conference_Titel :
Photovoltaic Specialists Conference, 2000. Conference Record of the Twenty-Eighth IEEE
Conference_Location :
Anchorage, AK
Print_ISBN :
0-7803-5772-8
DOI :
10.1109/PVSC.2000.916085
