期刊
CHEMSUSCHEM
卷 6, 期 3, 页码 481-486出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201200677
关键词
copper; gallium; indium; selenium; thin films
资金
- Robert A. Welch Foundation [F-1464]
- Air Force Research Laboratory [FA-8650-07-2-5061]
- NSF Industry/University Cooperative Research Center on Next Generation Photovoltaics [IIP-1134849]
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1134849] Funding Source: National Science Foundation
Thin-film photovoltaic devices (PVs) were prepared by selenization using oleylamine-capped Cu(In,Ga)Se2 (CIGS) nanocrystals sintered at a high temperature (>500 degrees C) under Se vapor. The device performance varied significantly with [Ga]/[In+Ga] content in the nanocrystals. The highest power conversion efficiency (PCE) observed in the devices studied was 5.1% under air mass 1.5global (AM1.5G) illumination, obtained with [Ga]/[In+Ga]=0.32. The variation in PCE with composition is partly a result of bandgap tuning and optimization, but the main influence of nanocrystal composition appeared to be on the quality of the sintered films. The [Cu]/[In+Ga] content was found to be strongly influenced by the [Ga]/[In+Ga] concentration, which appears to be correlated with the morphology of the sintered film. For this reason, only small changes in the [Ga]/[In+Ga] content resulted in significant variations in device efficiency.
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