期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 94, 期 10, 页码 1730-1733出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2010.05.036
关键词
Thin film solar cell; CuInS2; Intermediate band; Titanium; Titanium oxide
资金
- European Commission [211640]
Titanium has been incorporated in CuInS2 thin films and devices by diffusion of Ti from the substrate during the CuInS2 co-evaporation growth process. The CuInS2 crystal structure is unaffected but the grain size is reduced compared to Ti-free reference samples. X-ray photoelectron spectroscopy shows the presence of TiO2 at the front of the absorber layer, which appears at the heterojunction interface of the completed CuInS2/TiO2/CdS/ZnO solar cells. Low temperature photoluminescence spectra show no additional transitions that could be assigned to Ti-based impurity defect levels. Ti-containing cells show conversion efficiencies higher than the Ti-free reference cells due to higher open-circuit voltage (efficiency 11%, V-OC=731 mV). No reduction in short circuit current is detected, indicating that the titanium does not introduce additional bulk recombination. Temperature-dependent current-voltage measurements indicate a reduced interface recombination for cells containing Ti, which is attributed to the TiO2 interlayer detected by X-ray photoelectron spectroscopy. (C) 2010 Elsevier B.V. All rights reserved.
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