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Conference Paper Photoreflectance Characteristics and Photovoltaic Performance of CBD-CdS/Cu(In, Ga)Se 2 Thin-Film Solar Cells
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Authors
H. W. Choi, Y. D. Chung, D. H. Cho, B. J. Ahn, J. H. Song, K. S. Lee, J. Kim
Issue Date
2011-06
Citation
Photovoltaic Specialists Conference (PVSC) 2011, pp.1259-1261
Publisher
IEEE
Language
English
Type
Conference Paper
DOI
https://dx.doi.org/10.1109/PVSC.2011.6186186
Abstract
We have investigated the photoreflectance characteristics and the photovoltaic performance of Cu(In, Ga)Se 2 (CIGS) thin-film solar cells that have CdS layers prepared by chemical bath deposition (CBD). The CdS was deposited on CIGS by three different conditions. (I) CdSO 4 0.014 M, thiourea 0.014 M, NH 4OH(30%) 60 ml, (II) CdSO 4 0.0015 M, thiourea 0.074 M, NH 4OH(30%) 56 ml, and (III) CdSO 4 0.0015 M, thiourea 0.05 M, NH 4OH(30%) 80 ml. The efficiencies of the solar cells fabricated in processes I, II, and III were 12.17 %, 14.47 %, and 14.97 %, respectively. Quantum efficiency spectra of the solar cells in the region of the CdS band gap showed consistent results with photoreflectance observations. The photoreflectance spectra of the solar cells indicate that different states were formed in CdS depending on the conditions of CBD processes. © 2011 IEEE.
KSP Keywords
CdSO 4, Chemical bath deposition(CBD), Different conditions, Thin film solar cells, band gap, photovoltaic performance, quantum efficiency(QE), thin film(TF)