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Flexible Solar Cells with a Cu(In,Ga)Se2 Absorber Grown by Using a Se Thermal Cracker on a Polyimide Substrate
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- Authors
- Soo-Jeong Park, Yong-Duck Chung, Woo-Jung Lee, Dae-Hyung Cho, Jae-Hyung Wi, Won-Seok Han, Yousuk Cho, Jong-man Yoon
- Issue Date
- 2015-01
- Citation
- Journal of the Korean Physical Society, v.66, no.1, pp.76-81
- ISSN
- 0374-4884
- Publisher
- 한국물리학회
- Language
- English
- Type
- Journal Article
- Abstract
- A polyimide substrate was used for the fabrication of flexible Cu(In,Ga)Se2 (CIGS) thin-film solar cells. To deposit a stable Mo layer on a flexible substrate, we measured the residual stress in the polyimide film after the deposition of a Mo layer by varying the process pressure. A CIGS absorber was deposited on a Mo layer at a growth temperature below 500?꼦 by using a Se thermal cracker and various cracking zone temperatures (TC) to improve the reactivity of Se due to the low process temperature. To investigate the effect of Na on the efficiency of a flexible CIGS solar cell, we deposited a Mo:Na layer as a source of Na between the Mo layer and the polyimide substrate. In case of the flexible CIGS solar cell fabricated under the condition of a TC of 800?꼦 with a Mo:Na layer, the highest cell efficiency was achieved at 10.76% without an anti-reflection coating, which is significantly increased by 4% compared to the efficiency of a solar cell without the Mo:Na layer.
- KSP Keywords
- CIGS absorber, Cell Efficiency, Flexible CIGS solar cell, Flexible substrate, Polyimide substrate, Process pressure, Process temperature, Residual Stress, Thin film solar cells, antireflection coating, flexible solar cells