| 학회 |
한국재료학회 |
| 학술대회 |
2017년 가을 (11/15 ~ 11/17, 경주 현대호텔) |
| 권호 |
23권 2호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Optimaization of CdS buffer layer for high efficiency Cu2ZnSn(S,Se)4 thin film solar cells |
| 초록 |
Earth-abundant kesterite, copper-zinc-tin-sulfo-selenide (CZTSSe) compound is an attractive absorber material for thin-film solar cells (TFSCs). However, the open circuit voltage deficit (Voc-deficit) resulting from high recombination rate at buffer/absorber interface is one of the major challenges that must be over come to improve the performance of kesterite-based TFSCs. Herein, we have correlated the performances of Cu2ZnSn(S,Se)4 (CZTSSe) based solar cell as a function of chemically bath deposited CdS buffer layer thickness. By tuning the CdS buffer layer thickness from 22 to 48nm, the conversion efficiency of CZTSSe thin film solar cells were improved from 8 to ~10%. The ideality factors resulted from diode parameters showed improved performance with the CdS layer thickness. The devices fabricated with thin buffer layers exhibited slightly higher open circuit voltages indicating less interfacial recombination at the buffer/absorber interface. The results indicated that the device parameters and hence the performances are strongly dependent on the CdS buffer thickness. Solar cells with thicker CdS buffer layers showed increase in series resistance (Rs), shunt conductance (Gsh) and reverse saturation current (I0), as well as Voc-deficit in the kesterite solar cells. The best conversion efficiencies of 9.87 and 5.5% we reachieved with a 22 nm and 64 nm thick CdS buffer layers deposited at 60 and 80oC, respectively. The study shows that further improvement of interface between absorber and buffer layer may reduce the open circuit voltage deficit which in turn improve the conversion efficiency of CZTSSe TFSCs. |
| 저자 |
Myeng Gil Gang1, Jin Hyeok Kim2
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| 소속 |
1Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, 2Chonnam National Univ. |
| 키워드 |
<P>CZTSSe; CdS; Chemical bath deposition; Sulfo-selenization; Sputtering</P>
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| E-Mail |
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