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J. Korean Ceram. Soc. > Volume 48(4); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(4): 328.
doi: https://doi.org/10.4191/kcers.2011.48.4.328
고온 및 고온고습 환경 내에서 ZnO:Al 투명전극의 열화가 CIGS 박막형 태양전지의 성능 저하에 미치는 영향
김도완, 이동원1, 이희수, 김승태2, 박지홍2, 김용남1
부산대학교 재료공학부
1한국산업기술시험원 재료평가센터
2LG이노텍(주) Solar Cell Lab
Effect of Degraded Al-doped ZnO Thin Films on Performance Deterioration of CIGS Solar Cell
Do-Wan Kim, Dong-Won Lee1, Hee-Soo Lee, Seung-Tae Kim2, Chi-Hong Park2, Yong-Nam Kim1
School of Materials Science and Engineering, Pusan National University
1Material Testing Center, Korea Testing Laboratory
2Solar Cell Laboratory, LG Innotek Co., Ltd.
The influence of Al-doped ZnO (AZO) thin films degraded under high temperature and damp heat on the performance deterioration of Cu(In,Ga)$Se_2$ (CIGS) solar cells was investigated. CIGS solar cells with AZO/CdS/CIGS/Mo structure were prepared on glass substrate and exposed to high temperature ($85^{circ}C$) and damp heat ($85^{circ}C$/85% RH) for 1000 h. As-prepared CIGS solar cells had 64.91% in fill factor (FF) and 12.04% in conversion efficiency. After exposed to high temperature, CIGS solar cell had 59.14% in FF and 9.78% in efficiency, while after exposed to damp heat, it had 54.00% in FF and 8.78% in efficiency. AZO thin films in the deteriorated CIGS solar cells showed increases in resistivity up to 3.1 times and 4.4 times compared to their initial resistivity after 1000 h of high temperature and damp heat exposure, respectively. These results can be explained by the decreases in carrier concentration and mobility due to diffusion or adsorption of oxygen and moisture in AZO thin films. It can be inferred that decreases in FF and conversion efficiency were caused by an increase in series resistance, which resulted from an increase in resistivity of AZO thin films degraded under high temperature and damp heat.
Key words: CIGS thin film solar cell, Al-doped ZnO, High temperature, Damp heat, Degradation
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