Due to its favorable optical properties, Cu2SnS3 (CTS) is a promising material for thin film solar cells. Doping, which modifies the absorber properties, is one way to improve the conversion efficiency of CTS solar cells. In this work, CTS solar cells with selenium doping were fabricated on a flexible substrate using sputtering method and the effect of doping on the properties of CTS solar cells was investigated. In XRD analysis, a shift in the CTS peaks can be observed due to the doped selenium. XRF analysis confirmed the different ratios of Cu/Sn and (S+Se)/(Cu+Sn) depending on the amount of selenium doping. Selenium doping can help to lower the chemical potential of sulfur. This effectively reduces the point defects of CTS thin films. Overall improved electrical properties were observed in the CTS solar cell with a small amount of selenium doping, and a notable conversion efficiency of 1.02 % was achieved in the CTS solar cell doped with 1 at% of selenium.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
4. 결 론
References

• 이인재(전남대학교 신소재공학부) | In Jae Lee (Department of Materials Science and Engineering, Chonnam National University)
• 조은애(전남대학교 신소재공학부) | Eunae Jo (Department of Materials Science and Engineering, Chonnam National University)
• 장준성(전남대학교 신소재공학부) | Jun Sung Jang (Department of Materials Science and Engineering, Chonnam National University)
• 이병훈(전남대학교 신소재공학부) | Byeong Hoon Lee (Department of Materials Science and Engineering, Chonnam National University)
• 이동민(전남대학교 신소재공학부) | Dong Min Lee (Department of Materials Science and Engineering, Chonnam National University)
• 강창현(전남대학교 광공학협동과정) | Chang Hyun Kang (Interdisciplinary Program for Photonic Engineering, Chonnam National University)
• 문종하(전남대학교 신소재공학부, 전남대학교 광공학협동과정) | Jong Ha Moon (Department of Materials Science and Engineering, Chonnam National University/2Interdisciplinary Program for Photonic Engineering, Chonnam National University) Corresponding author