119th General Meeting of the KCS

Type Poster Presentation
Area 재료화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code MAT.P-357
Subject Cs2SnI6-based Hole Transporting System Generating High Photocurrent Density for Dye-sensitized Solar Cells
Authors 신현오, 권태혁1,*
UNIST 화학과, Korea
1UNIST 친환경에너지 공학부, Korea
Abstract Pb-based perovskite has attracted a great attention as the multifunctional materials in next generation solar cells because of great light harvesting ability, ambipolar conductance, etc. However, despite of their brilliant properties, the toxicity of centered atom has limited their application to broad field and triggered the researches on Pb-free perovskite. As the representative of the Pb-free perovskite, Cs2SnI6 perovskite is stable in ambient conditions and showed the great ability as the hole transport material in the dye-sensitized solar cells (DSSCs). In this work, we suggest the efficient hole transporting system(HTS) that is consisted of Cs2SnI6 perovskite and ionic liquid (DMPII) in succinonitrile. We also investigate their compatibility with various sensitizers in terms of thermodynamic energy level. In such Cs2SnI6-based HTS, Cs2SnI6 showed faster charge transfer rate compared with general iodine couples and DMPII compensated the high viscosity of succinonitrile medium. Due to their complementary cooperation, BT-T2 DSSC based on Cs2SnI6-based HTS generated much higher photocurrent density than conventional liquid-type DSCs with iodine. Consequently, we achieved 5.5% of power conversion efficiency with only 1.8-μm thin TiO2 film, which was higher than the best one of liquid-type BT-T2 DSSC. We studied the conductivity and charge transfer resistance in Cs2SnI6-based HTS using several electrochemical analyses. Moreover, from TCSPC and IMPS&VS analysis, we revealed Cs2SnI6-based HTS showed higher regeneration efficiency and charge collection efficiency compared with iodine electrolyte. This work demonstrated the excellence of the Pb-free perovskite compared with iodine electrolyte, contributing the growth of further researches on Pb-free perovskite and DSSCs.
E-mail haeroshin@gmail.com