Perovskite Solar Cell Using Isonicotinic Acid as a Gap-Filling Self-Assembled Monolayer with High Photovoltaic Performance and Light Stability

• DOI: 10.1021/acsami.3c05215
• Publication Date: 2023-07-07T09:56:08Z
• Authors: Takeyuki Sekimoto; Teruaki Yamamoto; Fumito Takeno; Ryosuke Nishikubo; Maki Hiraoka; Ryusuke Uchida; Toru Nakamura; Kenji Kawano; Akinori Saeki; Yukihiro Kaneko; Taisuke Matsui
• Keywords: Isonicotinic acid; Perovskite solar cell

High photovoltaic performance and light stability are required for the practical outdoor use of lead-halide perovskite solar cells. To improve cells, it is effective to introduce a self-assembled monolayer (SAM) between carrier transport layer layer. Several alternative approaches in their molecular design combination with multiple SAMs support high conversion efficiency (PCE). Herein, we report new structure improving both PCE stability, which surface an electron (ETL) was modified by combining fullerene-functionalized (C60SAM) suitable gap-filling (GFSAM). Small-sized GFSAMs can enter gap space C60SAM terminate unterminated sites on ETL surface. The best GFSAM this study formed using isonicotinic acid solution. After test 68 h at 50 °C under 1 sun illumination, cell showed 18.68% retention rate over 99%. Moreover, following exposure six months, cells exhibited almost unchanged PCE. From valence band spectra ETLs obtained hard X-ray photoelectron spectroscopy, confirmed decrease offset ETL/perovskite interface owing additional treatment C60SAM-modified Time-resolved microwave conductivity measurements demonstrated that improved extraction interface.