[20p-PB4-1~57] 12.5 Organic solar cells

▲ [20p-PB4-19] Interface Modification of TiO₂ in Planar Perovskite solar Cells using low-temperature Brookite TiO₂ Nanoparticles

〇(M1)Visal Sem¹, Md Shahiduzzaman^1,2, Mizuki Kuniyoshi¹, Tetsuya Kaneko¹, Tetsuhiro Katsumata¹, Satoru Iwamori¹, Koji Tomita¹, Masao Isomura¹ (1.Tokai Univ., 2.Kanazawa Univ.)

Keywords:Planar Perovskite Solar Cells, Interface Engineering, Low temperature BK-TiO2

Hybrid organometal halide perovskites solar cells (PSCs) have attracted much attention in the third-generation of thin-film photovoltaic. Interface modification turns a promising strategy to yield highly efficient planar heterojunction (PHJ) PSCs. The deep trap states on the compact-TiO₂ surface results in a huge leakage current and recombination of charge carriers. To solve the problems, the interfacial engineering of electron transport layer (ETL) compact TiO₂ was conducted by coating a low-temperature single crystalline brookite (BK) TiO₂ nanoparticles (NPs) with average diameter sizes about 30 nm, which causes a uniform and pin-hole-free layer. Herein, the compact TiO₂/BK-TiO₂ NPs bilayers were formed by spray pyrolysis (SP) deposition and spin coating (SC) process, respectively, and applied to PSCs as an ETL.