[15p-A402-1~11] 12.5 Organic solar cells

▲ [15p-A402-9] Efficient Planar Perovskite Solar Cells by Using Oblique Electrostatic Inkjet-Deposited TiO₂ Electron Transport Layer

〇Md Shahiduzzaman^1,2, Koji Tomita², Masao Isomura², Tetsuya Taima¹, Shinjiro Umezu³, Satoru Iwamori² (1.Kanazawa Univ., 2.Tokai Univ., 3.Waseda Univ.)

Keywords:Oblique electrostatic inkjet technique, TiO2 Compact Layer, Planar Perovskite Solar Cells

In the design of electron transport layers (ETLs) to improve the performance of perovskite solar cells (PSCs), efficient electron extraction and transport are important aspects. Herein, we set up a simple and novel oblique electrostatic inkjet (OEI) technique, for the first time, to pattern titanium oxide (TiO2) compact layer (CL) on fluorine-doped tin oxide (FTO)-substrate, without the required of vacuum environment and used as the ETL in PSCs (Sci. Rep., 2019, Article number: 19494). This bottom-up OEI technique solely enables for controlling the surface morphology and thickness of TiO2 CL by simply manipulating the coating times. We test and compare with TiO2 CL produced using the spin-coating and spray pyrolysis, OEI-deposited TiO2 CL exhibit satisfactory surface coverage, and smooth morphology as ETLs in PSCs. The power-conversion efficiencies of PSCs with OEI-deposited TiO2 CL as the ETL were as high as 13.19%. Thus, the present study provides an important advance in the aspects to the simple, low-cost and easy scale-up technique and can be a new TiO2 CL ETL deposition candidate for highly efficient planar PSCs, which may contribute to the future mass production.