Room-Temperature Sputtered SnO2 Thin Film as an Electron Transport Layer for Mixed-Cation Planar Heterojunction Perovskite Solar Cells

Issei Takenaka^a, Motoshi Nakamura^a^,^c, Yoshinori Kimoto^a, Yuta Higashino^a, Hiroki Sugimoto^a, Naoyuki Shibayama^b, Chie Nishiyama^c, Keishi Tada^b, Takeru Bessho^c, Hiroshi Segawa^b^,^c

^aAdvanced Technology Research Laboratories, Idemitsu Kosan Co.,Ltd., Kanagawa, Japan, 123-1 Shimokawairi, Atsugi, Japan

^bUniversity of Tokyo, Japan, Japan

^cUniversity of Tokyo, Japan, Japan

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)

Tsukuba-shi, Japan, 2020 January 20th - 22nd

Organizers: Michio Kondo and Takurou Murakami

Poster, Issei Takenaka, 071
Publication date: 14th October 2019

We report room-temperature sputtered SnO₂ thin film and its application on perovskite solar cells (PSCs). SnO₂ is a promising alternative for TiO₂ as an electron transport layer (ETL) of PSCs, providing better stability against UV irradiation [1]. Solution-based SnO₂ [2] has been widely used, while room-temperature dry processes such as atomic-layer deposition or sputtering has been less explored.

Here, we investigate room-temperature sputtered SnO₂ as an ETL for PSCs using mixed-cation perovskite of FA_0.80MA_0.15K_0.05Pb (I_0.85Br_0.15)₃ and find that sputtered SnO₂ exhibits superior power conversion efficiency of 19.1% where solution-based SnO₂ shows 18.0%. This performance enhancement is mainly attributed to open-circuit voltage improvement from 1057 to 1113 mV. Coverage, crystalline quality of SnO₂ and perovskite layer are investigated. Additional discussion is conducted regarding optical property of SnO₂/perovskite interface, resulting in slight increase of the short-circuit current density from 22.2 to 22.6 mA/cm². Stability test under operational condition and its effect on elemental distribution will be further discussed in the presentation.

References:

[1] Roose, B.; Baena, J.-P. C.; Gödel, K. C.; Graetzel, M.; Hagfeldt, A.; Steiner, U.; Abate, A. Mesoporous SnO2 Electron Selective Contact Enables UV-Stable Perovskite Solar Cells. Nano Energy. 2016, 30, 517–522.

[2] Jiang, Q.; Zhang, L.; Wang, H.; Yang, X.; Meng, J.; Liu, H.; Yin, Z.; Wu, J.; Zhang, X.; You, J. Enhanced Electron Extraction Using SnO2 for High-Efficiency Planar-Structure HC(NH2)2PbI3-Based Perovskite Solar Cells. Nat. Energy 2016, 2 (1), 16177.

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