A New Strategy of Methylamine Iodide Solution Assisted Repair for Pinhole-Free Perovskite Films in High-Efficiency Photovoltaic under Ambient Conditions
Liang Wang a, Shuzhang Yang a, Fengjing Liu c, Chao Jiang c, Tingli Ma a b
a Kyushu Institute of Technology, Japan, 204 Hibikino Wakamatsu-ku, Kitakyushu - Fukuoka, 808, Japan
b China Jiliang University, Hangzhou, P. R. China, Hangzhou, China
c CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
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, Liang Wang, 075
Publication date: 14th October 2019

  Recently, perovskite solar cells (PSCs) with power conversion efficiency (PCE) of 25.2 % have been achieved and demonstrated a promising application prospect. For meetting the application requirements, how to preprare high quality perovskite films under ambient conditions is a key issue.

  In this abstract, we demonstrate a simple strategy for obtaining pinhole-free, homogeneous, well-crystallized perovskite films under ambient conditions. Briefly, an additional process of methylamine iodide solution assisted repair perovskite films was employed and added into the traditional two-step solvent process. The as-prepared perovskite film with high light-harvesting efficiency and long carrier lifetime is verified. By applying this film in TiO2-based PSCs, we achieved a high PCE of 13.11%, which is doubled with respect to that of the PSC not subjected to the same improvement procedure (6.46%). High open-circuit photovoltage, photocurrent density, and fill factor are the main contributions to the high PCE that results from low trap density and high recombination resistance of the resultant perovskite films. This stratery paves a new way for fabricating high quality perovskite films and PSC devices under ambient atmosphere.

This work was supported by the National Natural Science Foundation of China (Grants 51502049, 11374070, and 61327009) and the “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant XDA09040201).

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