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Oriented Perovskite Crystal towards Efficient Charge Transport in FASnI 3 Perovskite Solar Cells
Author(s) -
Gu Wenwen,
Xu Xin,
Chen Junwen,
Ma Ben,
Qin Minchao,
Zhu Wenjing,
Qian Jie,
Qin Zhaotong,
Shen Wei,
Lu Yao,
Zhang Wenzhu,
Chen Shufen,
Lu Xinhui,
Huang Wei
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000153
Subject(s) - perovskite (structure) , materials science , formamidinium , energy conversion efficiency , doping , substrate (aquarium) , iodide , optoelectronics , crystal (programming language) , tin , nanotechnology , chemical engineering , inorganic chemistry , chemistry , computer science , metallurgy , oceanography , engineering , programming language , geology
Despite a higher power conversion efficiency (PCE) than other lead‐free perovskite solar cells (PSCs) due to intrinsically excellent optoelectronic properties and suitable bandgaps of tin (Sn) perovskites, Sn‐based PSCs still suffer from issues of stability and efficiency for practical applications. Herein, a novel strategy of tuning perovskite crystal orientation toward ≈45° with respect to the substrate by doping 2,3‐diaminopropionic acid monohydrochloride (2,3‐DAPAC) into formamidinium tin iodide (FASnI 3 ) is proposed, which facilitates charge transport in the perovskite film and consequent device performances. In addition, the incorporation of 2,3‐DAPAC into FASnI 3 enables dense and smooth high‐quality perovskite films with less Sn vacancies. Applications of the 2,3‐DAPAC‐treated FASnI 3 films into PSCs acquire a champion PCE of 7.23%, showing 37.2% enhancement compared with 5.27% of the control device. Moreover, the storage stabilities of both perovskite films and PSCs are significantly prolonged with improved film quality.