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Crystallization Control of Methylammonium‐Free Perovskite in Two‐Step Deposited Printable Triple‐Mesoscopic Solar Cells
Author(s) -
Du Jiankang,
Liu Shuang,
Wu Jiawen,
Zhang Weihua,
Zhang Wenhao,
Mei Anyi,
Rong Yaoguang,
Hu Yue,
Han Hongwei
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.202000455
Subject(s) - formamidinium , crystallization , mesoscopic physics , perovskite (structure) , materials science , chemical engineering , nanotechnology , mineralogy , chemistry , physics , engineering , quantum mechanics
The evolution from the original methylammonium (MA)‐ to formamidinium (FA)‐dominated perovskite makes a crucial contribution to improve the photoelectric performance of perovskite solar cells (PSCs) in a decade. However, to obtain α‐FAPbI 3 , annealing temperature above 100 °C is essential. In addition, it is still challenging to deposit a uniform and high‐quality FA‐based perovskite absorber in printable triple‐mesoscopic PSC due to the complicated mesoscopic structure. Herein, a low‐temperature, two‐step sequential deposition method is used for pure FAPbI 3 perovskite in printable triple‐mesoscopic PSC. By using different lead sources, the crystallization and morphology of lead iodide (PbI 2 ) are finely controlled, which modulates the crystallization and pore filling of perovskite in mesoscopic structure. The improved interface contact promotes the transfer of charge carrier from perovskite to TiO 2 . With the further introduction of cesium bromide (CsBr) into lead precursor, a power conversion efficiency of 16.24% is achieved. This study provides a deeper understanding of the pore filling and crystallization for both PbI 2 and perovskite, and helps explore and optimize the deposition process of perovskite in mesoscopic structure.