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Improving Charge Transport via Intermediate‐Controlled Crystal Growth in 2D Perovskite Solar Cells
Author(s) -
Gao Liguo,
Zhang Fei,
Xiao Chuanxiao,
Chen Xihan,
Larson Bryon W.,
Berry Joseph J.,
Zhu Kai
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201901652
Subject(s) - perovskite (structure) , materials science , crystal (programming language) , perovskite solar cell , chemical engineering , crystal growth , semiconductor , dimethyl sulfoxide , phase (matter) , optoelectronics , energy conversion efficiency , crystallography , organic chemistry , chemistry , computer science , engineering , programming language
Reduced‐dimensional hybrid perovskite semiconductors have recently attracted significant attention due to their promising stability and optoelectronic properties. However, the issue of poor charge transport in 2D perovskites limits its application. Here, studies on intermediate‐controlled crystal growth are reported to improve charge carrier transport in 2D perovskite thin films. It is shown that the coordination strength of solvents with perovskite precursor affects the initial state of intermediate phase formation as well as the subsequent perovskite layer growth. Tuning the solvent composition with a mixture (5:5) of dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) leads to the growth of highly orientated 2D perovskite films with much‐improved optoelectronic properties (faster transport by ≈50x, longer carrier lifetime by ≈4x, and lower defect density by ≈30x) than the film prepared with pure DMF. Consequently, perovskite solar cells based on DMF/DMSO (5:5) show >80% efficiency improvement than the devices based on pure DMF.