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Seed‐Assisted Growth for Low‐Temperature‐Processed All‐Inorganic CsPbIBr 2 Solar Cells with Efficiency over 10%
Author(s) -
Zhang Weihai,
Xiong Juan,
Li Jinhua,
Daoud Walid A.
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202001535
Subject(s) - materials science , halide , perovskite (structure) , annealing (glass) , crystallization , band gap , chemical engineering , nanotechnology , optoelectronics , inorganic chemistry , chemistry , composite material , engineering
All‐inorganic CsPbIBr 2 perovskite has recently received growing attention due to its balanced band gap and excellent environmental stability. However, the requirement of high‐temperature processing limits its application in flexible devices. Herein, a low‐temperature seed‐assisted growth (SAG) method for high‐quality CsPbIBr 2 perovskite films through reducing the crystallization temperature by introducing methylammonium halides (MAX, X = I, Br, Cl) is demonstrated. The mechanism is attributed to MA cation based perovskite seeds, which act as nuclei lowering the formation energy of CsPbIBr 2 during the annealing treatment. It is found that methylammonium bromide treated perovskite (Pvsk‐Br) film fabricated at low temperature (150 °C) shows micrometer‐sized grains and superior charge dynamic properties, delivering a device with an efficiency of 10.47%. Furthermore, an efficiency of 11.1% is achieved for a device based on high‐temperature (250 °C) processed Pvsk‐Br film via the SAG method, which presents the highest reported efficiency for inorganic CsPbIBr 2 solar cells thus far.