TY - JOUR
T1 - Suppression of charge carrier recombination in lead-free tin halide perovskite via lewis base post-treatment
AU - Kamarudin, Muhammad Akmal
AU - Hirotani, Daisuke
AU - Wang, Zhen
AU - Hamada, Kengo
AU - Nishimura, Kohei
AU - Shen, Qing
AU - Toyoda, Taro
AU - Iikubo, Satoshi
AU - Minemoto, Takashi
AU - Yoshino, Kenji
AU - Hayase, Shuzi
N1 - Funding Information:
M.A.K. and H.D. contributed equally to this work. The authors acknowledge the support from JST Mirai (JPMJMI17EA).
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/9/5
Y1 - 2019/9/5
N2 - Lead-free tin perovskite solar cells (PSCs) show the most promise to replace the more toxic lead-based perovskite solar cells. However, the efficiency is significantly less than that of lead-based PSCs as a result of low open-circuit voltage. This is due to the tendency of Sn2+ to oxidize into Sn4+ in the presence of air together with the formation of defects and traps caused by the fast crystallization of tin perovskite materials. Here, post-treatment of the tin perovskite layer with edamine Lewis base to suppress the recombination reaction in tin halide PSCs results in efficiencies higher than 10%, which is the highest reported efficiency to date for pure tin halide PSCs. The X-ray photoelectron spectroscopy data suggest that the recombination reaction originates from the nonstoichiometric Sn:I ratio rather than the Sn4+:Sn2+ ratio. The amine group in edamine bonded the undercoordinated tin, passivating the dangling bonds and defects, resulting in suppressed charge carrier recombination.
AB - Lead-free tin perovskite solar cells (PSCs) show the most promise to replace the more toxic lead-based perovskite solar cells. However, the efficiency is significantly less than that of lead-based PSCs as a result of low open-circuit voltage. This is due to the tendency of Sn2+ to oxidize into Sn4+ in the presence of air together with the formation of defects and traps caused by the fast crystallization of tin perovskite materials. Here, post-treatment of the tin perovskite layer with edamine Lewis base to suppress the recombination reaction in tin halide PSCs results in efficiencies higher than 10%, which is the highest reported efficiency to date for pure tin halide PSCs. The X-ray photoelectron spectroscopy data suggest that the recombination reaction originates from the nonstoichiometric Sn:I ratio rather than the Sn4+:Sn2+ ratio. The amine group in edamine bonded the undercoordinated tin, passivating the dangling bonds and defects, resulting in suppressed charge carrier recombination.
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U2 - 10.1021/acs.jpclett.9b02024
DO - 10.1021/acs.jpclett.9b02024
M3 - Article
C2 - 31423786
AN - SCOPUS:85072538494
SN - 1948-7185
VL - 10
SP - 5277
EP - 5283
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 17
ER -