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Suppressing Charge Recombination and Ultraviolet Light Degradation of Perovskite Solar Cells Using Silicon Oxide Passivation
Author(s) -
Ren Jing,
Luo Qiang,
Hou Qinzhi,
Chen Hui,
Liu Tao,
He Hongcai,
Wang Jinshu,
Shao Qian,
Dong Mengyao,
Wu Shide,
Wang Ning,
Lin Jing,
Guo Zhanhu
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900688
Subject(s) - materials science , passivation , photocurrent , perovskite (structure) , optoelectronics , silicon , energy conversion efficiency , titanium oxide , ultraviolet , oxide , ultraviolet light , layer (electronics) , nanotechnology , chemical engineering , engineering , metallurgy
Organic‐metal lead halide perovskite solar cells (PSCs) featuring low‐cost and high efficiency have been recognized as promising photovoltaic devices, but their serious charge recombination and ultraviolet light irradiation instability limit their output efficiency and long‐term operation. In this work, we have introduced silicon oxide as an interfacial modifier of the electron transporting layer in TiO 2 ‐based planar heterojunction PSCs. The incorporation of a silicon oxide modifier passivates the trap states of perovskite absorber and suppresses the charge recombination of PSCs. As a consequence, a competitive solar‐to‐electricity conversion efficiency of 18.0 % was achieved for the device fabricated with the silicon‐oxide‐modified TiO 2 electron extraction layer, which is increased by 15 % compared with the PSC fabricated with pristine TiO 2 ; this can be attributed to the significantly increased open‐circuit voltage and photocurrent density. Furthermore, the ultraviolet light irradiation stability of PSCs is greatly improved, resulting from the low photocatalytic activity of the silicon‐oxide‐modified TiO 2 electron transporting layer, as revealed by the photoelectrochemical oxidation of CH 3 NH 2 . This work represents a feasible step through interfacial engineering toward the realization of ultraviolet‐light‐stable and scalable PSCs.