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High‐Performance Perovskite Solar Cells Using Iodine as Effective Dopant for Spiro‐OMeTAD
Author(s) -
Yuan Pengqiang,
Wu Jihuai,
Sun Weihai,
Zhu Qianjin,
Zhang Mingjing,
Zou Jinjun,
Wang Xiaobing,
Liu Xuping,
Yang Yuqian,
Lan Zhang
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201901171
Subject(s) - dopant , perovskite (structure) , iodine , energy conversion efficiency , materials science , doping , optoelectronics , iodide , chemical engineering , nanotechnology , chemistry , inorganic chemistry , engineering , metallurgy
The p‐type dopant of spiro‐OMeTAD has been identified as a rational strategy for the enhancement of the hole transport ability in perovskite solar cells (PSCs). Herein, to enhance the conductivity and hole‐extraction ability of spiro‐OMeTAD, a low‐cost and facile method is developed by introducing iodine into the hole transport materials. Morphology observation, energy gap characterization, and photoelectrochemical measurements indicate that as a mild Lewis acid, oxidant, and p‐type dopant, iodine moderately oxidizes spiro‐OMeTAD, optimizes the energy match with perovskite, mitigates the trap state density, interface resistance, and carrier recombination, and improves the hole‐extraction ability and carrier transport capacity. Consequently, a planar PSC based on the spiro‐OMeTAD doped with 8 wt% iodine achieves a champion power conversion efficiency (PCE) of 19.69%. Conversely, the device with pristine spiro‐OMeTAD gets an efficiency of 18.04%. This work indicates a potential application of iodine as a promising p‐type dopant for spiro‐OMeTAD in PSCs.