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Copper Salts Doped Spiro‐OMeTAD for High‐Performance Perovskite Solar Cells
Author(s) -
Li Meng,
Wang ZhaoKui,
Yang YingGuo,
Hu Yun,
Feng ShangLei,
Wang JinMiao,
Gao XingYu,
Liao LiangSheng
Publication year - 2016
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201601156
Subject(s) - materials science , perovskite (structure) , iodide , doping , thiocyanate , conductivity , perovskite solar cell , composite number , crystallization , planar , chemical engineering , solar cell , optoelectronics , inorganic chemistry , composite material , chemistry , computer graphics (images) , computer science , engineering
The development of effective and stable hole transporting materials (HTMs) is very important for achieving high‐performance planar perovskite solar cells (PSCs). Herein, copper salts (cuprous thiocyanate (CuSCN) or cuprous iodide (CuI)) doped 2,2,7,7‐tetrakis( N , N ‐di‐ p ‐methoxyphenylamine)‐9,9‐spirobifluorene (spiro‐OMeTAD) based on a solution processing as the HTM in PSCs is demonstrated. The incorporation of CuSCN (or CuI) realizes a p‐type doping with efficient charge transfer complex, which results in improved film conductivity and hole mobility in spiro‐OMeTAD:CuSCN (or CuI) composite films. As a result, the PCE is largely improved from 14.82% to 18.02% due to obvious enhancements in the cell parameters of short‐circuit current density and fill factor. Besides the HTM role, the composite film can suppress the film aggregation and crystallization of spiro‐OMeTAD films with reduced pinholes and voids, which slows down the perovskite decomposition by avoiding the moisture infiltration to some extent. The finding in this work provides a simple method to improve the efficiency and stability of planar perovskite solar cells.