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Alloy‐Controlled Work Function for Enhanced Charge Extraction in All‐Inorganic CsPbBr 3 Perovskite Solar Cells
Author(s) -
Ding Jie,
Zhao Yuanyuan,
Duan Jialong,
He Benlin,
Tang Qunwei
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201800060
Subject(s) - work function , perovskite (structure) , photovoltaics , materials science , perovskite solar cell , solar cell , halide , photovoltaic system , doping , energy conversion efficiency , optoelectronics , quantum dot , carbon fibers , alloy , nanotechnology , chemical engineering , inorganic chemistry , chemistry , metallurgy , composite material , electrical engineering , layer (electronics) , composite number , engineering
All‐inorganic CsPbX 3 (X=I, Br) perovskite solar cells are regarded as cost‐effective and stable alternatives for next‐generation photovoltaics. However, sluggish charge extraction at CsPbX 3 /charge‐transporting material interfaces, which arises from large interfacial energy differences, have markedly limited the further enhancement of solar cell performance. In this work, the work function (WF) of the back electrode is tuned by doping alloyed PtNi nanowires in carbon ink to promote hole extraction from CsPbBr 3 halides, while an intermediate energy by setting carbon quantum dots (CQDs) at TiO 2 /CsPbBr 3 interface bridges electron transportation. The preliminary results demonstrate that the matching WFs and intermediate energy level markedly reduce charge recombination. A power conversion efficiency of 7.17 % is achieved for the WF‐tuned all‐inorganic perovskite solar cell, in comparison with 6.10 % for the pristine device, and this is further increased to 7.86 % by simultaneously modifying with CQDs. The high efficiency and improved stability make WF‐controlled all‐inorganic perovskite solar cells promising to develop advanced photovoltaic platforms.