Premium
Co/Eu co‐doped electron transport layer enhances charge extraction and light absorption for efficient carbon‐based HTM ‐free perovskite solar cells
Author(s) -
Zhang Zhenyun,
Qiu Fazheng,
Shen Tao,
Xu Lei,
Ma Jingyuan,
Qi Junjie
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6137
Subject(s) - doping , materials science , perovskite (structure) , optoelectronics , photovoltaic system , energy conversion efficiency , absorption (acoustics) , bimetal , carbon fibers , nanotechnology , chemical engineering , electrical engineering , composite material , composite number , engineering
Summary Carbon‐based hole‐transport materials (HTM)‐free perovskite solar cells (C‐PSCs) have received increasing attention in photovoltaic fields thanks to the low priced and superior stability. Nevertheless, the C‐PSCs still suffer from low power conversion efficiencies (PCEs) in comparison with conventional PSCs. Here, we report a bimetal Co/Eu co‐doping strategy to modify the electron transportation layer (ETL), simultaneously improving the charge extraction and light absorption and thus the performance of HTM‐free C‐PSCs. Systematic experiments suggest that (i) Co doping passivates the electronic trap‐states in TiO 2 ETL, improving the charge transport properties; (ii) Eu doping enhances the photoresponse of PSCs. Combining them together in ETL, all the photovoltaic parameters of C‐PSCs are appreciably enhanced, leading to a PCE leap from 11.12 to 14.06% while keeping a superior device stability. These results may provide possibilities for the exploration of high‐efficiency C‐PSCs by further optimizing ETL with suitable doping.