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Red‐Carbon‐Quantum‐Dot‐Doped SnO 2 Composite with Enhanced Electron Mobility for Efficient and Stable Perovskite Solar Cells
Author(s) -
Hui Wei,
Yang Yingguo,
Xu Quan,
Gu Hao,
Feng Shanglei,
Su Zhenhuang,
Zhang Miaoran,
Wang Jiaou,
Li Xiaodong,
Fang Junfeng,
Xia Fei,
Xia Yingdong,
Chen Yonghua,
Gao Xingyu,
Huang Wei
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201906374
Subject(s) - materials science , perovskite (structure) , electron mobility , passivation , quantum dot , doping , optoelectronics , chemical engineering , carbon fibers , nanotechnology , composite number , layer (electronics) , composite material , engineering
An efficient electron transport layer (ETL) plays a key role in promoting carrier separation and electron extraction in planar perovskite solar cells (PSCs). An effective composite ETL is fabricated using carboxylic‐acid‐ and hydroxyl‐rich red‐carbon quantum dots (RCQs) to dope low‐temperature solution‐processed SnO 2 , which dramatically increases its electron mobility by ≈20 times from 9.32 × 10 −4 to 1.73 × 10 −2 cm 2 V −1 s −1 . The mobility achieved is one of the highest reported electron mobilities for modified SnO 2 . Fabricated planar PSCs based on this novel SnO 2 ETL demonstrate an outstanding improvement in efficiency from 19.15% for PSCs without RCQs up to 22.77% and have enhanced long‐term stability against humidity, preserving over 95% of the initial efficiency after 1000 h under 40–60% humidity at 25 °C. These significant achievements are solely attributed to the excellent electron mobility of the novel ETL, which is also proven to help the passivation of traps/defects at the ETL/perovskite interface and to promote the formation of highly crystallized perovskite, with an enhanced phase purity and uniformity over a large area. These results demonstrate that inexpensive RCQs are simple but excellent additives for producing efficient ETLs in stable high‐performance PSCs as well as other perovskite‐based optoelectronics.