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Low‐Temperature Processed Nanostructured Rutile TiO 2 Array Films for Perovskite Solar Cells With High Efficiency and Stability
Author(s) -
Wu Shufang,
Cheng Chi,
Jin Jingpeng,
Wang Jinming,
Peng Tianyou
Publication year - 2018
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201700164
Subject(s) - materials science , energy conversion efficiency , tin oxide , perovskite (structure) , chemical engineering , rutile , nanotechnology , chemical bath deposition , thin film , substrate (aquarium) , optoelectronics , doping , engineering , oceanography , geology
The rutile TiO 2 array (RTA) films consisting of vertically oriented nanoneedles and/or nanosheets are grown on a fluorine‐doped tin oxide (FTO) glass substrate via a chemical bath deposition (CBD) process at 70 °C, and are utilized as electron transport layer (ETL) for CH 3 NH 3 PbI 3 ‐based perovskite solar cells (PSCs). The morphology and microstructure of the RTA films can be tuned by varying the CBD time. A mixed nanoneedles/nanosheets array film (∼250 nm thickness) derived from 60 min CBD process achieve a power conversion efficiency (PCE) up to 15.4% with reduced hysteresis, improved reproducibility, and stability as compared to those PSCs based on traditional mesoscopic‐TiO 2 or planar‐TiO 2 ETLs, which is due to the lower charge recombination, more efficient hole‐blocking, and electron transport. After aging and storage in the dark, the optimal PSC exhibits a slightly improved PCE (16.3%), which is the highest one among those CH 3 NH 3 PbI 3 ‐based PSCs fabricated with low‐temperature processed RTAs reported previously. This work is the first example of vertically oriented nanosheets and/or nanoneedles RTA film grown on a conductive glass to serve as ETL of PSC, and the low‐temperature procedure of the RTA film paves a promising low‐cost way for fabricating large‐scale PSCs.