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Efficient and Stable Planar n‐i‐p Perovskite Solar Cells with Negligible Hysteresis through Solution‐Processed Cu 2 O Nanocubes as a Low‐Cost Hole‐Transport Material
Author(s) -
Elseman Ahmed Mourtada,
Selim Mohamed S.,
Luo Lie,
Xu Cun Yun,
Wang Gang,
Jiang Yi,
Liu De Bei,
Liao Li Ping,
Hao Zhifeng,
Song Qun Liang
Publication year - 2019
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.201901430
Subject(s) - perovskite (structure) , hysteresis , planar , materials science , chemical engineering , nanotechnology , condensed matter physics , physics , computer science , engineering , computer graphics (images)
Organic–inorganic halide perovskite solar cells (PSCs) have reached certified efficiencies of over 23 % with expensive organic hole‐transporting materials. However, the use of an inorganic hole‐transport layer (HTL) remains crucial as it would reduce cost combined with higher mobility and stability. In this direction, the application of Cu 2 O as the top layer in PSCs is still complicated owing to the difficulty of solution processing. Herein, a solution‐processing method is reported for preparing Cu 2 O nanocubes as a p‐type HTL in regular structure ( n‐i‐p ) PSCs. The controlled synthesis of Cu 2 O nanocubes in a size range of 60–80 nm is achieved without using any surfactants, which are usually toxic and tricky to remove. The new structure of these Cu 2 O nanocubes enhances the carrier mobility with preferable energy alignment to the perovskite layer and superb stability. The PSCs based on these Cu 2 O nanocubes HTMs could achieve an efficiency exceeding 17 % with high stability, whereas organic P3HT‐based PSCs display an efficiency of 15.59 % with a poorer running stability. This indicates that Cu 2 O nanocubes are a promising HTM for efficient and stable PSCs.