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High‐Performance Hole‐Extraction Layer of Sol–Gel‐Processed NiO Nanocrystals for Inverted Planar Perovskite Solar Cells
Author(s) -
Zhu Zonglong,
Bai Yang,
Zhang Teng,
Liu Zhike,
Long Xia,
Wei Zhanhua,
Wang Zilong,
Zhang Lixia,
Wang Jiang,
Yan Feng,
Yang Shihe
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201405176
Subject(s) - non blocking i/o , materials science , pedot:pss , perovskite (structure) , perovskite solar cell , layer (electronics) , thin film , solution process , solar cell , nanocrystal , planar , chemical engineering , optoelectronics , nanotechnology , chemistry , catalysis , organic chemistry , computer graphics (images) , computer science , engineering
Abstract Hybrid organic/inorganic perovskite solar cells have been rapidly evolving with spectacular successes in both nanostructured and thin‐film versions. Herein, we report the use of a simple sol–gel‐processed NiO nanocrystal (NC) layer as the hole‐transport layer in an inverted perovskite solar cell. The thin NiO NC film with a faceted and corrugated surface enabled the formation of a continuous and compact layer of well‐crystallized CH 3 NH 3 PbI 3 in a two‐step solution process. The hole‐extraction and ‐transport capabilities of this film interfaced with the CH 3 NH 3 PbI 3 film were higher than those of organic PEDOT:PSS layers. The cell with a NiO NC film with a thickness of 30–40 nm exhibited the best performance, as a thinner layer led to a higher leakage current, whereas a thicker layer resulted in a higher series resistance. With the NiO film, we observed a cell efficiency of 9.11 %, which is by far the highest reported for planar perovskite solar cells based on an inorganic hole‐extracting layer.