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Promoting the Hole Extraction with Co 3 O 4 Nanomaterials for Efficient Carbon‐Based CsPbI 2 Br Perovskite Solar Cells
Author(s) -
Zhou Yang,
Zhang Xiang,
Lu Xubing,
Gao Xingsen,
Gao Jinwei,
Shui Lingling,
Wu Sujuan,
Liu JunMing
Publication year - 2019
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.201800315
Subject(s) - perovskite (structure) , materials science , carbon fibers , hysteresis , photoelectric effect , photovoltaic system , electrode , optoelectronics , energy conversion efficiency , perovskite solar cell , nanomaterials , thermal stability , nanotechnology , chemical engineering , chemistry , composite number , condensed matter physics , electrical engineering , physics , composite material , engineering
Carbon‐based perovskite solar cells (PSCs) have gathered much attention due to their excellent thermal stability and low cost. However, the typically used hole‐conductor‐free PSCs based on carbon electrodes show the worst performance due to the serious charge recombination at the perovskite/carbon interface. In this work, the efficient and stable carbon‐based CsPbI 2 Br PSCs using Co 3 O 4 as the hole transport material (HTM) are fabricated and their photoelectric properties are systematically investigated. It is found that the Co 3 O 4 inorganic HTM effectively promotes photo‐generated charges separation and extraction, and suppresses charge recombination at the CsPbI 2 Br/carbon electrode interface, resulting in the improved photovoltaic performance. At the optimal Co 3 O 4 concentration, the carbon‐based CsPbI 2 Br PSCs achieve the maximum efficiency of 11.21% with a negligible J – V hysteresis. This work provides a novel strategy to fabricate efficient and stable all‐inorganic PSCs.