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Cellulose‐Based Oxygen‐Rich Activated Carbon for Printable Mesoscopic Perovskite Solar Cells
Author(s) -
Liu Chao,
Gao Chenxu,
Wang Wei,
Wang Xiadong,
Wang Yifan,
Hu Wenjing,
Rong Yaoguang,
Hu Yue,
Guo Lianbo,
Mei Anyi,
Han Hongwei
Publication year - 2021
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.202100333
Subject(s) - cellulose , materials science , perovskite (structure) , bacterial cellulose , oxygen , carbon fibers , chemical engineering , electrolyte , energy conversion efficiency , graphene , open circuit voltage , electrode , nanotechnology , voltage , chemistry , optoelectronics , composite material , organic chemistry , electrical engineering , composite number , engineering
Carbon electrodes (CEs) are demonstrated as the most stable and cost‐effective back electrodes for perovskite solar cells (PSCs), which influence the performance of related PSCs significantly. Herein, oxygen‐rich activated carbon (AC) is synthesized from the most abundant biomass resource, cellulose, via a feasible carbonization and oxidization process and applied in CEs for hole‐conductor‐free printable mesoscopic PSCs (p‐MPSCs). The obtained cellulose‐based activated carbon (CAC) exhibits a high specific area of 477.14 m 2 g −1 and possesses a high oxygen content of 11.9%, promoting the wettability and contact between CEs and perovskites. Moreover, the high oxygen content also leads to an elevated work function of CEs. As a result, p‐MPSCs filled with (5‐AVA) 0.03 (MA) 0.97 PbI 3 based on CEs containing CAC give an efficiency of 15.5%, whereas those devices based on CEs with no CAC give an efficiency of 13.8%. The improved efficiency benefits from the promoted fill factor and open circuit voltage due to the optimized energy level alignment and enhanced charge extraction by CAC. This work presents a good example for the value‐added utilization of cellulose in the energy conversion systems and offers a feasible strategy for preparing oxygen‐rich CE for PSCs with enhanced performance.