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A C 60 Modification Layer Using a Scalable Deposition Technology for Efficient Printable Mesoscopic Perovskite Solar Cells
Author(s) -
Tian Chengbo,
Zhang Shujing,
Li Sheng,
Mei Anyi,
Li Da,
Liu Shuang,
Zhang Deyi,
Hu Yue,
Rong Yaoguang,
Han Hongwei
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.201800174
Subject(s) - perovskite (structure) , mesoscopic physics , materials science , energy conversion efficiency , hysteresis , homo/lumo , layer (electronics) , chemical engineering , nanotechnology , electron mobility , optoelectronics , chemistry , physics , condensed matter physics , organic chemistry , molecule , engineering
Carbon‐based, hole‐conductor‐free, full‐printable, mesoscopic perovskite solar cells (PMPSCs) have attracted much attention due to their superior stability, low cost, and potential scalability. However, TiO 2 generally shows a relatively low electron mobility, which may result in charge accumulation and recombination at the TiO 2 /perovskite interface, thus hindering the improvements from the PMPSCs performance. In this study, a simple strategy to deposit a pristine C 60 layer using a spray method is reported and the low electrical conductivity of TiO 2 in PMPSCs is modified. The preferable electron extraction and transportation properties of pristine C 60 and the up‐shifted lowest unoccupied molecular orbital (LUMO) of the C 60 modified TiO 2 , that is, TiO 2 (C 60 ) layer, efficiently promotes the charge transfer at the interface between the electron transport layer (ETL) and the perovskite. As a result, a significantly improved power conversion efficiency (PCE) of 15.4% is yielded, which is much higher than that of the control device (13.7%). In addition, the TiO 2 (C 60 )‐based device presents a lower hysteresis effect than that of the TiO 2 ‐based device, which can likely be attributed to the reduced space charge accumulation at the perovskite/ETL interface. The present work provides a simple approach to boost the efficiency of PMPSCs and paves the way for the industrialization of PMPSCs.