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Inverted Perovskite Solar Cells with Efficient Mixed‐Fullerene Derivative Charge Extraction Layers
Author(s) -
Yin Xuewen,
Han Jianhua,
Zhou Yu,
Nan Hui,
Yao Zhibo,
Tai Meiqian,
Li Xin,
Li Jianbao,
Wang Ning,
Lin Hong
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800804
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , current density , hysteresis , conductivity , fullerene , electron mobility , optoelectronics , short circuit , open circuit voltage , electron , extraction (chemistry) , electrical resistivity and conductivity , analytical chemistry (journal) , voltage , chemical engineering , condensed matter physics , chemistry , electrical engineering , chromatography , organic chemistry , physics , quantum mechanics , engineering
The short‐circuit current density of inverted perovskite solar cells is unsatisfactory due to the intrinsic relatively low electron mobility and electrical conductivity of PC 61 BM. To solve this problem, a solution‐processed mixed‐fullerene derivative electron transporting material by mixing PC 61 BM with C 60 was developed to improve charge extraction capacity in fully low temperature processed devices. Incorporation of C 60 into the PC 61 BM layer improves the mobility from 2.15×10 −3 to 4.71×10 −3 cm 2 ⋅V −1 ⋅s −1 and the conductivity of electron transporting layers, thus enhancing the interfacial electron extraction capacity and reducing the electron transfer resistance. As a result, the average power conversion efficiency increases from 12.80% to 15.47% by 21% due to the significant increases in the average short‐circuit current density from 19.26 to 22.08 mA⋅cm −2 by 15%. Meanwhile, the optimal efficiency of 16.44% with rigid substrates and 12.93% with flexible substrates are obtained with almost no hysteresis. This work provides a novel and simple method to greatly improve the short‐circuit current density and hence the photovoltaic performance of inverted perovskite solar cells.