Highly Efficient Inverted Perovskite Solar Cells Based on Self−assembled Graphene Derivatives
Xuewen Yin a, Hong Lin a
a State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Xuewen Yin, 062
Publication date: 23rd October 2018

The performance of inverted perovskite solar cells (PSCs) based on graphene oxide hole transporting materials is still unsatisfactory due to the high degree of surface oxygen contents and the insulating property. In this study, thickness−controlled and full−coverage graphene oxide films prepared by layer−by−layer self−assembly technique are firstly developed as hole transporting layers in PSCs. Meanwhile, conductivity tunable reduced graphene oxide films are in−situ prepared by an environment−friendly and efficient reductant system. A superior PCE of 16.28% based on rGO as prepared is obtained, resulting in an increment by approximately 33% compared with 12.26% of the device based on GO−1 as mentioned. At the same time, this work reveals an anomalous charge−extraction behavior of PSCs based on GO or rGO HTLs. Competition effect of interfacial recombination, charge transportation and radiation recombination in this process are proposed to analyze the internal mechanisms. This work provides a facile and novel method to prepare GO or rGO films, which can be used as efficient charge−extraction layers and even electrodes in inverted PSCs.

This work was supported by the National Natural Science Foundation of China (NSFC, 51772166), the Projects of International Cooperation and Exchanges NSFC (51561145007), the Ministry of Science & Technology, P. R. China: Sino−Italy International Cooperation on Innovation (2016YFE0104000) and the National Energy Novel Materials Center (NENMC−II−1705)

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