A C60 Modification Layer Using a Scalable Deposition Technology for Efficient Printable Mesoscopic Perovskite Solar Cells
Shujing Zhang a
a Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, P.R. China, China
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Poster, Shujing Zhang, 038
Publication date: 4th December 2020

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, TiO2 generally shows a relatively low electron mobility, which may result in charge accumulation and recombination at the TiO2/perovskite interface, thus hindering the improvements from the PMPSCs performance. In this study, we report a simple strategy to deposit a pristine C60 layer using a spray method and modify the low electrical conductivity of TiO2 in PMPSCs. The preferable electron extraction and transportation properties of pristine C60 and the up-shifted lowest unoccupied molecular orbital (LUMO) of the C60 modified TiO2, i.e., TiO2(C60) 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 TiO2(C60)-based device presents a lower hysteresis effect than that of the TiO2-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.

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