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International Journal of Photoenergy
Volume 2017 (2017), Article ID 2562968, 9 pages
https://doi.org/10.1155/2017/2562968
Research Article

A PCBM-Modified TiO2 Blocking Layer towards Efficient Perovskite Solar Cells

1Huanghe Hydropower Solar Industry Technology Co. Ltd., 369 South Yanta Road, Xi’an 710061, China
2Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi’an 710071, China

Correspondence should be addressed to Chunfu Zhang; nc.ude.naidix@gnahzfc

Received 17 June 2017; Revised 2 October 2017; Accepted 12 October 2017; Published 7 December 2017

Academic Editor: Giulia Grancini

Copyright © 2017 Gang Lu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Organometal halide perovskite as a promising absorber in solar cells has caught tremendous attention in the past few years. Herein, a hydrophobic PCBM layer was introduced into planar heterojunction perovskite solar cells to form the TiO2/PCBM double blocking layer. The bilayer structure assures the formation of a dense, smooth, and pinhole-free blocking layer. And the PCBM layer can also be in favor of larger grain size perovskite film and further passivate the TiO2 blocking layer. Scanning electron microscope, atomic force microscope, and X-ray diffraction (XRD) results suggest the formation of a uniform and compact CH3NH3PbI3−xClx perovskite layer on the PCBM-modified TiO2 blocking layer. The solar cell has reached a PCE up to 16.37%, which is greatly larger than the control device with a PCE of 10.81%.