Enhancing Performance and Uniformity of Perovskite Solar Cells via a Solution-Processed C70 Interlayer for Interface Engineering

Ya-Qing Zhou; Bao-Shan Wu; Guan-Hua Lin; Yang Li; Di-Chun Chen; Peng Zhang; Ming-Yu Yu; Bin-Bin Zhang; Da-Qin Yun

doi:10.1021/acsami.7b08429

Enhancing Performance and Uniformity of Perovskite Solar Cells via a Solution-Processed C₇₀ Interlayer for Interface Engineering

ACS Appl Mater Interfaces. 2017 Oct 4;9(39):33810-33818. doi: 10.1021/acsami.7b08429. Epub 2017 Sep 19.

Authors

Ya-Qing Zhou¹, Bao-Shan Wu², Guan-Hua Lin¹, Yang Li¹, Di-Chun Chen³, Peng Zhang¹, Ming-Yu Yu¹, Bin-Bin Zhang¹, Da-Qin Yun¹

Affiliations

¹ College of Energy, Xiamen University , Xiamen 361005, P. R. China.
² State Key Laboratory for Physical Chemistry of Solid Surfaces, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, P. R. China.
³ Xiamen Branch of Luoyang Ship Material Research Institute , Xiamen 361006, P. R. China.

PMID: 28884580
DOI: 10.1021/acsami.7b08429

Abstract

Although some kinds of semiconductor metal oxides (SMOs) have been applied as electron selective layers (ESLs) for planar perovskite solar cells (PSCs), electron transfer is still limited by low electron mobility and defect film formation of SMO ESLs fabricated via low-temperature solution process. Herein, the C₇₀ interlayer between TiO₂ and (HC(NH₂)₂PbI₃)_x(CH₃NH₃PbCl₃)_1-x is prepared by spin-coating and low-temperature annealing for planar n-i-p PSCs. The resultant TiO₂/C₇₀ ESL shows good surface morphology, efficient electron extraction, and facilitation of high-quality perovskite film formation, which can be attributed to the suitable nanosize and the superior electronic property of C₇₀ molecules. In comparison with pristine TiO₂-based PSCs, the efficiency and hysteresis index are, respectively, enhanced 28% and reduced 76% by adding the C₇₀ interlayer between TiO₂ and perovskite on the basis of statistical data of more than 50 cells. With the main advantages of low-temperature process and optimized interface, the champion efficiency of PSCs on flexible substrates could exceed 12% in contrast with the above 18% on rigid substrate.

Keywords: electron selective layer; flexible solar cell; fullerene; low-temperature solution process; perovskite solar cell.