Issue 18, 2015
From the journal:

Journal of Materials Chemistry A

Interface engineering of perovskite solar cells with PEO for improved performance†

H. P. Dong,a   Y. Li,b   S. F. Wang,b   W. Z. Li,a   N. Li,a   X. D. Guoa  and  L. D. Wang*a  

* Corresponding authors

a Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, P. R. China
E-mail: chldwang@mail.tsinghua.edu.cn

b Institute of Modern Optics & State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing, P. R. China

Abstract

Interface engineering is an important and efficient way to further improve the conversion efficiency of perovskite solar cells. In this study, we report the modification of the electron transport layer (ETL) using a thin layer of PEO. Characterizations showed that PEO was uniformly coated on top of the original TiOx ETL, without resulting in an evident change of the surface morphology, hydrophilic ability or transparency. With the interface dipole formed at the interface, the work function of the ETL greatly decreased. Compared with devices with TiOx only, devices based on the modified ETL gave a nearly 15% enhancement to the overall conversion efficiency, with both Voc and Jsc improved. Further studies showed that the improved performance could mainly be attributed to the better retardation of back recombination and the enhanced electron collection efficiency by means of the PEO thin layer modification.

Graphical abstract: Interface engineering of perovskite solar cells with PEO for improved performance

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Supplementary files

Article information

DOI
https://doi.org/10.1039/C5TA00407A
Article type
Paper
Submitted
18 Jan 2015
Accepted
26 Mar 2015
First published
27 Mar 2015

J. Mater. Chem. A, 2015,3, 9999-10004

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Interface engineering of perovskite solar cells with PEO for improved performance

H. P. Dong, Y. Li, S. F. Wang, W. Z. Li, N. Li, X. D. Guo and L. D. Wang, J. Mater. Chem. A, 2015, 3, 9999 DOI: 10.1039/C5TA00407A

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