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Issue 52, 2019
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A zwitterionic polymer as an interfacial layer for efficient and stable perovskite solar cells

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Abstract

Perovskite solar cells have been rapidly developed in the past ten years. It was demonstrated that the interfacial layer plays an important role in device performance of perovskite solar cells. In this study, we report utilization of a photoinitiation-crosslinked zwitterionic polymer, namely dextran with carboxybetaine modified by methacrylate (Dex-CB-MA), as an interfacial layer to improve the film morphology of the CH3NH3PbI3 photoactive layer and the interfacial contact between the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) hole extraction layer and CH3NH3PbI3 photoactive layer. It is found that the Dex-CB-MA thin layer forms a better band alignment between the PEDOT:PSS hole extraction layer and CH3NH3PbI3 photoactive layer, and improves the crystallization of the CH3NH3PbI3 photoactive layer, resulting in efficient charge carrier transport. As a result, perovskite solar cells with the PEDOT:PSS/Dex-CB-MA hole extraction layer exhibit more than 30% enhancement in efficiency and dramatically boosted stability as compared with that with the PEDOT:PSS hole extraction layer. Our studies provide an effective and facile way to fabricate stable perovskite solar cells with high power conversion efficiency.

Graphical abstract: A zwitterionic polymer as an interfacial layer for efficient and stable perovskite solar cells

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Supplementary files

Article information


Submitted
28 Jun 2019
Accepted
26 Aug 2019
First published
25 Sep 2019

This article is Open Access

RSC Adv., 2019,9, 30317-30324
Article type
Paper

A zwitterionic polymer as an interfacial layer for efficient and stable perovskite solar cells

S. Zhou, T. Zhu, L. Zheng, D. Zhang, W. Xu, L. Liu, G. Cheng, J. Zheng and X. Gong, RSC Adv., 2019, 9, 30317
DOI: 10.1039/C9RA04907J

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