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Reduced bilateral recombination by functional molecular interface engineering for efficient inverted perovskite solar cells

Li, Bowei, Xiang, Yuren, Imalka Jayawardena, K.D.G., Luo, Deying, Wang, Zhuo, Yang, Xiaoyu, Watts, John F., Hinder, Steven, Sajjad, Muhammad T., Webb, Thomas , Luo, Haitian, Marko, Igor, Li, Hui, Thomson, Stuart A.J., Zhu, Rui, Shao, Guosheng, Sweeney, Stephen J., Silva, S. Ravi P. and Zhang, Wei (2020) Reduced bilateral recombination by functional molecular interface engineering for efficient inverted perovskite solar cells Nano Energy, 105249.

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Abstract

Interface-mediated recombination losses between perovskite and charge transport layers are one of the main reasons that limit the device performance, in particular for the open-circuit voltage (VOC) of perovskite solar cells (PSCs). Here, functional molecular interface engineering (FMIE) is employed to retard the interfacial recombination losses. The FMIE is a facile solution-processed means that introducing functional molecules, the fluorene-based conjugated polyelectrolyte (CPE) and organic halide salt (OHS) on both contacts of the perovskite absorber layer. Through the FMIE, the champion PSCs with an inverted planar heterojunction structure show a remarkable high VOC of 1.18 V whilst maintaining a fill factor (FF) of 0.83, both of which result in improved power conversion efficiencies (PCEs) of 21.33% (with stabilized PCEs of 21.01%). In addition to achieving one of the highest PCEs in the inverted PSCs, the results also highlight the synergistic effect of these two molecules in improving device performance. Therefore, the study provides a straightforward avenue to fabricate highly efficient inverted PSCs.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Li, Boweibowei.li@surrey.ac.uk
Xiang, Yureny.xiang@surrey.ac.uk
Imalka Jayawardena, K.D.G.
Luo, Deying
Wang, Zhuo
Yang, Xiaoyu
Watts, John F.J.Watts@surrey.ac.uk
Hinder, StevenS.Hinder@surrey.ac.uk
Sajjad, Muhammad T.
Webb, Thomasthomas.webb@surrey.ac.uk
Luo, Haitian
Marko, IgorI.Marko@surrey.ac.uk
Li, Huihl0024@surrey.ac.uk
Thomson, Stuart A.J.
Zhu, Rui
Shao, Guosheng
Sweeney, Stephen J.
Silva, S. Ravi P.
Zhang, Weiwz0003@surrey.ac.uk
Date : 4 August 2020
Funders : EPSRC, Marie Skłodowska-Curie Actions Individual Fellowships, China Scholarship Council (CSC), European Commission H2020 CORNET, Equal Opportunities Foundation Hong Kong, National Key Research and Development Program of China
DOI : 10.1016/j.nanoen.2020.105249
Grant Title : EPSRC New Investigator Award
Copyright Disclaimer : © 2020 The Authors. Published by Elsevier Ltd.
Uncontrolled Keywords : Inverted perovskite solar cells Non-radiative recombination Functional molecules Interface engineering
Additional Information : Embargo OK Metadata Pending Proof version of article online. Awaiting final published version.
Depositing User : James Marshall
Date Deposited : 13 Aug 2020 15:06
Last Modified : 13 Aug 2020 15:06
URI: http://epubs.surrey.ac.uk/id/eprint/858407

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