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Improved Efficiency in Fullerene and Non-fullerene Polymer Solar Cells having an Interdigitated Interface with the Electron Transport Layer

Abstract

We report the improved efficiency in fullerene and non-fullerene polymer solar cells utilizing an interdigitated interface between the photoactive layer and the PFN-OX electron transport layer (ETL). This interdigitated interface is formed in-situ during the solution casting process of photoactive layer on the blend films made of electron-transporting PFN-OX and template materials of either semi-conducting 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene) -indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2’,3’-d’]-s-indaceno[1,2-b:5,6-b’]dithiophene) (ITIC) or insulating polystyrene (PS). Compared to the devices having a planar interface between PFN-OX and the photoactive layer, devices with an interdigitated interface templated by ITIC increased the efficiency of PTB7-Th:PC71BM solar cells from 9.27% to 10.42%, with that device having an interdigitated interface templated by PS receiving a PCE of 9.94%. PTB7-Th:ITIC non-fullerene solar cells employing this ITIC-templated interdigitated PFN-OX ETL received an enhanced PCE from 7.43% to 8.34%. Interfacial charge transport studies support that favorable electrical doping of PFN-OX to ITIC as well as charge transfer between PTB7-Th and ITIC contribute to this superior efficiency enhancement in devices employing an ITIC-templated interdigitated PFN-OX ETL. This work provides a new strategy on constructing novel ETL to prepare high efficiency polymer solar cells.

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Publication details

The article was accepted on 07 Aug 2018 and first published on 09 Aug 2018


Article type: Research Article
DOI: 10.1039/C8QM00347E
Citation: Mater. Chem. Front., 2018, Accepted Manuscript
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    Improved Efficiency in Fullerene and Non-fullerene Polymer Solar Cells having an Interdigitated Interface with the Electron Transport Layer

    Y. Yan, W. Li, J. Cai, M. Chen, Y. Mao, X. Chen, R. Gurney, D. Liu, F. Huang and T. Wang, Mater. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QM00347E

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