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    Versatile Device Architectures for High-Performing Light-Soaking-Free Inverted Polymer Solar Cells

    Year: 2017

    Journal: ACS Appl. Mater. Interfaces, Volume 9, SEP 27, page 32678–32687

    Authors: Yan, Yu; Cai, Feilong; Yang, Liyan; Li, Wei; Gong, Yanyan; Cai, Jinlong; Liu, Shuang; Gurney, Robert S.; Liu, Dan; Wang, Tao

    Organizations: National Natural Science Foundation of China [21504065, 21774097]; Fundamental Research Funds for the Central Universities of China [WUT: 20171VA002]; Recruitment Program of Global Experts (1000 Talents Plan) of China

    Keywords: polymer solar cells; light-soaking; TiO2; PEI; PFN-OX

    Metal oxide charge transport layers have been widely employed to prepare inverted polymer solar cells with high efficiency and long lifetime. However, the intrinsic defects in the metal oxide layers, especially those prepared from low-temperature routes, overshadow the high efficiency that can be achieved and also introduce light-soaking issues to these devices. In this work, we have employed polyethyleneimine (PEI) and poly(9,9-bis(6'-(N,N-diethylamino)propyl)-fluorene-alt-9,9-bis-(3-ethyl(oxetane-3-ethyloxy)-hexyl)-fluorene] (PFN-OX) to modify our low-temperature-processed TiO2 electron transport layer (ETL) and demonstrated that the light-soaking issue can be effectively eliminated by PEI modifications because of the formation of abundant dipole moments, whereas PFN-OX was ineffective as a result of deficient dipole moments at the interface. Excitingly, PEI modifications enable versatile device architectures to obtain light-soaking-free, inverted PTB7-Th:PC71BM solar cells with efficiencies of over 10%, by adding PEI either in the bulk or as an adjacent layer below or above the TiO2 ETL.
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