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Amino-Functionalized Conjugated Polymer Electron Transport layers Enhances UV-Photostability of Planar Heterojunction Perovskite Solar Cells

Abstract

In this work, we report, for the first time, a solution-processed amino-functionalized copolymer semiconductor (PFN-2TNDI) with a conjugated backbone composed of fluorine, naphthalene diimide, and thiophene spacers as the electron transporting layer (ETL) in the n-i-p planar structured perovskite solar cells. Using this copolymer semiconductor in conjunction with a planar n-i-p heterojunction, we achieved an unprecedented efficiency of ~17% under standard illumination test conditions. More importantly, the perovskite devices using this polymer ETL have shown good stability under constant ultra violet (UV) light soaking during 3000 h of accelerated tests. Various advanced spectroscopic characterizations including ultrafast spectroscopy, ultra-violet photoelectron spectroscopy and electronic impedance spectroscopy elucidate that the interaction between the functional polymer ETL and perovskite layer plays a critical role on trap passivation, and thus the device UV-photostability. We expect these results will boost the development of low temperature solution-processed organic ETL materials, which is essential for commercialization of high-performance and stable flexible perovskite solar cells.

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Publication details

The article was received on 07 Jan 2017, accepted on 11 Apr 2017 and first published on 19 Apr 2017


Article type: Edge Article
DOI: 10.1039/C7SC00077D
Citation: Chem. Sci., 2017, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Amino-Functionalized Conjugated Polymer Electron Transport layers Enhances UV-Photostability of Planar Heterojunction Perovskite Solar Cells

    D. Li, C. Sun, H. Li, H. Shi, X. Shai, Q. Sun, J. Han, Y. Shen, H. Yip, F. Huang and M. Wang, Chem. Sci., 2017, Accepted Manuscript , DOI: 10.1039/C7SC00077D

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