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A Universal Layer-by-Layer Solution-Processing Approach for Efficient Non-fullerene Organic Solar Cells

Abstract

Layer-by-layer (LbL) solution processing is a cost-effective technology for large scale fabrication of organic solar cells (OSCs). In this work, the LbL OSCs were fabricated using PTQ10/J71 as donors and ITC6-IC/IDIC/MeIC/ITCPTC/ITIC as non-fullerene acceptors (NFAs), respectively, without using orthogonal solvents and appropriate co-solvents. Compared with traditional bulk heterojunction (BHJ) OSCs, the corresponding solution-processed LbL devices exhibited higher or comparable power conversion efficiencies (PCEs), benefitted from the slightly reduced energy losses, stronger absorption spectra, better vertical phase separation, partially increased charge transport property and charge collection efficiency, etc. Furthermore, taking J71/ITC6-IC and PTQ10/IDIC LbL systems as examples, we fabricated large area LbL OSCs using doctor-blading process, which is more closing to the roll-to-roll (R2R) technology. Importantly, both OSCs based on J71/ITC6-IC and PTQ10/IDIC LbL with an active area of 1.00 cm2 demonstrated encouraging PCEs of over 10%, which is the record efficiency of the large-area LbL OSCs reported in literatures so far. Our work demonstrates that the solution-processed LbL approach not only presents good generality and high device performance, but also is a superior alternative to BHJ method for initial evaluation of photovoltaic materials as well as industrial production of R2R OSCs.

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Publication details

The article was received on 03 Sep 2018, accepted on 07 Dec 2018 and first published on 08 Dec 2018


Article type: Paper
DOI: 10.1039/C8EE02560F
Citation: Energy Environ. Sci., 2019, Accepted Manuscript
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    A Universal Layer-by-Layer Solution-Processing Approach for Efficient Non-fullerene Organic Solar Cells

    J. Min, R. Sun, J. Guo, C. Sun, T. wang, Z. Luo, Z. Zhang, X. Jiao, W. Tang, C. Yang and Y. Li, Energy Environ. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C8EE02560F

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