A universal layer-by-layer solution-processing approach for efficient non-fullerene organic solar cells

Layer-by-layer (LbL) solution processing is a cost-effective technology for the large-scale fabrication of organic solar cells (OSCs). In this work, LbL OSCs were fabricated using PTQ10/J71 as donors and ITC6-IC/IDIC/MeIC/ITCPTC/ITIC as non-fullerene acceptors (NFAs) without using orthogonal solvent...

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Bibliographic Details
Published in:Energy & environmental science 2019-01, Vol.12 (1), p.384-395
Main Authors: Sun, Rui, Guo, Jing, Sun, Chenkai, Wang, Tao, Luo, Zhenghui, Zhang, Zhuohan, Jiao, Xuechen, Tang, Weihua, Yang, Chuluo, Li, Yongfang, Min, Jie
Format: Article
Language:English
Subjects:
Absorption spectra
Charge efficiency
Charge transport
Donors (electronic)
Energy conversion efficiency
Energy dissipation
Energy loss
Fabrication
Fullerenes
Heterojunctions
Industrial production
Organic chemistry
Phase separation
Photovoltaic cells
Photovoltaics
Solar cells
Solvents
Technology
Vertical separation
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Summary:Layer-by-layer (LbL) solution processing is a cost-effective technology for the large-scale fabrication of organic solar cells (OSCs). In this work, LbL OSCs were fabricated using PTQ10/J71 as donors and ITC6-IC/IDIC/MeIC/ITCPTC/ITIC as non-fullerene acceptors (NFAs) 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), which had the advantages of reduced energy loss, stronger absorption spectra, better vertical phase separation, partially increased charge transport property and charge collection efficiency. Furthermore, taking the J71/ITC6-IC and PTQ10/IDIC LbL systems as examples, we fabricated large-area LbL OSCs using the doctor-blading process, which is closer 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 cm 2 demonstrated encouraging PCEs of over 10%, which is the record efficiency for large-area LbL OSCs reported in the literature to date. Our work indicates that the solution-processed LbL approach not only presents good generality and high device performance, but also is a superior alternative to the BHJ method for the initial evaluation of photovoltaic materials and the industrial production of R2R OSCs. A universal layer-by-layer solution-processing approach is proven to be effective for the fabrication of high-performance non-fullerene organic solar cells.
ISSN:1754-5692
1754-5706
DOI:10.1039/c8ee02560f