Post‐Treatment‐Free Main Chain Donor and Side Chain Acceptor (D‐s‐A) Copolymer for Efficient Nonfullerene Solar Cells with a Small Voltage Loss. Issue 7 (5th February 2018)

• Record Type: Journal Article
• Authors: Liao, Zhihui; Wang, Yilin; An, Yongkang; Tan, Yun; Meng, Xiangchuang; Wu, Feiyan; Chen, Lie; Chen, Yiwang
• Is Part Of: Macromolecular rapid communications. Volume 39:Issue 7(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-02-05
• Subjects: copolymers -- energy loss -- main chain donors -- no‐fullerene solar cells -- side chain acceptors; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201700706
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract: Main chain donor and side chain acceptor (D‐ s ‐A) copolymers are an important branch of the D–A copolymer family. However, the development of D‐ s ‐A copolymers significantly falls behind the alternative D–A copolymers, especially for organic solar cells, because a breakthrough in device performance is not yet obtained with a reported power conversion efficiency (PCE) of 2%–4%. Herein, a newly developed D‐ s ‐A copolymerPDRCNBDT, bearing 2‐(1, 1‐dicyanomethylene) rhodanine pendant group as the donor material, delivers a high PCE of 5.3% for nonfullerene solar cells. To the best of our knowledge, this is the best value reported for D‐ s ‐A copolymers to date. The improved PCE is observed to be associated with a very small energy loss ( E loss ) of 0.57 eV, accompanied by a high open‐circuit voltage ( V oc ) of 1.015 eV. It is important to note that this efficient D‐ s ‐A copolymer is employed in organic solar cells (OSCs), free of additive and annealing treatments. Abstract : Main chain donor and side chain acceptor (D‐ s ‐A) copolymers bearing 2‐(1, 1‐dicyanomethylene) rhodanine pendant group, a newly developed D‐ s ‐A copolymerPDRCNBDT as a donor material, deliver a record power conversion efficiency of 5.3% with a low energy loss of 0.57 eV for nonfullerene solar cells. This is the best value reported for D‐ s ‐A copolymers to date.