End-chain effects of non-fullerene acceptors on polymer solar cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

12 Scopus Citations
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Author(s)

  • Lu-Ming Tang
  • Jingyang Xiao
  • Wei-Yun Bai
  • Qing-Ya Li
  • Hua-Chun Wang
  • Mao-Sheng Miao
  • Yun-Xiang Xu

Detail(s)

Original languageEnglish
Pages (from-to)1-6
Journal / PublicationOrganic Electronics
Volume64
Online published9 Oct 2018
Publication statusPublished - Jan 2019
Externally publishedYes

Abstract

Four acceptor1-acceptor2-donor-acceptor2-acceptor1 (A1-A2-D-A2-A1) structural electron acceptors with different end-chains were designed and synthesized which all possessed indacenodithiophene (IDT) core, benzothiadiazole (BT) bridge as acceptor2, and rhodanine (R) end groups as acceptor1. The non-fullerene acceptor attached with ethyl group is called IDT-BT-R2 and used as control compound. And the other three of them are attached with methoxymethyl, trifluoroethyl and 1-piperidino groups generating IDT-BT-RO, IDT-BT-RF3 and IDT-BT-RN, respectively. The influence of end-chains on their optoelectronic properties were compared between four non-fullerene acceptors. Compared with IDT-BT-R2, the molecule IDT-BT-RF3 show red-shifted light absorption and lower LUMO level because of the electron withdrawing property of fluorine atoms. OSCs based on IDT-BT-RF3 display more efficient charge separation and lower degree of monomolecular recombination, allowing OSCs to show higher short-circuit current (Jsc) than the system of IDT-BT-R2. OSCs based on IDT-BT-RO also show more efficient charge separation and less monomolecular recombination. Due to the elevated LUMO level of the acceptor IDT-BT-RN, organic solar cells (OSCs) utilizing this material as acceptor display high open-circuit voltage (Voc) of 1.10 eV and low energy loss of 0.49 eV when maintaining a relatively high power conversion efficiency (PCE) of 7.09%. We demonstrated that the end-chain engineering could finely tune the light absorption properties and energy levels of novel non-fullerene acceptors and eventually improved OSCs performance can be harvested.

Research Area(s)

  • Charge recombination, End-chains, Heteroatom, Non-fullerene, Polymer solar cells

Citation Format(s)

End-chain effects of non-fullerene acceptors on polymer solar cells. / Tang, Lu-Ming; Xiao, Jingyang; Bai, Wei-Yun; Li, Qing-Ya; Wang, Hua-Chun; Miao, Mao-Sheng; Yip, Hin-Lap; Xu, Yun-Xiang.

In: Organic Electronics, Vol. 64, 01.2019, p. 1-6.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review