A distorted lactam unit with intramolecular hydrogen bonds as the electron donor of polymer solar cells

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

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Author(s)

  • Hua-Chun Wang
  • Minrun Ren
  • Jian Cao
  • Hong-Bo Yin
  • Guichuan Zhang
  • Jingyang Xiao
  • Xiancheng Ren
  • Yun-Xiang Xu

Detail(s)

Original languageEnglish
Pages (from-to)12290-12296
Journal / PublicationJournal of Materials Chemistry C
Volume7
Issue number39
Online published18 Sep 2019
Publication statusPublished - 21 Oct 2019
Externally publishedYes

Abstract

A novel distorted lactam motif, namely 4,4′-dialkyl-[6,6′-bithieno[3,2-b]pyridine]-5,5′(4H,4′H)-dione (BTP), could lock itself by intramolecular hydrogen bonds. In view of the potential of the motif, two D-A conjugated polymers, PBDT-BTP-HD and PBDT-BTP-OD, with two different long side chains consisting of 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDT) as a donor unit and BTP as an acceptor unit were designed and synthesized. Furthermore, the photophysical, electrochemical and photovoltaic properties of both polymers were investigated. The morphologies and molecular ordering of the neat polymers and blend films were also probed to relate the side chain structures with aggregation states and device parameters. The device based on PBDT-BTP-OD with IT-M exhibited a power conversion efficiency of up to 9.54% thanks to the synergistic effect of the building blocks and side-chain engineering. As a result, it is successfully demonstrated that the novel distorted lactam BTP is a promising building block in organic solar cells.

Citation Format(s)

A distorted lactam unit with intramolecular hydrogen bonds as the electron donor of polymer solar cells. / Wang, Hua-Chun; Ren, Minrun; Cao, Jian; Yin, Hong-Bo; Zhang, Guichuan; Xiao, Jingyang; Ren, Xiancheng; Yip, Hin-Lap; Xu, Yun-Xiang.

In: Journal of Materials Chemistry C, Vol. 7, No. 39, 21.10.2019, p. 12290-12296.

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