Regio-asymmetric polymers based on fluorinated benzothiadiazole-benzodithiophene for polymer solar cells with a high open-circuit voltage

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

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Author(s)

  • Yahui Tong
  • Hua Wang
  • Yuying Hao

Detail(s)

Original languageEnglish
Pages (from-to)3801-3809
Journal / PublicationNew Journal of Chemistry
Volume43
Issue number9
Online published25 Jan 2019
Publication statusPublished - 7 Mar 2019

Abstract

Two regio-asymmetric polymers PR2F and PR1F with three repeat units A-D-A, π-D-A, and π-D-π along the polymer backbone were obtained by polymerizing different fluorinated benzothiadiazole-thiophene units, FBT-T and 2FBT-T units (A-π), with a benzodithiophene unit (D), respectively. Here, the new regio-asymmetric polymers were different from traditional polymers featuring a D-A or D-π-A-π backbone. Both the regio-asymmetric polymers showed a low lying HOMO energy level in relation to that of the PC61BM acceptor and then a high open-circuit voltage of ∼1 V was observed in both PR2F and PR1F devices. Bulk-heterojunction devices based on PR2F with difluorinated BT exhibited an appreciable power conversion efficiency (PCE) of 4.73% due to the relatively high and balanced charge carrier mobilities, while the mono-fluorinated BT polymer PR1F-based devices showed a lower PCE of 2.92%. These results indicate that the regio-asymmetric conjugated polymers are a promising class of materials for polymer solar cell applications, and it is significant to further understand the influence of the polymer structure on the optoelectronic properties.

Citation Format(s)

Regio-asymmetric polymers based on fluorinated benzothiadiazole-benzodithiophene for polymer solar cells with a high open-circuit voltage. / Li, Zhanfeng; Liu, Caijun; Gan, Guoyue et al.
In: New Journal of Chemistry, Vol. 43, No. 9, 07.03.2019, p. 3801-3809.

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