Dithienothiapyran: An Excellent Donor Block for Building High-Performance Copolymers in Nonfullerene Polymer Solar Cells

Min Deng, Xiaopeng Xu, Young Woong Lee, Han Young Woo, Zhaozhao Bi, Wei Ma, Ying Li, Qiang Peng

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work, a new but excellent donor block dithienothiapyran (DTTP) was developed for constructing highly efficient wide band gap copolymer donors. Compared to dithienopyran (DTP), DTTP features weaken electron-donating ability and more planar-conjugated backbones. Polymer-fluorinated benzotriazole (FBTA) based on DTTP exhibits lower highest occupied molecular orbital level (-5.30 vs -5.21 eV), higher molar extinction coefficient (1.54 × 10 5 vs 8.65 × 10 4 M -1 cm -1 ), and better crystallinity than -FBTA based on DTP, thus producing a higher device performance of 10.51% in binary blend nonfullerene polymer solar cells (NF-PSCs) blended with IT-M. To improve the absorption strength of PDTTP-FBTA: devices in the shorter wavelength range and further optimize the blend morphology, a small molecule of, which has strong absorption at short wavelength (300-600 nm), was incorporated. Finally, the performance of the ternary blends was successfully enhanced to 11.57% and a very high fill factor of 76.5%. Our work provided a new but excellent donor block for building high-performance conjugated copolymers to achieve highly efficient NF-PSCs.

Original languageEnglish
Pages (from-to)3308-3316
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number3
DOIs
Publication statusPublished - 2019 Jan 23

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Copolymers
Wavelength
Fluorocarbon Polymers
Molecular orbitals
Energy gap
Molecules
Electrons
Polymers
Polymer solar cells
benzotriazole

Keywords

  • dithienothiapyran
  • donor building block
  • fullerene-free polymer solar cells
  • ternary blend devices
  • wide band gap copolymer donors

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Dithienothiapyran : An Excellent Donor Block for Building High-Performance Copolymers in Nonfullerene Polymer Solar Cells. / Deng, Min; Xu, Xiaopeng; Lee, Young Woong; Woo, Han Young; Bi, Zhaozhao; Ma, Wei; Li, Ying; Peng, Qiang.

In: ACS Applied Materials and Interfaces, Vol. 11, No. 3, 23.01.2019, p. 3308-3316.

Research output: Contribution to journalArticle

Deng, Min ; Xu, Xiaopeng ; Lee, Young Woong ; Woo, Han Young ; Bi, Zhaozhao ; Ma, Wei ; Li, Ying ; Peng, Qiang. / Dithienothiapyran : An Excellent Donor Block for Building High-Performance Copolymers in Nonfullerene Polymer Solar Cells. In: ACS Applied Materials and Interfaces. 2019 ; Vol. 11, No. 3. pp. 3308-3316.
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