Nonhalogen Solvent-Processed Asymmetric Wide-Bandgap Polymers for Nonfullerene Organic Solar Cells with Over 10% Efficiency

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

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Author(s)

  • Yongkang An
  • Xunfan Liao
  • Lie Chen
  • Jingping Yin
  • Qingyun Ai
  • Qian Xie
  • Bin Huang
  • Feng Liu
  • Yiwang Chen

Related Research Unit(s)

Detail(s)

Original languageEnglish
Journal / PublicationAdvanced Functional Materials
Volume28
Issue number16
Online published20 Feb 2018
Publication statusPublished - 18 Apr 2018

Abstract

Two new wide-bandgap D–A–π copolymer donor materials, PBDT-2TC and PBDT-S-2TC, based on benzodithiophene and asymmetric bithiophene with one carboxylate (2TC) substituent are synthesized by a facile approach for fullerene-free organic solar cells (OSCs). The combination of one carboxylate-substituted thiophene with one thiophene bridge in the backbone substantially reduces the steric hindrance, thereby favoring a planar geometry for efficient charge transport and molecular packing. A reasonable highest-occupied-molecular-orbital energy level in relation to that of the acceptor and balanced hole and electron transport are observed for both polymers. This asymmetric structure unit is flexible and versatile, allowing the absorption, energy levels, and morphology of the blend films to be tailored. Fullerene-free OSCs based on PBDT-S-2TC:ITIC achieve a high power conversion efficiency of 10.12%. More impressively, a successful nonhalogen solvent-processed solar cell with 9.55% efficiency is also achieved, which is one of the highest values for a fullerene-free OSC processed using an ecofriendly solvent.

Research Area(s)

  • asymmetric units, nonfullerenes, nonhalogen process, organic solar cells

Citation Format(s)

Nonhalogen Solvent-Processed Asymmetric Wide-Bandgap Polymers for Nonfullerene Organic Solar Cells with Over 10% Efficiency. / An, Yongkang; Liao, Xunfan; Chen, Lie; Yin, Jingping; Ai, Qingyun; Xie, Qian; Huang, Bin; Liu, Feng; Jen, Alex K.-Y.; Chen, Yiwang.

In: Advanced Functional Materials, Vol. 28, No. 16, 18.04.2018.

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