Regioregular and Random Difluorobenzothiadiazole Electron Donor-Acceptor Polymer Semiconductors for Thin-Film Transistors and Polymer Solar Cells

Ping Deng, Bo Wu, Yanlian Lei, Huanyang Cao, Beng ONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Random and regioregular electron donor-acceptor (D-A) polymers comprising of 3,6-bis(3-octyltridecyl)thieno[3,2-b]thiophene donor and 5,6-difluorobenzo[c][1,2,5]thiadiazole acceptor moieties were synthesized to study the effects of both structural regioregularity and molecular weight on their performance in organic thin-film transistors (OTFTs) and bulk-heterojunction (BHJ) polymer solar cells (PSCs). All the polymers displayed similar molecular orbital energy levels regardless of their structures and molecular weights (MWs). The regioregular D-A polymers exhibited higher molecular orders than their random counterparts, and the degrees in molecular ordering improved with increased MW, leading to higher charge transport capability. However, undesirably high MW led to limited polymer solubility and thus fabrication difficulties resulting in poorer device performance. A reasonably high power conversion efficiency of about 7.6% was provided by the new regioregular D-A polymer semiconductor of mid-MW properties with excellent solution processability and molecular self-assembly efficiency.

Original languageEnglish
Pages (from-to)2541-2548
Number of pages8
JournalMacromolecules
Volume49
Issue number7
DOIs
Publication statusPublished - 26 Apr 2016

Scopus Subject Areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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