Dithienobenzochalcogenodiazole-based electron donor-acceptor polymers for organic electronics

Amsalu Efrem, Yanlian Lei, Bo Wu, Mingfeng Wang*, Siu Choon Ng, Beng ONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Appositely functionalized dithienobenzo-thiadiazole and dithienobenzo-oxadiazole-monomers were prepared and used in the synthesis of conjugated electron donor-acceptor (D-A) polymers. Detailed systematic investigations were carried out to study the effects of chalcogen atoms and three donor units on the optical and electrochemical properties as well as photovoltaic and field-effect transistor performance of the D-A polymers. All polymers displayed good thermal properties. Polymers containing benzooxadiazole moiety showed deeper LUMO levels as compared to their benzothiadiazole-containing analogues, whereas those derived from weak donor unit exhibited deeper HOMO levels than those with stronger donors. Photovoltaic power conversion efficiency of over 2% and hole field-effect mobility of 2.6 × 10-2 cm2V-1s-1 and on/off ratio of over 105 were obtained. These results demonstrate that dithienobenzo-chalcogenodiazole structures are potentially useful electron acceptor building blocks for the construction of D-A polymers for organic electronics applications.

Original languageEnglish
Pages (from-to)90-99
Number of pages10
JournalDyes and Pigments
Volume129
DOIs
Publication statusPublished - 1 Jun 2016

Scopus Subject Areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Dithienobenzochalcogenodiazole
  • Electron donor-acceptor polymers
  • Field-effect mobility
  • Field-effect transistors
  • Organic photovoltaics

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