High aspect ratio conjugated polymer nanowires for high performance field-effect transistors and phototransistors

Hyun Ah Um, Dae Hee Lee, Dong Uk Heo, Da Seul Yang, Jicheol Shin, Hionsuck Baik, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We synthesized a highly crystalline DPP-based polymer, DPPBTSPE, which contained 1,2-bis(5-(thiophen-2-yl)selenophen-2-yl)ethene as a planar and rigid electron donating group. High- and low-molecular weight (MW) DPPBTSPE fractions were collected by Soxhlet extraction and were employed to investigate their unique charge transport properties in macroscopic films and single crystalline polymer nanowire (SC-PNW), respectively. The low-MW polymer could provide well-isolated and high aspect ratio SC-PNWs, in which the direction of π-π stacking was perpendicular to the wire growing axis. The field effect transistors made of SC-PNWs exhibited remarkably high carrier mobility of 24 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup>. In addition, phototransistors (PTs) made of SC-PNW showed very high performance in terms of photoresponsivity (R) and photoswitching ratio (P). The average R of the SC PNW-based PTs were in the range of 160-170 A W<sup>-1</sup> and the maximum R was measured at 1920 A W<sup>-1</sup>, which is almost three orders higher than that of thin film-based PT device.

Original languageEnglish
Pages (from-to)5264-5274
Number of pages11
JournalACS Nano
Volume9
Issue number5
DOIs
Publication statusPublished - 2015 May 26

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Keywords

  • diketopyrrolopyrrole
  • field-effect transistor
  • phototransistor
  • polymer nanowire
  • selenophene

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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