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 language | English |
|---|---|
| Pages (from-to) | 5264-5274 |
| Number of pages | 11 |
| Journal | ACS Nano |
| Volume | 9 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2015 May 26 |
Keywords
- diketopyrrolopyrrole
- field-effect transistor
- phototransistor
- polymer nanowire
- selenophene
ASJC Scopus subject areas
- Engineering(all)
- Materials Science(all)
- Physics and Astronomy(all)