Abstract
The microstructure and charge transport properties of binary blends of regioregular (rr) and regiorandom (RRa) poly(3-hexylthiophene) (P3HT) are investigated. X-ray diffraction of the blended films is consistent with a vertically separated structure, with rr-P3HT preferentially crystallizing at the semiconductor/dielectric interface. Thin film transistors made with these blended films preserve high field effect mobility with rr-P3HTcontent as low as 5.6%. In these dilute blends, we estimate that the thickness of rr-P3HT in the channel is only a few nanometers. Significantly, as a result of such an ultrathin active layer at the interface, short channel effects due to bulk currents are eliminated, suggesting a new route to fabricate high-performance, short-channel, and reliable organic electronic devices.
Original language | English (US) |
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Pages (from-to) | 2342-2346 |
Number of pages | 5 |
Journal | ACS Applied Materials and Interfaces |
Volume | 5 |
Issue number | 7 |
DOIs | |
State | Published - Apr 10 2013 |
Keywords
- charge transport
- conjugated polymers
- interface
- organic electronics
- thin-film-transistors
ASJC Scopus subject areas
- General Materials Science