Flexible ambipolar organic field-effect transistors with reverse-offset-printed silver electrodes for a complementary inverter

Title
Flexible ambipolar organic field-effect transistors with reverse-offset-printed silver electrodes for a complementary inverter
Authors
Junsu ParkMinseok KimSeung-Won YeomHyeon Jun HaHyenggun Song전영민Yun-Hi KimByeong-Kwon Ju
Keywords
organic FET; ambipolar
Issue Date
2016-04
Publisher
Nanotechnology
Citation
VOL 27, 1-11
Abstract
We report ambipolar organic field-effect transistors and complementary inverter circuits with reverse-offset-printed (ROP) Ag electrodes fabricated on a flexible substrate. A diketopyrrolopyrrole-based co-polymer (PDPP-TAT) was used as the semiconductor and poly(methyl methacrylate) was used as the gate insulator. Considerable improvement is observed in the n-channel electrical characteristics by inserting a cesium carbonate (Cs2CO3) as the electron-injection/hole-blocking layer at the interface between the semiconductors and the electrodes. The saturation mobility values are 0.35 cm(2) V(-1) s(-1) for the p-channel and 0.027 cm(2) V(-1) s(-1) for the n-channel. A complementary inverter is demonstrated based on the ROP process, and it is selectively controlled by the insertion of Cs2CO3 onto the n-channel region via thermal evaporation. Moreover, the devices show stable operation during the mechanical bending test using tensile strains ranging from 0.05% to 0.5%. The results confirm that these devices have great potential for use in flexible and inexpensive integrated circuits over a large area.
URI
http://pubs.kist.re.kr/handle/201004/58869
ISSN
09574484
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KIST Publication > Article
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