Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 24, Pages 13431-13439Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b02265
Keywords
conjugated polymer; diketopyrrolopyrrole; epitaxy; alignment; thin-film transistor
Funding
- National Research Foundation of Korea [NRF2012R1A2A1A01008797]
- Key Research Institute Program [NRF201200020209]
- MCubed
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, as part of the Center for Solar and Thermal Energy Conversion in Complex Materials, an Energy Frontier Research Center [DE-SC0000957]
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Diketopyrrolopyrrole (DPP)-based conjugated polymer PDTDPPQT was synthesized and was used to perform epitaxial polymer crystal growth on removable 1,3,5-trichlorobenzene crystallite templates. A thin-film transistor (TFT) was successfully fabricated in well-grown large spherulites of PDTDPPQT. The charge carrier mobility along the radial direction of the spherulites was measured to be 5.46-12.04 cm(2) V-1 s(-1), which is significantly higher than that in the direction perpendicular to the radial direction. The dynamic response of charge transport was also investigated by applying a pulsed bias to TFTs loaded with a resistor (similar to 20 M Omega). The charge-transport behaviors along the radial direction and perpendicular to the radial direction were investigated by static and dynamic experiments through a resistor-loaded (RL) inverter. The RL inverter made of PDTDPPQT-based TFT operates well, maintaining a fairly high switching voltage ratio (V-out(ON)/V-out(OFF)) at a relatively high frequency when the source-drain electrodes are aligned parallel to the radial direction.
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