Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 14, Pages 7983-7988Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp300052p
Keywords
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Funding
- MEXT, Japan [22244045, 22850012, 23684028]
- Grants-in-Aid for Scientific Research [22850012, 22540364, 23684028, 23340104, 22244045] Funding Source: KAKEN
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Picene is a phenacene-type aromatic hydrocarbon molecule with five benzene rings. We have fabricated picene single crystal (SC) field-effect transistors (FETs) with solid gate and ionic liquid gate dielectrics. Although the picene SC FET showed a large hole-injection barrier without any modification of interface between source/drain electrodes and picene SC, such a large hole-injection barrier could be effectively reduced by modifying the interface with tetracyanoquinodimethane (TCNQ). Picene SC FET with an HfO2 gate dielectric and TCNQ:coated electrodes shows p-channel characteristics with a smooth hole injection and a field-effect mobility more than 1 cm(2) V-1 s(-1) in two-terminal measurement. Picene SC FET could be operated even in bottom-contact structure by modifying the interface with octanethiol. Furthermore, picene SC FET operated with ionic liquid gate dielectric, [1-butyl-3-methylimidazolium][hexafluorophosphate], showing the field-effect mobility of 1.8 X 10(-1) cm(2) V-1 s(-1) and low absolute value, 1.9 V, of threshold voltage.
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