Abstract
We have investigated that the stability of organic field-effect transistors (OFETs) based on two oligo- p-phenylenevinylenes, 1,4-bis(4-methylstyryl)benzene (CH3-OPV) and 1,4-bis(4-dimethylaminostyryl)benzene [(CH3)2N-OPV], which is a new organic semiconductor for OFETs. The OFET fabricated using CH3-OPV with a highest occupied molecular orbital (HOMO) energy level of -5.55 eV shows good ambient stability even after storage in air for one year. On the other hand, the field-effect mobilities of organic semiconductors including (CH3)2N-OPV with the HOMO energy level ranging from -4.94 to -5.20 eV have decreased with time. The stability of CH3-OPV is suggested to be due to the relatively low HOMO energy level.
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