Bilayer Ambipolar Organic Thin-Film Transistors and Inverters Prepared by the Contact-Film-Transfer Method

Ambipolar organic thin-film transistors with a bilayer structure of poly(3-hexylthiophene) and [6,6]phenyl C-61 butyric acid methyl ester were fabricated using a simple solution-based, contact-film-transfer method. The transistors exhibited balanced electron and hole mobilities of 2.1 X 10(-2) and 1.1 x 10(-2) cm(2) V-1 s(-1), respectively. Complementary inverters based on two identical ambipolar transistors showed good performance with a gain of 14.