[9a-Z11-1~13] 12.4 Organic light-emitting devices and organic transistors

△ [9a-Z11-10] Meniscus-controlled printing of single-crystal semiconductor on highly hydrophobic surfaces and extremely sharp-switching TFT operation

〇(D)Gyo Kitahara¹, Satoru Inoue¹, Toshiki Higashino², Mitsuhiro Ikawa¹, Satoshi Matsuoka¹, Shunto Arai¹, Tatsuo Hasegawa¹ (1.Univ. Tokyo, 2.AIST)

Keywords:organic semiconductor, thin-film transistors, printed electronics

We conducted printing of single-crystal semiconductor layers on top of highly hydrophobic gate dielectric polymer, Cytop^®, which is effective for improving switching characteristics of thin-film transistors. We observed that the metal-film area patterned on Cytop layer acts as hydrophilic region and helps semiconductor solution become wettable even on Cytop surface, thus leading to successful single-crystalline film formation. The obtained Cytop/semiconductor interface affords highly sharp subthreshold swing (67 mV/dec on average), which can be ascribed to the effective elimination of carrier trap states on the interface.