[21a-B32-1~9] 12.4 Organic light-emitting devices and organic transistors

▼ [21a-B32-1] Alignment-Induced Mobility Enhancement and Small Device-to-Device Variation of Polymer-Based Organic Field-Effect Transistors with Highly Hydrophobic Nano-Grooved Gate Dielectric Surfaces

〇Kirill Dmitrievich Bulgarevich^1,2, Kenji Sakamoto¹, Takeo Minari¹, Takeshi Yasuda¹, Kazushi Miki³, Masayuki Takeuchi^1,2 (1.NIMS, 2.Univ. Tsukuba, 3.Univ. Hyogo)

Keywords:polymer organic semiconductors, molecular orientation control, nano-grooves

Polymer-based organic field-effect transistors (OFETs) showing alignment-induced mobility enhancement and very small device-to-device variation have been fabricated. The active layer was a terrace-phase poly(2,5-bis(3-hexadecylthiophene-2-yl)thieno[3,2-b]thiophene) (pBTTT-C16) film aligned by a highly hydrophobic nano-grooved gate dielectric surface. Formation of a pBTTT-C16 film on such a highly hydrophobic surface by spin coating was allowed by patterning the surface properly with hydrophobic and hydrophilic areas. The charge transport anisotropy of about 5 and the alignment-induced mobility enhancement by a factor of about 2 were successfully achieved. The device-to-device variation was very small. Remarcably, the transfer characteristics of 30 OFETs were almost identical. The effect of the nano-grooves on the operational stability of the OFETs was also investigated.