Schottky gate static induction transistor using copper phthalocyanine films

High‐Performance, Vertical‐Type Organic Transistors with Built‐In Nanotriode Arrays

“…SITs were first developed using inorganic semiconductors, [5] and they have only recently been used with organic semiconductors. [6][7][8][9][10][11][12] When fabricating solid-state triodes based on organic semiconductors, it is necessary to embed a stripe or mesh gate electrode, which corresponds to a grid electrode in a vacuum triode, in the organic layer. It is important that the fine mesh structure of a gate electrode be fabricated to effectively modulate the potential barrier height against the carrier flow and to improve the transistor characteristics.…”

High-current operation of vertical-type organic transistor with preferentially oriented molecular film

“…The observed J DS was extremely high compared with those of other vertical-type organic transistors. [16][17][18][19][20][21][22][23][24][25][26] The gate current density (J G ) also increased with increasing V DS ; however, the observed J G was three orders of magnitude lower than J DS . Carriers cannot be injected in a gate electrode with increasing positive gate voltage unless the gate voltage exceeds the breakdown voltage.…”

“…5,9,10 In addition to planar OTFTs, vertical-type organic transistors have been reported in recent years. [15][16][17][18][19][20][21][22][23][24][25][26] The vertical structure is considered promising for attaining high-current and low-voltage operation, in which the carriers flow across the thin film in the vertical direction, perpendicular to the film plane, with short channel paths having lengths corresponding to the semiconductor film thickness. Several groups have reported vertical-type organic transistors such as polymer grid transistors, organic a Email: fukagawa.h-fe@nhk.or.jp b Present address: Tokyo University of Science, Suwa, 5000-1 Toyohira, Chino-city, Nagano, 391-0292, Japan c Present address: Tohoku University, 6-6-05 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-8579, Japan d Present address: Yamagata University, Research Center for Organic Electronics, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan static induction transistors (SITs), metal-base organic transistors (MBOTs), space-charge-limited transistors (SCLTs), patterned electrode vertical organic field effect transistor (PE-VOFET) and permeable-base transistor (PMBT) to realize a short channel.…”

“…Several groups have reported vertical-type organic transistors such as polymer grid transistors, organic a Email: fukagawa.h-fe@nhk.or.jp b Present address: Tokyo University of Science, Suwa, 5000-1 Toyohira, Chino-city, Nagano, 391-0292, Japan c Present address: Tohoku University, 6-6-05 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-8579, Japan d Present address: Yamagata University, Research Center for Organic Electronics, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan static induction transistors (SITs), metal-base organic transistors (MBOTs), space-charge-limited transistors (SCLTs), patterned electrode vertical organic field effect transistor (PE-VOFET) and permeable-base transistor (PMBT) to realize a short channel. [15][16][17][18][19][20][21][22][23][24][25][26] However, the relationship between the crystalline axis of the organic film and the carrier transport direction has not been examined for vertical-type organic transistors. If the planar molecules are oriented with the molecular plane parallel to the substrate in a vertical-type organic transistor, the carrier transport direction can easily be aligned with the π-π stacking direction of the organic film.…”

“…Copper phthalocyanine (CuPc) has typically been used in vertical-type organic transistors; however, the performance of CuPc-based transistors is low. 16 The reasons for this are that CuPc molecules are oriented horizontally only in the thin-film region and the HOMO of CuPc does not show energy band dispersion in the thin film. 38,39 In contrast, BTQBT has a strong intermolecular interaction perpendicular to the substrate and forms a highly ordered thick film on a variety of substrates.…”