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Yoo, Hocheon; On, Sungmin; Lee, Seon Baek; Cho, Kilwon; Kim, Jae‐Joon
Advanced materials (Weinheim), 07/2019, Letnik: 31, Številka: 29Journal Article
Multivalued logic (MVL) computing could provide bit density beyond that of Boolean logic. Unlike conventional transistors, heterojunction transistors (H‐TRs) exhibit negative transconductance (NTC) regions. Using the NTC characteristics of H‐TRs, ternary inverters have recently been demonstrated. However, they have shown incomplete inverter characteristics; the output voltage (VOUT) does not fully swing from VDD to GND. A new H‐TR device structure that consists of a dinaphtho2,3‐b:2′,3′‐fthieno3,2‐bthiophene (DNTT) layer stacked on a PTCDI‐C13 layer is presented. Due to the continuous DNTT layer from source to drain, the proposed device exhibits novel switching behavior: p‐type off/p‐type subthreshold region /NTC/ p‐type on. As a result, it has a very high on/off current ratio (≈105) and exhibits NTC behavior. It is also demonstrated that an array of 36 of these H‐TRs have 100% yield, a uniform on/off current ratio, and uniform NTC characteristics. Furthermore, the proposed ternary inverter exhibits full VDD‐to‐GND swing of VOUT with three distinct logic states. The proposed transistors and inverters exhibit hysteresis‐free operation due to the use of a hydrophobic gate dielectric and encapsulating layers. Based on this, the transient operation of a ternary inverter circuit is demonstrated for the first time. A new heterojunction transistor structure used to demonstrate a high‐performance ternary inverter circuit is described. As the proposed heterojunction transistors provide a high on/off current ratio, a low contact resistance, hysteresis‐free operation, and negative transconductance behavior, the ternary inverter using them exhibits full VDD‐to‐GND swing, three distinct logic states, and transient operation.
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in: SICRIS
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