Vertical organic permeable dual-base transistors for logic circuits

Abstract

The main advantage of organic transistors with dual gates/bases is that the threshold voltages can be set as a function of the applied second gate/base bias, which is crucial for the application in logic gates and integrated circuits. However, incorporating a dual gate/base structure into an ultra-short channel vertical architecture represents a substantial challenge. Here, we realize a device concept of vertical organic permeable dual-base transistors, where the dual base electrodes can be used to tune the threshold voltages and change the on-currents. The detailed operation mechanisms are investigated by calibrated TCAD simulations. Finally, power-efficient logic circuits, e.g. inverter, NAND/AND computation functions are demonstrated with one single device operating at supply voltages of <2.0 V. We believe that this work offers a compact and technologically simple hardware platform with excellent application potential for vertical-channel organic transistors in complex logic circuits.

Vertical organic transistors with short channels for multifunctional optoelectronic devices

“…63–65 The vertical dual-gate SCLTs reported by Guo et al exhibited excellent electrical properties with a high on-state current density of 1.54 A cm −2 and a large current gain of 9.2 × 10 5 . Simultaneously, power-efficient applications including inverter and NAND/AND logic units were demonstrated by operating single devices at a bias below 2.0 V. 66…”

Organic Permeable Base Transistors – Insights and Perspectives

“…[49] Thus, concerning charge carrier injection and mobility, such oxide semiconductors should be superior to organic materials. Also, with regard to the formation of the base electrode, n-type semiconducting oxides offer a manifold of possibilities to evaluate [25] Copyright 2020, The Authors, published by Springer Nature. different metals as well as treatment processes.…”

“…Reproduced under the terms of the CC‐BY‐4.0 license. [ 25 ] Copyright 2020, The Authors, published by Springer Nature.…”

“…have now succeeded in realizing vertical organic permeable dual‐base transistors (OPDBTs), where the dual base electrodes can be used to tune the threshold voltages and change the on‐currents. [ 25 ]…”

“…Among all the different vertical transistor designs (e.g., Schottky barrier vertical organic fieldeffect transistors, [12,13] vertical organic field-effect transistors, [14,15] electrolyte-gated vertical organic transistors, [16][17][18] organic static induction transistors [19][20][21] ), organic permeable base transistors (OPBTs) stand out due to their excellent performance figures such as a transition frequency of 40 MHz measured in a pulsebiasing mode at V CE = 8.6 V, [22] on/off ratio > 10 8 , current densities as high as 1 kA cm −2 , [23] and favorable stability. [24] Furthermore, the research on OPBTs is rapidly progressing in the last couple of years, which led to innovative devices, [25] new fabrication methods, [26] and even complementary circuits. [27] However, there are still several problems to solve, such as integration into circuitry and improving device yield and reliability.…”