Functionalized Organic Material Platform for Realization of Ternary Logic Circuit

Area of Science:

• Organic electronics
• Semiconductor device physics
• Multivalued logic systems

Background:

• Conventional binary logic faces limitations.
• Multivalued logic (MVL) offers a path beyond binary constraints.
• Organic negative differential resistance (NDR) devices are key for stable MVL operation, requiring high peak-to-valley current ratios (PVCR) and double-peak transfer characteristics.

Purpose of the Study:

• To fabricate an organic NDR (ONDR) device with double-peak transfer characteristics and a high PVCR (>10^2).
• To develop a key element device for MVL applications using an organic material platform.
• To demonstrate ternary latch circuit operation using the developed ONDR device.

Main Methods:

• Fabrication of an organic NDT (ONDT) device using a series connection of electron-dominant (P(NDI2OD-Se2)) and hole-dominant (P(DPP2DT-T2)) channel ambipolar organic field-effect transistors (AOFETs).
• Achieving NDR functionality via correlated biasing of the ONDT device.
• Modulating carrier transfer by varying the PMMA:P(VDF-TrFE) ratio in the mixed top-gate dielectric layer to control PVCR.

Main Results:

• An ONDR device with double-peak transfer characteristics and a high PVCR (>10^2) was successfully fabricated.
• The PVCR of the ONDT device reached up to 13,000 through carrier transfer modulation.
• Demonstrated ternary latch circuit operation with three distinct and controllable output states by adjusting the dielectric layer composition.

Conclusions:

• The developed organic NDR device is a promising key element for MVL applications.
• The ability to tune PVCR and logic states via dielectric composition offers significant control.
• This work advances the development of advanced electronic devices beyond binary logic.