Controllable Threshold Voltage in Organic Complementary Logic Circuits with an Electron-Trapping Polymer and...

Area of Science:

• Organic electronics
• Materials science
• Device physics

Background:

• Flexible electronics require stable and controllable organic transistor circuits.
• Existing organic circuits often face challenges in achieving reliable performance and wide-ranging voltage control.

Purpose of the Study:

• To present controllable and reliable complementary organic transistor circuits on a PET substrate.
• To demonstrate reversible control of transistor threshold voltage and circuit inverting voltage using external stimuli.
• To achieve high noise immunity and stability in organic circuits.

Main Methods:

• Fabrication of complementary organic transistors using a photoactive dielectric (DPA-CM doped PMMA) and an electron-trapping layer (Cytop) on a PET substrate.
• Utilized copper (Cu) as source/drain electrodes for both p-channel and n-channel transistors.
• Employed a program voltage (<10 V) and UV light irradiation for reversible control of electrical characteristics.

Main Results:

• Achieved reversible control of threshold voltage and inverting voltage over a wide range.
• Demonstrated tuning of inverting voltage to half the supply voltage at -2 V program voltage.
• Obtained excellent noise margins (64% NMH, 68% NML) for maximum noise immunity.
• Showcased high stability with a retention time exceeding 10^5 seconds for inverter switching voltage.

Conclusions:

• Developed a flexible and simple method for robust, high-performance organic circuits.
• Demonstrated the potential of controllable complementary transistor inverters for advanced electronic applications.
• The use of photoactive dielectric and electron-trapping layers offers a promising route for tunable organic electronics.