Achieving Zero-Temperature Coefficient Point Behavior by Defect Passivation for Temperature-Immune Organic...

Area of Science:

• Organic electronics
• Materials science
• Semiconductor physics

Background:

• Organic field-effect transistors (OFETs) show promise in biomedical, sensor, and aerospace fields.
• Achieving temperature-immune OFETs is challenging due to the temperature sensitivity of organic semiconductor (OSC) properties.
• Existing theories struggle to achieve zero-temperature coefficient (ZTC) behavior in organic devices with thermal activation.

Purpose of the Study:

• To develop temperature-immune OFETs by overcoming the limitations of existing ZTC point theory.
• To enable stable and reliable performance of OFETs in variable temperature environments.
• To provide a practical solution for the widespread application of OFETs.

Main Methods:

• Eliminated Fermi pinning in OSCs through a defect passivation strategy.
• Engineered the Fermi level to approach the tail state at low temperatures, creating a negative correlation between threshold voltage (V_T) and temperature.
• Achieved ZTC point behavior via compensation between V_T and mobility across different temperatures.

Main Results:

• Successfully demonstrated ZTC point behavior in OFETs, leading to temperature-immune output current.
• Maintained a stable output current for over 50,000 seconds in variable-temperature bias voltage tests by operating at the ZTC point.
• Significantly improved the temperature immunity of OFETs.

Conclusions:

• The defect passivation strategy effectively eliminates Fermi pinning, enabling temperature-immune OFETs.
• Achieving ZTC point behavior through V_T and mobility compensation is a viable approach for temperature-immune organic electronics.
• This work offers a significant advancement for the practical application of OFETs in demanding environments.