Drift-free ferroelectric photodetection with fast temporal response via thermal diffusion engineering

Area of Science:

• Optoelectronics
• Materials Science
• Solid-State Physics

Background:

• Self-powered ferroelectric photodetectors utilize bulk photovoltaic effects for bias-free operation.
• Key limitations include slow temporal response and photocurrent drift due to inefficient thermal dissipation and heat buildup.

Purpose of the Study:

• To develop a thermal diffusion engineering approach to enhance the performance of ferroelectric photodetectors.
• To suppress heat accumulation and improve temporal response and photocurrent stability.

Main Methods:

• Reconfigured the thermal environment of ferroelectric devices to favor vertical heat extraction over lateral dissipation.
• Utilized infrared thermography and COMSOL simulations to analyze thermal behavior.
• Compared the performance of engineered devices with conventional architectures.

Main Results:

• The engineered drift-free device demonstrated a photoresponse speed improvement exceeding three orders of magnitude.
• Complete suppression of photocurrent drift was achieved.
• Distinct thermal environments were confirmed, showing heat accumulation in conventional devices and efficient extraction in engineered ones.

Conclusions:

• Thermal diffusion engineering is crucial for optimizing ferroelectric optoelectronic performance.
• The developed approach enables high-fidelity imaging with reduced crosstalk.
• Paves the way for scalable, bias-free energy-harvesting photodetectors and neuromorphic imaging systems.