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A micro-patterned transient UV photodetector enabled by solvent-free microfabrication.

Zhiqing Xu¹, Qinhua Guo¹, Lizhou Yang¹

¹The Hong Kong University of Science and Technology (Guangzhou), No.1 Du Xue Rd, Nansha District, 511544, Guangzhou, China.

Microsystems & Nanoengineering

|August 20, 2025

Summary

Researchers developed a novel, eco-friendly UV photodetector using transient electronics. This temporary sensor dissolves harmlessly, offering potential for biodegradable and flexible sensing applications.

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Area of Science:

Materials Science and Engineering
Nanotechnology
Environmental Science

Background:

Transient electronics offer environmentally friendly breakdown for applications like implantable devices and sensors.
Miniaturization is crucial for advanced electronics, but degradable materials challenge conventional microfabrication due to heat and solvent sensitivity.

Purpose of the Study:

To present a micro-scale UV photodetector (PD) fabricated using a novel, solvent-free material patterning method.
To demonstrate a scalable and efficient microfabrication strategy for transient, biodegradable, and flexible sensor technologies.

Main Methods:

Fabrication of a UV PD using molybdenum (Mo) electrodes, zinc oxide (ZnO) photoactive material, and polyvinyl alcohol (PVA) substrate.
Development and application of a novel solvent-free material patterning technique.
Testing of the PD's responsivity and response to varying sunlight intensities.

Main Results:

The transient UV PD, dissolvable in deionized water into non-toxic byproducts, achieved high responsivity (>50 A/W).
The device showed a clear response to different sunlight intensities, indicating suitability for temporary UV sensing.
The photoresist used in the patterning method was successfully reused, improving fabrication efficiency and reducing waste.

Conclusions:

The developed solvent-free patterning method enables micro-scale fabrication of transient electronics on unconventional platforms.
This approach facilitates the integration of functional materials for next-generation biodegradable, flexible, and temporary sensor technologies.
The reusable photoresist enhances process sustainability and economic viability for advanced transient electronic devices.