Chenxiang Zhang and colleagues have achieved 1-micron features in indium-gallium-zinc oxide (IGZO) thin films using a dry patterning method. The team employed silicon nitride membrane stencils and ion-beam etching to create these features, an improvement over the 5-micron resolution possible with direct sputter deposition using the same technique, the company says.
Electrical measurements of the patterned IGZO revealed a Hall mobility of 21 square centimeters per volt-second, demonstrating functional performance without using liquid chemicals or high heat. The researchers report this establishes a practical route for fabricating IGZO, supporting future work on biodegradable and transient electronics.
Silicon Nitride Stencils Enable 1-Micron IGZO Feature Definition
This dry patterning method avoids liquid chemicals and high heat, addressing a critical need for fabricating electronics on delicate, biodegradable substrates. Controlling carrier density proved possible by adjusting oxygen flow during deposition, maintaining mobility ranges for sputtered IGZO films. The team’s work demonstrates a pathway to transfer this process to fragile materials, opening possibilities for transient and biodegradable electronic devices, according to Silicon Nitride. The findings are detailed in the publication “All-dry stencil patterning of IGZO thin films with micrometer-scale resolution and electrical validation” in Micro and Nano Engineering.
This approach offers a practical alternative to conventional lithography for IGZO, a semiconductor already sputtered near room temperature, and establishes a foundation for future work in areas like bioelectronics and environmentally sustainable technology. The research supports the development of circuits that disappear when they are no longer needed, reducing electronic waste and environmental impact.
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