Engineering Route for Stretchable, 3D Microarchitectures of Wide Bandgap Semiconductors for Biomedical Applications

Thanh An Truong, Tuan Khoa Nguyen, Xinghao Huang, Aditya Ashok, Sharda Yadav, Yoonseok Park, Mai Thanh Thai, Nhat Khuong Nguyen, Hedieh Fallahi, Shuhua Peng, Sima Dimitrijev, Yi Chin Toh, Yusuke Yamauchi, Chun Hui Wang, Nigel Hamilton Lovell, John A. Rogers, Thanh Nho Do, Nam Trung Nguyen, Hangbo Zhao*, Hoang Phuong Phan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Wide bandgap (WBG) semiconductors have attracted significant research interest for the development of a broad range of flexible electronic applications, including wearable sensors, soft logical circuits, and long-term implanted neuromodulators. Conventionally, these materials are grown on standard silicon substrates, and then transferred onto soft polymers using mechanical stamping processes. This technique can retain the excellent electrical properties of wide bandgap materials after transfer and enables flexibility; however, most devices are constrained by 2D configurations that exhibit limited mechanical stretchability and morphologies compared with 3D biological systems. Herein, a stamping-free micromachining process is presented to realize, for the first time, 3D flexible and stretchable wide bandgap electronics. The approach applies photolithography on both sides of free-standing nanomembranes, which enables the formation of flexible architectures directly on standard silicon wafers to tailor the optical transparency and mechanical properties of the material. Subsequent detachment of the flexible devices from the support substrate and controlled mechanical buckling transforms the 2D precursors of wide band gap semiconductors into complex 3D mesoscale structures. The ability to fabricate wide band gap materials with 3D architectures that offer device-level stretchability combined with their multi-modal sensing capability will greatly facilitate the establishment of advanced 3D bio-electronics interfaces.

Original languageEnglish (US)
Article number2211781
JournalAdvanced Functional Materials
Volume33
Issue number34
DOIs
StatePublished - Aug 22 2023

Keywords

  • 3D microstructures
  • origami/kirigami-inspired microstructures
  • stretchable microarchitectures
  • wide bandgap materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Condensed Matter Physics
  • Electrochemistry

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