Wearable and Implantable Bioelectronics Enabled by 2D Materials-Based Layer Transfer

2D materials-based layer transfer (2DLT) is an emerging lift-off technique for producing large-area freestanding single-crystalline epitaxial films, which offer high electronic/optoelectronic performance and ultrathin form factor that are essential for wearable and implantable bioelectronic device applications. Single-crystalline III-V/III-N compound semiconductor membranes can be epitaxially grown on substrates coated with 2D materials such as graphene or boron nitride, which results in weak van der Waals interface that facilitates mechanical exfoliation of the device layer from wafer [1]. In this talk, I will discuss our recent efforts that utilize 2DLT to build: (i) chipless wireless electronic skins based on gallium nitride surface acoustic wave sensors capable of low-power and high-sensitivity detection of a broad range of external stimuli [2], and (ii) 3D-integrated micro-LED heterostructures that achieve extremely high device densities and suggest potential applications in optoelectronic-based neural interfaces [3]. <br/>[1] Y. Kim <i>et al.</i>, <i>Nature</i> 544, 340 (2017). [2] Y. Kim <i>et al.</i>, <i>Science </i>377, 859 (2022). [3] J. Shin <i>et al.</i>, <i>Nature, </i>614, 81 (2023).