| Abstract Scope |
Heterogeneous integration of high-performance semiconductors with unconventional substrates enables new opportunities in wearable and optoelectronic systems. However, single-crystalline gallium nitride (GaN) is typically confined to rigid wafers such as sapphire, limiting its use in deformable platforms. Here, we demonstrate the fabrication and transfer of ~200 nm-thick freestanding single-crystalline GaN membranes onto arbitrary substrates, enabling stretchable devices while preserving material and device performance. Based on these membranes, we develop wireless, low-power sensing platforms capable of multimodal detection, including strain, ultraviolet light, and sodium ions. Device functionality is validated through both in vitro and in vivo measurements without compromising sensitivity. This approach provides a pathway for integrating wide-bandgap semiconductors into mechanically compliant systems for wearable and structural health monitoring applications. |