Liquid Metal-Exfoliated SnO2-Based Mixed-Dimensional Heterostructures for Visible-to-Near-Infrared Photodetection

Abstract

Ultra-thin 2D materials have gain significant attention for making next-generation optoelectronic devices. Here, a large-area heterojunction photodetector is fabricated using a liquid metal-printed 2D SnO2 layer transferred onto CdTe thin films. The resulting device demonstrates efficient broadband light sensing from visible to near-infrared wavelengths, with enhanced detectivity and faster photo response. Significantly, the device shows a ≈105-fold increase in current than the dark current level when illuminated with a 780 nm laser and achieves a specific detectivity of ≈1012 Jones, nearly two orders of magnitude higher than that of a standalone CdTe device. Additionally, temperature-depend..