journal article·2025-09Open access

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

Shimul Kanti Nath, Nitu Syed, Wenwu Pan, Yang Yu, Dawei Liu, Michael P. Nielsen, Jodie Yuwono, Priyank V. Kumar, Yan Zhu, David L. Cortie, Chung K. Nguyen, Lan Fu, Ann Roberts, Lorenzo Faraone, Nicholas J. Ekins‐Daukes, Wen Lei

Advanced Optical Materials· Volume 13· Issue 25

Abstract

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‐dependent optoelectronic testing shows that the device maintains a stable response up to 140 °C and generates distinctive photocurrent at temperatures up to 80 °C, demonstrating its thermal stability. Through band structure analysis, DFT calculations, and photocurrent mapping, the formation of a p‐n junction is confirmed, which enhances carrier separation via the built‐in potential, significantly boosting photoresponse. These results highlight the potential of liquid metal‐derived 2D materials in heterostructure integration, paving the way for advanced optoelectronic applications.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Gas Sensing Nanomaterials and Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Photovoltaic and Renewable Energy Engineering University of New South Wales (UNSW Sydney) Kensington NSW 2052 Australia

Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems Department of Electrical Electronic and Computer Engineering The University of Western Australia 35 Stirling Highway Perth WA 6009 Australia

School of Engineering RMIT University Melbourne VIC 3001 Australia

Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems School of Physics University of Melbourne Victoria 3010 Australia

Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems Department of Electronic Materials Engineering Research School of Physics The Australian National University Canberra ACT 2601 Australia

Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Albert‐Einstein‐Straße 15 07745 Jena Germany

School of Chemical Engineering The University of Adelaide Adelaide SA 5005 Australia

School of Chemical Engineering University of New South Wales (UNSW Sydney) Kensington NSW 2052 Australia

Australian Centre for Neutron Scattering Australian Nuclear Science and Technology Organisation Lucas Heights NSW 2234 Australia

School of Chemical and Biomolecular Engineering University of Sydney Darlington New South Wales 2008 Australia

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