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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.13378 |
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| _version_ | 1866915117684228096 |
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| author | Nath, Shimul Kanti Syed, Nitu Pan, Wenwu Yu, Yang Liu, Dawei Nielsen, Michael P. Yuwono, Jodie Kumar, Priyank Zhu, Yan Cortie, David L. Nguyen, Chung K. Fu, Lan Roberts, Ann Faraone, Lorenzo Ekins-Daukes, Nicholas J. Lei, Wen |
| author_facet | Nath, Shimul Kanti Syed, Nitu Pan, Wenwu Yu, Yang Liu, Dawei Nielsen, Michael P. Yuwono, Jodie Kumar, Priyank Zhu, Yan Cortie, David L. Nguyen, Chung K. Fu, Lan Roberts, Ann Faraone, Lorenzo Ekins-Daukes, Nicholas J. Lei, Wen |
| contents | Ultra-thin two-dimensional (2D) materials have gained significant attention for making next-generation optoelectronic devices. Here, we report a large-area heterojunction photodetector fabricated using a liquid metal-printed 2D $\text{SnO}_2$ 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 than bare CdTe photodetectors. Significantly, the device shows a nearly $10^5$-fold increase in current than the dark current level when illuminated with a 780 nm laser and achieves a specific detectivity of around $10^{12} \, \text{Jones}$, nearly two orders of magnitude higher than a device with pure CdTe thin film. Additionally, temperature-dependent optoelectronic testing shows that the device maintains a stable response up to $140^\circ \text{C}$ and generates distinctive photocurrent at temperatures up to $80^\circ \text{C}$, demonstrating its thermal stability. Using band structure analysis, density functional theory (DFT) calculations, and photocurrent mapping, the formation of a $p$-$n$ junction is indicated, contributing to the enhanced photo response attributed to the efficient carrier separation by the built-in potential in the hetero-junction and the superior electron mobility of 2D $\text{SnO}_2$. Our results highlight the effectiveness of integrating liquid metal-exfoliated 2D materials for enhanced photodetector performance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_13378 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Liquid Metal-Exfoliated SnO$_2$-Based Mixed-dimensional Heterostructures for Visible-to-Near-Infrared Photodetection Nath, Shimul Kanti Syed, Nitu Pan, Wenwu Yu, Yang Liu, Dawei Nielsen, Michael P. Yuwono, Jodie Kumar, Priyank Zhu, Yan Cortie, David L. Nguyen, Chung K. Fu, Lan Roberts, Ann Faraone, Lorenzo Ekins-Daukes, Nicholas J. Lei, Wen Materials Science Optics Ultra-thin two-dimensional (2D) materials have gained significant attention for making next-generation optoelectronic devices. Here, we report a large-area heterojunction photodetector fabricated using a liquid metal-printed 2D $\text{SnO}_2$ 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 than bare CdTe photodetectors. Significantly, the device shows a nearly $10^5$-fold increase in current than the dark current level when illuminated with a 780 nm laser and achieves a specific detectivity of around $10^{12} \, \text{Jones}$, nearly two orders of magnitude higher than a device with pure CdTe thin film. Additionally, temperature-dependent optoelectronic testing shows that the device maintains a stable response up to $140^\circ \text{C}$ and generates distinctive photocurrent at temperatures up to $80^\circ \text{C}$, demonstrating its thermal stability. Using band structure analysis, density functional theory (DFT) calculations, and photocurrent mapping, the formation of a $p$-$n$ junction is indicated, contributing to the enhanced photo response attributed to the efficient carrier separation by the built-in potential in the hetero-junction and the superior electron mobility of 2D $\text{SnO}_2$. Our results highlight the effectiveness of integrating liquid metal-exfoliated 2D materials for enhanced photodetector performance. |
| title | Liquid Metal-Exfoliated SnO$_2$-Based Mixed-dimensional Heterostructures for Visible-to-Near-Infrared Photodetection |
| topic | Materials Science Optics |
| url | https://arxiv.org/abs/2501.13378 |