Wafer-scale Synthesis of Mithrene and its Application in 2D Heterostructure UV Photodetectors
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Mohammadi, Maryam Stoll, Stefanie L. Herrero, Analía F. Khan, Sana Fabrizi, Federico Gollwitzer, Christian Wang, Zhenxing Anantharaman, Surendra B. Lemme, Max C. |
| author_facet | Mohammadi, Maryam Stoll, Stefanie L. Herrero, Analía F. Khan, Sana Fabrizi, Federico Gollwitzer, Christian Wang, Zhenxing Anantharaman, Surendra B. Lemme, Max C. |
| contents | Silver phenylselenide (AgSePh), known as mithrene, is a two-dimensional (2D) organic-inorganic chalcogenide (MOC) semiconductor with a wide direct band gap, narrow blue emission and in-plane anisotropy. However, its application in next-generation optoelectronics is limited by crystal size and orientation, as well as challenges in large-area growth. Here, we introduce a controlled tarnishing step on the silver surface prior to the solid-vapor-phase chemical transformation into AgSePh thin films. Mithrene thin films were prepared through thermally assisted conversion (TAC) at 100°C, incorporating a pre-tarnishing water (H${_2}$O) vapor pulse and propylamine (PrNH${_2}$) as a coordinating ligand to modulate Ag${^+}$ ion reactivity and facilitate the conversion of Ph${_2}$Se${_2}$ into an active intermediate. The AgSePh thin films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and grazing incidence wide-angle X-ray scattering (GIWAXS). The pre-tarnishing process, combined with organic ligands, resulted in large crystals exceeding 1 $μ$m and improved homogeneous in-plane orientation, while also enabling the selective, wafer-scale synthesis of mithrene on 100 mm wafers. Furthermore, the films were integrated on planar graphene field-effect phototransistors (GFETs) and demonstrated photoresponsivity beyond 100 A/W at 450 nm, highlighting mithrene's potential for blue light-detection applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_22535 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Wafer-scale Synthesis of Mithrene and its Application in 2D Heterostructure UV Photodetectors Mohammadi, Maryam Stoll, Stefanie L. Herrero, Analía F. Khan, Sana Fabrizi, Federico Gollwitzer, Christian Wang, Zhenxing Anantharaman, Surendra B. Lemme, Max C. Materials Science Applied Physics Silver phenylselenide (AgSePh), known as mithrene, is a two-dimensional (2D) organic-inorganic chalcogenide (MOC) semiconductor with a wide direct band gap, narrow blue emission and in-plane anisotropy. However, its application in next-generation optoelectronics is limited by crystal size and orientation, as well as challenges in large-area growth. Here, we introduce a controlled tarnishing step on the silver surface prior to the solid-vapor-phase chemical transformation into AgSePh thin films. Mithrene thin films were prepared through thermally assisted conversion (TAC) at 100°C, incorporating a pre-tarnishing water (H${_2}$O) vapor pulse and propylamine (PrNH${_2}$) as a coordinating ligand to modulate Ag${^+}$ ion reactivity and facilitate the conversion of Ph${_2}$Se${_2}$ into an active intermediate. The AgSePh thin films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and grazing incidence wide-angle X-ray scattering (GIWAXS). The pre-tarnishing process, combined with organic ligands, resulted in large crystals exceeding 1 $μ$m and improved homogeneous in-plane orientation, while also enabling the selective, wafer-scale synthesis of mithrene on 100 mm wafers. Furthermore, the films were integrated on planar graphene field-effect phototransistors (GFETs) and demonstrated photoresponsivity beyond 100 A/W at 450 nm, highlighting mithrene's potential for blue light-detection applications. |
| title | Wafer-scale Synthesis of Mithrene and its Application in 2D Heterostructure UV Photodetectors |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2506.22535 |