Enhanced performance of MoS$_2$/SiO$_2$ field-effect transistors by hexamethyldisilazane (HMDS) encapsulation
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914709080375296 |
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| author | Jana, Santu Prasad Shivangi Gupta, Suraina Gupta, Anjan K. |
| author_facet | Jana, Santu Prasad Shivangi Gupta, Suraina Gupta, Anjan K. |
| contents | Scalable methods for improving the performance and stability of a field-effect transistor (FET) based on two-dimensional materials are crucial for its real applications. A scalable method of encapsulating the exfoliated MoS$ _{2} $ on SiO$ _{2} $/Si substrate by hexamethyldisilazane (HMDS) is explored here for reducing the influence of interface traps and ambient contaminants. This leads to twenty-five times reduction in trap density, three times decrease in subthreshold swing, three times increase in the peak field-effect mobility and a drastic reduction in hysteresis. This performance remains nearly the same after several weeks of ambient exposure of the device. This is attributed to the superhydrophobic nature of HMDS and the SiO$_2$ surface hydrophobization by the formation of covalent bonds between the methyl groups of HMDS and silanol groups of SiO$_{2}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_05885 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Enhanced performance of MoS$_2$/SiO$_2$ field-effect transistors by hexamethyldisilazane (HMDS) encapsulation Jana, Santu Prasad Shivangi Gupta, Suraina Gupta, Anjan K. Materials Science Mesoscale and Nanoscale Physics Scalable methods for improving the performance and stability of a field-effect transistor (FET) based on two-dimensional materials are crucial for its real applications. A scalable method of encapsulating the exfoliated MoS$ _{2} $ on SiO$ _{2} $/Si substrate by hexamethyldisilazane (HMDS) is explored here for reducing the influence of interface traps and ambient contaminants. This leads to twenty-five times reduction in trap density, three times decrease in subthreshold swing, three times increase in the peak field-effect mobility and a drastic reduction in hysteresis. This performance remains nearly the same after several weeks of ambient exposure of the device. This is attributed to the superhydrophobic nature of HMDS and the SiO$_2$ surface hydrophobization by the formation of covalent bonds between the methyl groups of HMDS and silanol groups of SiO$_{2}$. |
| title | Enhanced performance of MoS$_2$/SiO$_2$ field-effect transistors by hexamethyldisilazane (HMDS) encapsulation |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.05885 |