Academic Journal
Visible-Light-Driven Semiconductor–Metal Transition in Electron Gas at the (100) Surface of KTaO 3
| العنوان: | Visible-Light-Driven Semiconductor–Metal Transition in Electron Gas at the (100) Surface of KTaO 3 |
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| المؤلفون: | Xiaochen Tian, Bocheng Li, Hu Sun, Yucheng Jiang, Run Zhao, Meng Zhao, Ju Gao, Jie Xing, Jie Qiu, Guozhen Liu |
| المصدر: | Nanomaterials, Vol 13, Iss 23, p 3055 (2023) |
| بيانات النشر: | MDPI AG |
| سنة النشر: | 2023 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | KTaO 3, surface 2DEG, photoelectric response, semiconductor–metal transition, Chemistry, QD1-999 |
| الوصف: | Two-dimensional electron gas (2DEG) at the (100) KTaO 3 (KTO) surface and interfaces has attracted extensive interest because of its abundant physical properties. Here, light illumination-induced semiconductor–metal transition in the 2DEG at the KTO surface was investigated. 2DEG was formed at the surface of KTO by argon ion bombardment. The 2DEG prepared with a shorter bombardment time (300 s) exhibits semiconducting behavior in the range of 20~300 K in the dark. However, it shows a different resistance behavior, namely, a metallic state above ~55 K and a semiconducting state below ~55 K when exposed to visible light (405 nm) with a giant conductivity increase of about eight orders of magnitude at 20 K. The suppression of the semiconducting behavior is found to be more pronounced with increasing light power. After removing the illumination, the resistance cannot recover quickly, exhibiting persistent photoconductivity. More interestingly, the photoresponse of the 2DEG below 50 K was almost independent of the laser wavelength, although the photon energy is lower than the band gap of KTO. The present results provide experimental support for tuning oxide 2DEG by photoexcitation, suggesting promising applications of KTO-based 2DEG in future electronic and optoelectronic devices. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 2079-4991 |
| Relation: | https://www.mdpi.com/2079-4991/13/23/3055; https://doaj.org/toc/2079-4991; https://doaj.org/article/b5a796043f364a33a56045f4a3dda6bf |
| DOI: | 10.3390/nano13233055 |
| الاتاحة: | https://doi.org/10.3390/nano13233055 https://doaj.org/article/b5a796043f364a33a56045f4a3dda6bf |
| رقم الانضمام: | edsbas.17875C52 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 20794991 |
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| DOI: | 10.3390/nano13233055 |