Growth of the Bi2Se3 Surface Oxide for Metal–Semiconductor–Metal Device Applications

详细信息    查看全文

• 作者：Yun-Chieh Yeh ; Po-Hsun Ho ; Cheng-Yen Wen ; Guo-Jiun Shu ; Raman Sankar ; Fang-Cheng Chou ; Chun-Wei Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：February 18, 2016
• 年：2016
• 卷：120
• 期：6
• 页码：3314-3318
• 全文大小：389K
• ISSN：1932-7455

文摘

The effect of the surface structure of Bi₂Se₃ on its interior properties has been well studied recently, but the interfacial structure and electrical properties of the oxidized Bi₂Se₃ surface are little known. In contrast to the self-limited formation of native oxide on Bi₂Se₃, the degree of oxidation on the Bi₂Se₃ surface in oxygen plasma is enhanced. Results of transmission electron microscopy and X-ray photoelectron spectroscopy show that the surface of the oxidized Bi₂Se₃ is composed of a layer of amorphous bismuth oxide (BiO_x), and the thickness of the BiO_x layer can be controlled by the length of the plasma process. Electrical measurements of this structure present the Schottky-type transport property at the interface between the oxidized layer and the bulk Bi₂Se₃ crystal, and the turn-on voltage depends on the thickness of the surface BiO_x layer. This study of the structure, formation mechanism, and electrical properties of the surface oxide of Bi₂Se₃ formed in oxygen plasma provides useful information for future development of electronic devices based on bismuth chalcogenides.