Scanning tunneling microscopic and spectroscopic studies on a crystalline silica monolayer epitaxially formed on hexagonal SiC(000(1)over-bar) surfaces

作者：Tochihara Hiroshi^*; Shirasawa Tetsuroh; Suzuki Takayuki; Miyamachi Toshio; Kajiwara Takashi; Yagyu Kazuma; Yoshizawa Shunsuke; Takahashi Toshio; Tanaka Satoru; Komori Fumio

来源：Applied Physics Letters, 2014, 104(5): 051601.

DOI：10.1063/1.4863753

An epitaxial silicon-oxide monolayer of chemical composition of Si2O3 (the Si2O3 layer) formed on hexagonal SiC(000 (1) over bar) surfaces has been observed by scanning tunneling microscopy (STM). Filled-and empty-state STM images with atomic resolution support the previously reported model. Typical structural defects in the Si2O3 layer are found to be missing SiOn (n = 1, 2, 3) molecules. The band gap of the Si2O3 layer obtained by point tunneling spectroscopy is 5.5 +/- 0.5 eV, exhibiting considerable narrowing from that of bulk SiO2, 8.9 eV. It is proposed that the Si2O3 layer is suitable as a relevant interface material for formation of SiC-based metal-oxide-semiconductor devices.

• 出版日期2014-2-3