OPTICAL AND ELECTRONIC PROPERTIES OF M2Si (M = Mg, Ca, Sr) GROWN BY REACTIVE DEPOSITION TECHNIQUE

Author:

HU JUNHUA1,KATO AKIHIKO2,SADOH TAIZOH3,MAEDA YOSHUHITO4,GALKIN K. N.5,TURCHIN T. V.5,TATSUOKA HIROKAZU6

Affiliation:

1. Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8011, Japan

2. FDK Corporation, 2281 Washizu, Kosai, 431-0495, Japan

3. Department of Electronics, Kyushu University, Fukuoka 819-0395, Japan

4. Department of Energy Science and Technology, Kyoto University, Kyoto 606-8501, Japan

5. Institute for Automation and Control Processes of Far Eastern, Branch of Russian Academy of Science, 5 Radio St., 690041 Vladivostok, Russia

6. Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan

Abstract

Single phase M 2 Si ( M = Mg , Ca , Sr ) silicides were grown using Si substrates, by thermal treatment of the substrates in the vapors of the metallic sources, M , and the electronic structures and optical property of the silicides were investigated. The electronic band structures of the silicides were calculated using the first-principles total-energy calculation program in pseudopotential schemes with plane-wave basis functions. The calculated optical reflectance spectra were also deduced from the theoretical band structures, and roughly agreed with the experimental results except for the low reflectance intensity around 2 eV. This suggests that the energy band gap of the silicides roughly agree with the calculated values of 0.15, 0.31 and 0.35 eV for Mg 2 Si , Ca 2 Si and Sr 2 Si , respectively, within the underestimation of the band gap by the density functional calculation. The optical property of the silicides is also discussed in relation to the morphological structures of the silicides.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

Reference30 articles.

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