Raman spectroscopy study of , , and crystals

✍ Scribed by Yunlong Cui; Utpal N. Roy; Pijush Bhattacharya; Adrian Parker; Arnold Burger; Jonathan T. Goldstein

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 449 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.06.022

✦ Synopsis

AgGaSe 2 , AgGa 0.9 In 0.1 Se 2 , and AgGa 0.8 In 0.2 Se 2 single crystals grown by the horizontal Bridgman technique were studied utilizing Raman spectroscopy excited with 633-and 784-nm lasers at temperatures varied from 77 to 300 K. The resonant Raman scattering associated with a transition from the Γ 6 (B) of the valence band to the conduction band Γ 6 of AgGa 0.9 In 0.1 Se 2 crystal is demonstrated. Resonant enhancements of the longitudinal optical (LO) polar modes of Γ 5 (or E) including Γ 5L (W 4 ), Γ 5L (W 3 ), Γ 5L (X 5 ), and Γ 5L (Γ 15 ), and their overtones and combinations in the crystal at 77 K were observed.