On the capability of revealing the pseudosymmetry of the chalcopyrite-type crystal structure

✍ Scribed by D. Abou-Ras; J. Gibmeier; G. Nolze; A. Gholinia; P. Konijnenberg

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 410 KB
• Volume: 43
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200711082

✦ Synopsis

The tetragonal crystal-structure type of chalcopyrites (chemical formula

) is a superstructure of sphalerite type. The c/a ratio differs generally from the ideal value 2, i.e., the crystal structure is pseudocubically distorted. For CuInSe 2 and CuGaSe 2 thin films, simulations demonstrate that it is theoretically possible to reveal the tetragonality in electron backscatter-diffraction (EBSD) patterns for CuGaSe 2 , whereas it may not be possible for CuInSe 2 . EBSD experiments on CuGaSe 2 thin films using the "Advanced Fit" band-detection method show that it is possible to extract accurate misorientation-angle distributions from the CuGaSe 2 thin film. Pole figures revealing the texture of the CuGaSe 2 thin film are shown, which agree well with X-ray texture measurements from the same layer.