Nonstoichiometry and point defects in nonlinear optical crystals A2B4C25

✍ Scribed by Valeriy G. Voevodin; Sergey N. Grinyaev; Olga V. Voevodina

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 181 KB
• Volume: 6
• Category: Article
• ISSN: 1369-8001
• DOI: 10.1016/j.mssp.2003.07.006

✦ Synopsis

Using thermodynamic calculation, the equilibrium concentrations of point defects in ZnGeP 2 and CdGeAs 2 depending on a liquidus temperature are obtained. The conclusion about a high degree of compensation of native donors and acceptors is made. The methods of a model pseudo-potential and large unit cell are used for investigation of deep levels created by vacancies and antisites in the forbidden band of ZnGeP 2 . Optical transitions with participation of the defects are defined. It is supposed the possibility of conditions favourable for mid-IR optical absorption, as a result of the interaction of ionized zinc vacancies with GeP clusters.