Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-02-01

Journal: SOLID STATE SCIENCES

Included Journals: EI、SCIE、Scopus

Volume: 13

Issue: 2

Page Number: 384-387

ISSN: 1293-2558

Key Words: Cd-dopped ZnO; n-type carrier; Density functional theory

Abstract: An ab initio calculation based on density functional theory is applied to study the formation energy and transition energy level of defects and complexes in Cd-dopped ZnO. The calculation shows that the incorporation of Cd into ZnO leads to the increase of the O vacancies (V(O)). V(O) exists in the form of Cd(Zn)-V(O) complex, which can balance the strain caused by Cd(Zn) and V(O). Due to high formation energy of the Zn interstitials (Zn(i)) and deep transition energy level of V(O), Zn(i) and V(O) cannot serve singly as the source of the n-type carriers in Cd-dopped ZnO. It is also found that the Zn(i)-Cd(Zn)-V(O) complex is a shallow donor like Zn(i), but has lower formation energy. Thus, the source of n-type carriers is believed to be a complex with Zn(i)-Cd(Zn)-V(O) structures in Cd-doped ZnO. (c) 2010 Elsevier Masson SAS. All rights reserved.