Naslov
Study of microscopic mechanisms of electrical compensation of donors in CdS by fast diffusors (Cu, Ag, or Au)

Autori
Desnica-Franković, Dunja Ida ; Desnica, Uroš ; Stötzler, Arno ; Deicher, Manfred

Izvornik
Physica B. (0921-4526) 274 (1999); 887-890

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
II-VI; electrical compensation; fast diffusors; PAC

Sažetak
The goal of this study was to identify microscopic causes of the extensive changes in electrical properties observed in CdS crystal when doped with some fast-diffusers (FD), Cu, Ag or Au. The compensation of donors and the dynamics of in-diffusion was quantitatively determined by C-V measurements, whereas the changes at the atomic level were followed by Perturbed Angular Correlation (PAC) method. The penetration of FDs, as deduced from C-V, correlated well with changes observed in PAC, which manifest as new PAC-frequencies and/or the increase of (VCd-InCd) pairs. Arguments are given that the new PAC frequencies observed in CdS:Ag belong to (InCd+-VCd2--Agi+)o and analogous complexes in Cu. No indication of such complexes was observed in Au doped CdS. In CdS:Au practically all donors are passivated directly by pairing with VCd trapped at the nearest Cd site, whereas in Ag or Cu-doped CdS most of donors are electrically compensated from the distance, by FDCd acceptors. Presented results suggest a complex microscopic mechanism by which the FD in-diffusion into CdS creates highly compensated semi-insulating, SI, material.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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