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Deep centers in gold‐doped HgCdTe

 

作者: C. A. Merilainen,   C. E. Jones,  

 

期刊: Journal of Vacuum Science&Technology A: Vacuum, Surfaces, and Films  (AIP Available online 1983)
卷期: Volume 1, issue 3  

页码: 1637-1640

 

ISSN:0734-2101

 

年代: 1983

 

DOI:10.1116/1.572246

 

出版商: American Vacuum Society

 

关键词: deep energy levels;gold additions;diffusion;donors;holes;activation energy;cross sections;electron capture;poole−frenkel effect;crystal doping;doped materials;dlts;mercury tellurides;cadmium tellurides

 

数据来源: AIP

 

摘要:

Gold is a fast‐diffusing acceptor in HgCdTe. It has been used as ap‐type dopant and as a metal contact. This paper reports the presence of deep levels in gold‐dopedx=0.48 Hg1−xCdxTe. Two types of spectra were observed; each had energy levels betweenEv+1/4EgapandEv+1/2Egap. The capture cross sections for these centers have been determined and for most of the levels they involve small hole capture cross sections, 10−17to 10−21cm2, and moderate electron capture cross sections, 10−15to 10−16cm2. The hole capture cross sections for these centers had large negative activation energies indicative of hole capture at a positive center with a Coulomb repulsive barrier. The corresponding electron capture is then at Coulombically attractive positive centers. The situation described requires that the DLTS activation energies be corrected for the temperature dependence of the hole capture cross sections and for the Poole–Frenkel effect for electron capture. The energy levels and capture cross sections reported make these centers effective minority carrier recombination sites inp‐type material. The minority carrier lifetimes measured are very close to those calculated for Shockley–Read recombination at the DLTS characterized centers.

 

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