CdSeхTe1- _固溶体的电导率反演

A. Belyaev, Vladimir P. Rubetz, V. V. Antipov, D. Mokhorov
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摘要

本文介绍了利用气相附加加热区合成CdSeхTe1- _ - _固溶体的电学研究结果。大家都知道,固溶体是不光彩的体系。研究发现CdSeхTe1- m - m固溶体具有高电阻率(T = 298 K ~ 109欧姆∙cm)的特点,且随碲含量的增加而增大。结果表明,该材料的活化能随温度的升高而单调降低,最高可达0.64 eV;在温度急剧变化后建立平衡的异常长的时间;低霍尔迁移率(T = 413 K时不大于100 cm2V-1s-1)。确定了固溶体是具有高度补偿的体系,由于结构的无序性,能带的电位起伏是不均匀的。CdSeхTe1- x固溶体结构的无序性是由于离子半径的不同造成的。镉离子半径小(1.03Å),而碲离子半径大(2.21Å)。这种系统的特征是弗伦克尔型的自然失序。其中碲含量的增加促进了具有受体性质的镉VCd空位的形成,在高浓度下导致电导率类型从电子到空穴的反转。给出了电导率和霍尔迁移率的温度和浓度依赖性。
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Conductivity inversion in CdSeхTe1-х solid solutions
The results of electrical studies of CdSeхTe1-х solid solutions synthesized using the zone of additional heating of the vapor phase are presented. It is established that solid solutions are dishonorable systems. It was found that CdSeхTe1-х solid solutions are characterized by: high resistivity (at T = 298 K up to 109 Ohm∙cm), which increases with tellurium content. It was found that a high value of activation energy (up to 0.64 eV), monotonously decreasing with temperature; an abnormally long time to establish equilibrium after a sharp change in temperature; low Hall mobility (at T = 413 K no more than 100 cm2V-1s-1). It is established that the solid solutions are systems with a high degree of compensation and an inhomogeneous potential relief of the bands due to disordering of the structure. The disordering of the structure in CdSeхTe1-х solid solutions is due to the difference in ionic radii. The ionic radius of cadmium is small (1.03Å), and the ionic radius of tellurium is large (2.21Å). Such systems are characterized by the Frenkel type of natural disorder. An increase in the tellurium content in them promotes the formation of cadmium VCd vacancies with acceptor properties, which at high concentrations lead to an inversion of the type of conductivity from electron to hole. Temperature and concentration dependences of conductivity and Hall mobility are given.
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