Meyer–Neldel DC conduction in chalcogenide glasses

Pramana

S PraKash1¹  S K Tripathi¹  Navdeep Goyal¹  Kulbir Kaur¹ 

[1] Centre of Advanced Study in Physics, Department of Physics, Panjab University, Chandigarh 160 014, India$$

关键词: Chalcogenide glasses;    DC conductivity;    Meyer–Neldel rule.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Meyer–Neldel (MN) formula for DC conductivity (𝜎DC) of chalcogenide glasses is obtained using extended pair model and random free energy barriers. The integral equations for DC hopping conductivity and external conductance are solved by iterative procedure. It is found that MN energy (𝛥 𝐸MN) originates from temperature-induced configurational and electronic disorders. Single polaron-correlated barrier hopping model is used to calculate 𝜎DC and the experimental data of Se, As2S3, As2Se3 and As2Te3 are explained. The variation of attempt frequency 𝜐0 and 𝛥 𝐸MN with parameter (𝑟/𝑎), where 𝑟 is the intersite separation and 𝑎 is the radius of localized states, is also studied. It is found that 𝜐0 and 𝛥 𝐸MN decrease with increase of (𝑟/𝑎), and 𝛥 𝐸MN may not be present for low density of defects.

【 授权许可】

Unknown