Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 460, Issue -, Pages 146-152Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2017.01.036
Keywords
Amorphous semiconductors; Carrier-type reversal; Polarons
Funding
- UGC-DAE CSR, Kalpakkam, India [CSR-KN/CRS-48/2013-14/661]
Ask authors/readers for more resources
We report the detailed thermal, structural, microstructural and electrical transport studies on Pb.Ge42 xSesa with (0 x :5 20) glasses. The influence of Pb content on thermal and local atomic structure and its qualitative consequences on the electronic properties has been elucidated. The composition dependent variation of glass transition temperature (T-g), change in specific heat capacity at the glass transition (Delta C-p) and non-reversing enthalpy change (Delta H-NR) complement with each other for enabling the role of Pb content on structural relaxation behavior of these glasses. The Raman spectroscopic studies reveal the presence of different structural species and its variation with Pb content, i.e. pronounced decrease in the amount of ethane-like structural units with the incorporation of Pb content. The addition of Pb content into Ge42Se58 glass, the network connectivity becomes loosened due to the depolymerization. The observed Raman band position of ethane-like structural units show noticeable blue shift with an increase of Pb content, which dictates the development of stress in the network structure caused by the predominant ionic character. The microstructural studies by positron annihilation lifetime spectroscopy reveal the nature of defect states and its variation with Pb content. The composition dependent dc conductivity and its activation energy shows marked change across the p-n transition threshold due to the change in the charged defect concentration. The influence of local atomic structure and nature of defect states responsible for the carrier type reversal (CTR) has been discussed. (C) 2017 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available