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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
Published on: December 29, 2016
First principles study on the electronic properties of Zn(64)Sb(64-x)Te(x) solid solution (x = 0, 2, 3, 4)
Jian-Hua Zhao1, Er-Jing Han, Tian-Mo Liu
1College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China; E-Mails: erjing_4630@yahoo.com.cn (E.-J.H.); tmliu@cqu.edu.cn (T.-M.L.); zeng_wen1982@yaoo.com.cn (W.Z.).
Tellurium (Te) doping alters the electronic properties of zinc antimonide (ZnSb) systems. Specific Te concentrations induce n-type conductivity, making them suitable as donor dopants.
Area of Science:
- Materials Science
- Solid-State Physics
- Computational Chemistry
Background:
- Zinc antimonide (ZnSb) is a promising thermoelectric material.
- Understanding its electronic properties is crucial for optimizing performance.
- Doping is a common strategy to tune semiconductor characteristics.
Purpose of the Study:
- To investigate the impact of tellurium (Te) doping on the electronic properties of ZnSb.
- To determine the optimal Te doping concentration for achieving desired conductivity.
- To elucidate the mechanism behind conductivity changes induced by Te doping.
Main Methods:
- First-principles calculations were employed to model Zn(64)Sb(64-x)Te(x) systems.
- Electronic band structures were analyzed for various Te concentrations (x = 0, 2, 3, 4).
- The influence of Te s and p orbits on the conduction band was examined.
Main Results:
- Te doping was confirmed to alter the conductivity type of ZnSb.
- For x = 2 and 3, Te doping introduced new bands and a donor energy level.
- This resulted in the induction of n-type conductivity in the ZnSb system.
- Te doping concentrations of 1.56at% and 2.34at% were identified as suitable for donor applications.
Conclusions:
- Tellurium doping effectively transforms ZnSb into an n-type semiconductor.
- The observed changes are attributed to the introduction of Te-derived energy levels near the conduction band.
- Optimized Te doping levels present a viable route for developing ZnSb-based donor materials.
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