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Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence

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Stable ultra-thin CdTe crystal: a robust direct gap semiconductor.

F Iyikanat¹, B Akbali¹, J Kang²

¹Department of Physics, Izmir Institute of Technology, 35430, Izmir, Turkey.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|October 25, 2017

Summary

This summary is machine-generated.

We explored ultra-thin cadmium telluride (CdTe) crystals, finding they maintain their direct band gap semiconducting properties under strain. This makes single-layer CdTe a promising material for nanoscale electronic devices sensitive to mechanical stress.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Bulk cadmium telluride (CdTe) is a well-known semiconductor.
Investigating ultra-thin or single-layer materials is crucial for advancing nanoscale electronics.

Purpose of the Study:

To investigate the structural, vibrational, and electronic properties of ultra-thin CdTe.
To explore the impact of strain on these properties and assess its suitability for devices.

Main Methods:

Density Functional Theory (DFT) based calculations were employed.
Analysis included structural optimization, vibrational spectrum calculation for dynamic stability, and electronic band structure analysis.

Main Results:

An 8-atom primitive unit cell with surface reconstructions was identified for ultra-thin CdTe.
Anisotropic in-plane electron and hole masses/mobilities were observed.
Strain-dependent anisotropic band gap variations, including a rapid increase under compression, were found.
The direct band gap nature remained stable under all applied strains.

Conclusions:

Single-layer CdTe exhibits robust electromechanical properties.
Its stable, moderate direct band gap makes it a promising candidate for nanoscale strain-dependent electronic applications.