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Modelling of III-Nitride Epitaxial Layers Grown on Silicon Substrates with Low Dislocation-Densities

Published online by Cambridge University Press:  28 January 2019

Khaled H. Khafagy ,
Tarek M. Hatem  and
Salah M. Bedair
Khaled H. Khafagy
Affiliation:
Centre for Simulation Innovation and Advanced Manufacturing, The British University in Egypt, El-Sherouk City, Cairo11837, Egypt Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC27695, USA.
Tarek M. Hatem*
Affiliation:
Centre for Simulation Innovation and Advanced Manufacturing, The British University in Egypt, El-Sherouk City, Cairo11837, Egypt Faculty of Energy and Environmental Engineering, The British University in Egypt, El-Sherouk City, Cairo11837, Egypt.
Salah M. Bedair
Affiliation:
Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC27695, USA.
*
*(Email: tmhatem@ncsu.edu)
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Abstract

Large lattice and thermal expansion coefficients mismatches between III-Nitride (III N) epitaxial layers and their substrates inevitably generate defects on the interfaces. Such defects as dislocations affect the reliability, life time, and performance of photovoltaic (PV) devices. High dislocation densities in epitaxial layer generate higher v-shaped pits densities on the layer top surface that also directly affect the device performance. Therefore, using an approach such as the embedded void approach (EVA) for defects reduction in the epitaxial layers is essential. EVA relies on the generation of high densities of embedded microvoids (∼108/cm2), with ellipsoidal shapes. These tremendous number of microvoids are etched near the interface between the III N thin-film and its substrate where the dislocation densities present with higher values.

This article used a 3-D constitutive model that accounts the crystal plasticity formulas and specialized finite element (FE) formulas to model the EVA in multi-junction PV and therefore to study the effect of the embedded void approach on the defects reduction. Mesh convergence and 2-D analytical solution validation is conducted with accounting thermal stresses. Several aspect and volume ratios of the embedded microvoids are used to optimize the microvoid dimensions.

Keywords

defectsIII-VinterfacemodelingSi
Type
Articles
Information
MRS Advances , Volume 4 , Issue 13: Energy-Transfer, Storage and Conversion , 2019 , pp. 755 - 760
Copyright
Copyright © Materials Research Society 2019 

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References

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