PhD position: Theory of carrier transport in nitride-based heterostructures

Tyndall National Institute at University College Cork invites applications for a PhD position. The research is theory-driven, spanning basic science through to investigations of fundamental processes limiting present day devices, and including design and modeling of new and optimized devices.

The project aims to study carrier transport in nitride-based nanostructures for optoelectronic device applications, such as light emitting diodes (LEDs). Here, nitride-based heterostructures, such as multiple InGaN quantum wells, are of critical importance for energy efficient solid state lighting.

Recent experimental and theoretical studies reveal that electronic and optical properties of nitride-based heterostrucures are significantly affected by carrier localization effects arising from alloy fluctuations. However, for carrier transport, important for understanding and optimising LED properties, these factors have been widely neglected. For a realistic treatment of these systems, carrier localization effects should be included in the theoretical description, ideally on a microscopic, atomistic level. Combining first-principles, empirical atomistic and continuum-based calculations, the project targets a detailed understanding of how carrier localization effects and thus related deviations from the usually assumed ideal structures impact especially carrier transport in InGaN-based multi quantum well systems and ultimately LED structures.

The project aims for a close linkage between theory and experiment, to elucidate how to manage carrier localization and ultimately carrier transport in these structures.

Responsibilities:

This project builds on first-principles, empirical atomistic and continuum-based investigations we have undertaken of nitride-based nanostructures, including strain and alloy effects. Here, development of atomistic and continuum-based simulation tools, including parameter and code development, is required to address carrier transport in III-N heterostructures and devices. Interaction with both internal and external partners from theory and experiment will be a central part of the project.

Requirements

The successful candidate for the positions will have a very good undergraduate degree in physics, electrical engineering, applied mathematics, chemistry or materials science.

Informal enquiries concerning this studentship can be made to: Dr. Stefan Schulz (email [email protected]).

Please apply via http://www.tyndall.ie/career/search, selecting reference number SS-3 and following the instructions to complete the associated application form, attaching your CV and motivation letter.