Bulk Single Crystals
Almost all electronic and optoelectronic devices need semiconducting single crystal materials with specific material properties. These materials are produced through a variety of processing techniques, usually referred to as "crystal growth." Today, most bulk semiconductors are grown from the liquid phase by processes known as melt/solution techniques. These techniques have evolved from artisanship, relying very much on experience and intuition. The production of the same crystal twice is therefore still a challenge and not even possible by most techniques. Current research efforts have been focused on making these crystal growth techniques scientific so that the desired high quality crystals can be grown reproducibly.
The main objective of Dr. Sadik Dost's current research is to develop the use of Liquid Phase Electroepitaxy (LPEE) and Travelling Heater Method (THM) to produce high quality alloy semiconducting bulk single crystals. The relatively low temperatures used in LPEE and THM, and their ability to provide relatively well-controlled growth of crystals with the desired properties make these techniques technologically very promising.
This objective can only be achieved through combined experimental and theoretical study, and through a sound understanding of the growth mechanisms of these crystal growth processes. Dr. Dost's research program incorporates these qualities, and includes three main components: modelling and numerical simulations, growth experiments, and characterization of grown crystals.
Dr. Dost's collaborations with other researchers and scientists at the Centre for Advanced Materials and Related Technology (CAMTEC) - for which he is the Founding Director - promise to lead to significant developments in the fundamental knowledge of crystal growth and related advanced materials. Such materials will give considerable impetus to the relevant Canadian industry, and will, for instance, lead to small but reliable medical imaging devices that greatly improve the quality of life of Canadians.