Semiconductor Nanomaterials and Optoelectronic (Photodetector) Applications
In this seminar, laser synthesis method for producing semiconductor Silicon (Si), Molybdenum Disulfide (MoS2) nanocrystals will be discussed. The reduction in sizes and the change in optical properties of the synthesized semiconductor nanocrystals through a post-processing method will also be presented. The results will be supported using transmission electron microscopy (TEM) images and photoluminescence data. UV and UV/VIS range photodetectors that are fabricated based on the laser synthesized semiconductor nanocrystals will be demonstrated and plasmonic enhancement in photocurrent values in the presence of metal nanostructures will be shown. Scanning electron microscopy (SEM) images of the photodetectors, electrical and optical measurements regarding the fabricated photodetectors will be demonstrated. Finally, a UV/VIS range photodetector based on atomic layer deposition (ALD) grown ZnO will be demonstrated to highlight the importance of various thin film growth techniques in device fabrication processes.
Dr. Sabri Alkış received his bachelors (honors) degree in Chemistry from Bilkent University in 2004. After completing his bachelors degree at Bilkent, he did join the University of Florida Chemistry Department as a graduate student to obtain his doctor of philosophy (PhD) degree in Chemistry. He completed his PhD degree in Chemistry under the supervision of Dr. Jeff Krause who is currently a program officer in optical sciences division at the Department of Energy in USA. Since September 2010, he has been working with Dr. Ali Kemal Okyay from Bilkent University Electrical Engineering Department at Bilkent University, Institute of Material Science and Nanotechnology (UNAM) as a post-doctoral researcher. He is interested in nanoparticle synthesis through electrochemistry and laser ablation, electron microscopy (SEM, TEM) analysis and spectroscopical analysis of nanoparticles. He is also interested in nanofabrication, clean room technologies (chemical vapor deposition, electron-beam evaporation, photolitography), thin film photodetector and thin film solar cell fabrication, electrical measurements of thin film devices and simulations of nano-molecular electronic devices using Molecular Dynamics (MD) and Density Functional Theory (DFT) codes. Dr. Alkış represented his research results in various scientific meetings such as American Physical Society (APS) meeting in Denver and APS meeting in New Orleans, USA.