On Thursday, August 28, 2025, the College of Electronics Engineering / Department of Electronic Engineering at the University of Ninevah held a master’s thesis defense for student Ayman Qais Abdulqader Al-Yuzbaki, titled:
“Material and Structural Effects of Buried Layers on MOSFET Dynamics”
This research focused on studying and addressing key challenges faced by nanoscale MOSFETs, including increased leakage current, reduced breakdown voltage, and drain-induced barrier lowering (DIBL) — all of which negatively affect device performance at the nanoscale. To address these issues, the study proposed the introduction of a buried layer directly into the MOSFET substrate. This layer acts as an additional electrical barrier, aiming to improve the device’s electrical characteristics and minimize the aforementioned adverse effects.
The research investigated two different materials for use as buried layers:
• A low-k dielectric material (SiO₂)
• A high-k dielectric material (HfO₂)
Each was analyzed separately to assess its impact on MOSFET performance.
The main goal of the thesis was to evaluate the electrical performance of MOSFETs when different materials are used for the buried layer. The study involved a comprehensive examination of how the type of material, layer thickness, and position within the structure influence the transistor’s characteristics. Additionally, the research aimed to develop a mathematical correlation model linking these three factors to the device’s electrical response — providing a scientific foundation for selecting the optimal structure to achieve enhanced MOSFET performance in nanotechnology applications.
The examination committee consisted of:
1. Prof. Dr. Khalid Khalil Mohammed / University of Ninevah / College of Electronics Engineering – Chair
2. Asst. Prof. Dr. Ahmed Mohammed Ahmed / University of Ninevah / College of Electronics Engineering – Member
3. Asst. Prof. Dr. Omar Badr Mohammed / University of Ninevah / College of Electronics Engineering – Member
4. Prof. Dr. Qais Thanoon Najm / University of Ninevah / College of Electronics Engineering – Member and Supervisor
We extend our sincere congratulations to the researcher, and best wishes to the examination committee for continued success and excellence.
