The Applied Physics Department awarded a master's degree to the graduate student "Nadheer Zaid Abdul Yaqoub."

The Applied Physics Department awarded a master's degree to the graduate student "Nadheer Zaid Abdul Yaqoub" for his thesis titled
“Preparation and Characteristics study of n-BaTiO3 /p-Si  and n-BaTiO3/n-CdS/p-Si photodetectors by laser ablation “
The discussion was held in the late Professor Ibrahim Al-Jawadi Hall in the building of lecture halls and laboratories in the department. The discussion committee consisted of:

• Professor Dr. Udai Mohsen Naif
• Department of Applied Sciences / Applied Physics Branch - Chair
• Assistant Professor Dr. Mohammed Salman Mohammed
• Department of Applied Sciences / Laser Science and Technology Branch - Member
• Assistant Professor Dr. Ammar Ayesh Habeeb
• University of Diyala / College of Science / Department of Physics - Member
• Professor Dr. Raed Abdul Wahab Ismail
• Department of Applied Sciences / Laser Science and Technology Branch - Member and Supervisor
• Assistant Professor Dr. Suad Salem Shaker
• Department of Applied Sciences / Applied Physics Branch - Member and Supervisor

In this work, nanostructured BaTiO3 films on silicon and glass have been produced by the pulsed laser deposition (PLD) method at different deposition conditions (different laser fluence (8.2to 10.1 J/cm2 ),different substrate temperatures(25 to150⁰C), and a tandem nanostructured n-BaTiO3/n-CdS/p-Si at a varied number of laser pulses(100-300puls). A homemade-pulsed laser utilizes a deposition (PLD) system comprising a Q-switched Nd: YAG laser operating at a wavelength of 532 nm (second harmonic) with a pulse duration of 7ns.Revealed the formation of crystalline nanostructured BaTiO3 with mixed tetragonal and hexagonal phases, with the 150°C deposit having the highest crystallinity and largest particle size. The BaTiO3thin films were created at different laser fluences (8.2 to 10.1 J/cm2) with a constant substrate temperature of 100°C. There was a noticeable increase in the grain size of the film with an increasing laser fluence. The grown films are polycrystalline and exhibit a combination of tetragonal and hexagonal phases, with the film's crystallinity improving as the laser fluence increases. The optical transmittance of the film decreases as the substrate temperature increases and decreases with an increase as the laser fluence increases. Photoluminescence (PL) studies show emission peaks at 477, 574, 561, and 380 nm for BaTiO3 films deposited at 8.2, 8.9, 9.5, and 10.1 J/cm2, respectively. The Hall coefficient of the films was negative, indicating that the films are n-type. The best performance was observed at a laser fluence of 8.9 J/cm2, with a sensitivity of 9.2 A/W at 500 nm and a detectivity of 4.62×1012Jones. A tandem nanostructured n-BaTiO3/p-CdS/p-Si was successfully fabricated, achieving an external quantum efficiency of 153% and a detectivity of 7.4×1012 Jones at 100 pulses.