Dr. Ahmet TUNA (PhD)

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A researcher and R&D engineer in nano/micro fabrication with 5+ years of hands-on experience delivering reproducible thin-film device processes and advanced characterization. Background spanning MEMS sensors and optoelectronic devices, with strong cleanroom discipline, process documentation habits, and data-to-decision workflows. Known for systematic problem solving (root-cause analysis), cross-functional collaboration with technicians/engineers/professors, and a service mindset in the DfM aim, while also developing the research outcomes.

·       Designed, simulated, fabricated, and characterized hetero-junction NIR/Vis photodetectors.

·       By optimizing production metrics, having more efficient photo-detectors; as increasing 68.805% in detectivity, 66.286% in photo-current gain, 64.135% in photosensitivity, 277.931% in responsivity.

·       Conducted extensive device characterization; AFM (from 6.66 nm to 15.69 nm average roughness), I–V measurement setups (-5 V to 5 V with 0.1 V steps), XRD (in C(111)/H(002) peak dominants), PL, and SEM.

·       Applied Pulsed Laser Deposition (PLD) (at 10 mJ) and thin-film optimization (in 60 to 90 nm scale) on CdTe, CZTS, CdS, CIGS, Ag, Al, Au, CuO materials; refined process control through systematic measurements.

·       Performed statistical analysis and signal analysis on opto-electronic results with end-device performance.

·       Employed nanosecond and femtosecond laser systems (90 fs, 80 MHz, 200 mW) for wafer processing and HF etching, integrating results into device roadmaps.

·       Coaching new researchers to make them get used into processes.

·       Focusing on parasitic effects of detectors onto photonic sub-devices located with them, to control overall qualification in an IC design. Optimizing SNR and detectivity parameters.

·       Conducting research projects that influenced industry standards, thus leading to a fourfold increase in follow-up lab funding for my managers. Presenting the results at 6 international conferences and authored 2 journal papers.

·       Gaining all the above experiences in an international environment where English is the common language; with colleagues from Morocco, Algeria, Egypt, Turkey and Greece.

Focus: Designing, simulating and fabricating porous photodetectors have Ag/p-CdTe/ (porous) Si/ Ag thin film structure to solve the lack of efficiency problem of sensors in a restricted area.

Focus: Designing, simulating and fabricating 3D printed capacitive pressure sensors (have Cr/Au structure) with corrugated surface to increase the sensitivity in the same restricted sensor area.

Microscopy & Characterization: AFM, SEM, XRD, PL, Raman, UV/Vis spectrometry, I–V measurement setups, electronic measurement methodologies, opto-electronic measurements, RLC meters.

Microfabrication & Processing: Pulsed Laser Deposition (PLD), sputtering, PVD/CVD/ALD, HF etching, annealing, femtosecond laser processing, optical table alignment, Objet 3D printing (additive manufacturing), coil design.

Modeling & Simulation: Silvaco TCAD, SCAPS 1D, COMSOL Multiphysics, SolidWorks, PSpice, AutoCAD.

Programming & Data Analysis: Python, MATLAB, C++, C, statistical methods, signal analysis, system dynamics modeling (micro and macro systems), data visualization/graphical representation, OriginLab.

Languages: English (Fluent), German (Elementary), Dutch (Beginner), Turkish (Native).

Interests: Drummer and musician; daily reader in science, philosophy and world history.

Journal Articles:

-        Tuna, A., Gezgin, S.Y., B. Mercimek, Kılıç, H.Ş.
Photodetector Properties of CdTe Thin Films and CdTe/Si Heterojunctions Produced by Pulse Laser Ablation
Optical and Quantum Electronics 58, 126 (2026), DOI: https://doi.org/10.1007/s11082-026-08708-4

Conference Papers:

Full-text conference papers available on ResearchGate: [link]

-        Tuna, A., Erden, O. K., Gokdel, Y. D., & Sarioglu, B. (2017, June). 3D printed capacitive pressure sensor with corrugated surface. In 2017 13th Conference on Ph. D. Research in Microelectronics and Electronics (PRIME) (pp. 149-152). IEEE.; DOI: 10.1109/PRIME.2017.7974129

-        A. Tuna, S. Y. Gezgin, Y. Gündoğdu and H. Ş. Kılıç; An Investigation of Some Photo-Sensing Parameters in the Photo-Detector Design of n-ZnO/p-Si Heterojunction Diode Produced by Pulsed Laser Deposition Technique, 3. International Baku Scientific Research Congress, October 15-16, 2021, Baku, AZERBAIJAN, Baku Eurasia University, ISBN: 978-1-955094-17-7, (Oral Presentation) (Full Text).

-        A. Tuna, S. Y. Gezgin, Y. Gündoğdu and H. Ş. Kılıç; An Approach to a Photo-Diode through Non-Linear System Dynamics in the J – V Characteristics of n-Zno/p-Si Heterojunction Produced by Pulsed Laser Deposition Technique, International Euroasia Congress on Scientific Researches and Recent Trends 9, 18-20 February 2022/Antalya – Turkey, ISBN: 978-625-8405-60-6, (Oral Presentation) (Full Text).

-        Tuna A., Gezgin S. Y., Gündoğdu Y. and Kılıç H. Ş.; A Simulation Study on GaAs Homojunction through Designing Photodetectors and/or Solar Cells, 3rd International Conference on Applied Engineering and Natural Sciences, July 20-23, 2022, Konya, Turkey, ISBN: 978-625-00-0830-0, (Oral Presentation) (Only Abstract).

-        Tuna A., Gezgin S. Y., Gündoğdu Y. and Kılıç H. Ş.; Simulation and Design of a Hg/Cd/Te Homojunction Infrared Photodetector,  8th International Black Sea Coastline Countries Scientific Research Conference, 2022, August 29-30, Sofia, Bulgaria, ISBN: 978-625-8213-50-8, (Oral Presentation) (Full Text). 

-        A. Tuna, S. Y. Gezgin, Y. Gündoğdu and H. Ş. Kılıç; Graphical Representation of a Germanium Homojunction from a p-n Junction Simulation Software, Latin America 4th International Conference on Scientific Researches, 2022, Nov. 3 – 6, Mexico City, ISBN: 978-605-72051-7-9, (Oral Presentation) (Full Text). 

-        A. Tuna, S. Y. Gezgin, Y. Gündoğdu Kabakcı, H. Ş. Kılıç; Fabrication, Characterization and Simulation of CdTe Thin Film Deposition by Employing PLD Technique; ICSAR 5th International Conference on Scientific and Academic Research; 2024, Dec. 23-24, Konya, Turkey, ISBN: 978-625-5954-26-8