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Electrical - Electronics Engineer

Willowbrook, Illinois, United States
July 17, 2019

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Rahmi (Robby) O. Pak, Ph.D, Engineer

Chicago, IL, USA



Dr. Rahmi Orhon Pak is an Engineer and Scientist with 8+ years of experience in different projects. He is

a subject matter expert in optical-nuclear sensor technologies, materials, software and hardware components.

His work has direct applications in the energy arena (such as nuclear power, solar cells, gas), in the automation/aerospace fields for computer vision, in optical communications, in biomedical imaging, and is featured within the emerging field of new 'quantum/brain' computers.

He holds a very high level of interest in semiconductor devices, batteries, solar cells, sensors and other electrical components, microcontrollers, FPGA/ASIC, model-based development of mixed-signal electronic circuits and software for imaging, diagnostics, instrumentation and control systems for commercial applications.


Business Developer, Science & Technology September 2018 – Present.

Voluntary, Chicago, IL

●Actively building relationships in semiconductor, communications, energy, automotive, aerospace, biomedical, and many other major industries.

●Technical presentations to Fortune-500 listed companies at various locations in US.

Electrical Engineer (Postdoc. Res. Scientist), Materials Science Division September 2017 – September 2018

Argonne National Laboratory, UChicago-Argonne LLC Lemont, IL

●Argonne National Laboratory (ANL) is a science and engineering research national laboratory operated by University of Chicago Argonne LLC for the U.S. Department of Energy.

●Performed basic scientific research on new engineering materials for next-gen. (quantum & memory) computers, medical imaging and environmental monitoring (optical UV-Visible-IR, x-ray/gamma-ray, neutron etc.) sensors.

●Model-based development of Software-, Hardware-in-the-Loop (SIL, HIL) design.

●Developed solutions and standards to problems in medical imaging, power, RF semiconductor components.

●Worked on machine learning adaptive algorithms for filtering, error correction and spectrograms.

Electrical Engineer (Quality and Safety Officer), Dept. of Electrical Engineering June 2014 – December 2016

University of South Carolina Columbia, SC

●University of South Carolina is a public research university in Columbia, SC, with high research activity in aerospace, marine, nuclear, medicine, semiconductors, robotics and Internet-of-Things (IoT) technologies.

●Responsible for the general safety of the workers in an electronics fabrication laboratory (at least $2 million).

●Managed an inventory of over 300 units of chemicals and trained-certified lab personnel for safety.

●Arrangement of quarterly inspections from Environmental Health and Safety officials.

●Ensured that the cleanroom fabrication, testing and characterization in the lab are up to standards.

●Decision-making and writing of emergency safety procedures, and Standard Operation Procedures.

●Corrective Action Preventive Action (CAPA) and failure mode analysis.

●Six Sigma methodologies, Lean Manufacturing and Continuous Improvement.

Electrical Engineer (Postgrad. Res. Scientist), Dept. of Electrical Engineering August 2012 – August 2017

University of South Carolina Columbia, SC

●Performed basic scientific research on new engineering materials for next-gen. solar cells and renewable energy, nuclear astrophysics, medical imaging, and environmental monitoring.

●Simulated and modeled electrical components for design software, hardware and production analysis.

●Optimized the work flow and process of new imaging components, reducing defects by automation.

●Failure analysis of physical defects by optical and electron microscopy, SEM, EDS, EBIC, DLTS.

●Analyzed sensor data using embedded software ML algorithms, for precise actuator feedback control loops.

●Used power electronics for actuators such as AC/DC servo-motors, relays and for temp. or frequency control.

●Embedded software programs with C/C++, Python, LabView, Matlab/Simulink.


Doctor of Philosophy (PhD) in Electrical Engineering GPA: 3.71/4.00 December 2016

University of South Carolina Columbia, SC

Bachelor of Science (B.Sc.) in Electrical Engineering (magna cum laude) GPA: 3.78/4.00 May 2013

University of South Carolina Columbia, SC

Electrical – Optical – Nuclear Engineering

●Highly experienced with industry practices, regulations, and manufacturing failure analysis (design validation and verification, root cause analysis, six sigma, continuous improvement, FMEA etc) Corrective Action Preventive Action (CAPA).

●Highly experienced in designing nuclear and optical spectroscopy and imaging systems from materials development to engineered solutions.

●Nuclear radiation detectors, pulse height measurements (x-ray, gamma, neutron and alpha irradiation) and energy spectroscopy, time-of-flight mobility-lifetime measurements, equivalent noise charge measurements (ENC), multiparametric quantum correction, on CdZnTe, SiC, a-Se, Perovskite detectors. Gaseous detectors. Scintillators, avalanche photodiodes and time-resolved detection. Charge-coupled device (CCD) camera system design. Optical transceivers.

●Single-photon detectors, polarimetry, optical systems, laser, x-ray and gamma-ray spectroscopy for elemental identification and particle detection.

●Microwave (MHz) and millimeter-wave (GHz) crystal growth and design of 2D and 3D layered materials.

●Power semiconductors and component systems: silicon carbide (SiC), gallium nitride (GaN) and others.

●Other sensors for temperature, pressure, acceleration, vibration, electromagnetics applications.

●Experienced with schematic and ASIC design, Orcad, Eagle, Altium, PSpice, Mentor Graphics, etc. Has done Circuit evaluation and Simulation (SPICE netlist, FEM).

●Experience with design of AC and DC motor control circuits, power circuits, batteries, memory, logic, and/or analog/digital circuit design.

●Design electrical and electromechanical test fixtures, Agile design and bring up new circuits for mass production and production support.

●Experience with electronics, hardware and software validation and verification (HIL, SIL etc.).

●Bring-up and debug of ASIC PCB circuits, FPGA, integrated systems, and test fixture assemblies.

●Validation test verification of electrical circuit with experience in hardware development, from design concept, through schematic design entry, circuit simulation, PCB / ASIC layout, board bring-up, troubleshooting. Familiar with IP, FPGA, PCB / ASIC development.

●Design of analog/digital filters (such as the Kalman filter), dynamic filtering, adaptive, multivariate / multiparametric analysis, control systems, error correction systems and algorithms.

●Experience with noise analysis and measurement, pulse shaping, noise optimal systems and calibration.

●Ability to design electrical circuit diagrams, electrical drawings, control wiring diagrams & equipment wiring diagrams, bill of materials (BOM).

●Experience with development tools such as cameras, imaging systems & software, oscilloscopes, lock-in amplifiers, audio analyzers, and network analyzers.

●Familiar with automatic control systems integration and SCADA, LabView Data Acquisition, PLC Programming, and hardware-in-the loop (HIL) design.

●Validation test verification of mechanical design with experience in machine development, from design concept, through schematic design entry, FEM simulation (electromagnetics, semiconductor, mechanics, fluids, heat), CAM layout, components assembly, troubleshooting.

●Proficient and familiar with COMSOL Multiphysics, ANSYS, SolidWorks, AutoCAD & other computer tools.

●Proficient with Excel (macros), Word, Powerpoint, Office & other Microsoft tools.

●Interested in working with Python, Matlab / Simulink, LabView, JMP, Minitab, Origin, Verilog, VHDL, C, C++, TensorFlow, Keras, R, Java, Siemens, Allen-Bradley, FANUC, Javascript, Visual Basic, C#, .NET (dot Net).

●Mathematical regularization - machine learning, peak deconvolution, and noise-reduction of signals, statistical analysis.

●Certifications & Training: Cleanroom Operations, General Laboratory Safety, Hazardous Chemicals Safety, Nuclear Radiation Safety, Laser Safety.

Materials Science, Semiconductors and Manufacturing Engineering

●Highly experienced in statistical quality control and quality assurance (QC/QA) for materials design for electronics components (such as capacitors, diodes, transistors, transducers, motors, magnetics etc.).

●Machining, brazing, forming, soldering and welding of aluminum, tin, copper and stainless steel alloys for components within geometric tolerances.

●Bulk crystal growth of CdZnTe, CdSeTe, InSe, GaSe, GaTe, Cu2ZnSn(S2Se2), CeBr and more… (Bridgman, Vertical Gradient Freeze (VGF), solution-growth, etc.), doping, oxy-hydrogen quartz glass welding, wafer cutting, grinding, chemo-mechanical polishing (CMP), high temperature annealing, furnace heat transfer modeling, plasma enhanced chemical vapor deposition (PECVD) using H2S gas, and epitaxial carbon (graphite).

●Thin-film deposition for various metal-semiconductor contacts and for photovoltaic layer/solar cell fabrication (thermal evaporation, e-beam evaporation, DC plasma sputtering, spray pyrolysis, atomic layer deposition).

●FTIR spectroscopy, ellipsometry, polarimetry and optical/electron microscopy.

●Nanocrystal synthesis by facile hot injection method (Cu2ZnSnS4).

●Oxidation, passivation and wet chemical etching (aqueous acids and bases, and molten-salt) of semiconductors and glasses, reactive ion etching.

●Electrical and structural defect characterization, deep level transient spectroscopy (DLTS), thermally stimulated current (TSC) measurements, current-voltage measurements (I-V), capacitance-voltage measurements (C-V), scanning electron microscopy (SEM / EDS), powder x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV-Vis-IR spectroscopy, fluorescence, thermoluminescence, solar simulation, optical microscopy, Hall effect mobility, stylus profilometry, photolithography, ion implantation.

●Experience in using a liquid nitrogen cooled cryostat (>77K cryogenic) for measurements, experience with diffusion and turbo-mechanical vacuum pumps, experience with temperature control systems.


Outstanding Research Assistant Award (out of 90 grad. students department-wide) April 2015

Dept. of Electrical Engineering, University of South Carolina Columbia, SC

SPARC Graduate Research Fellowship (out of 200 select grad. students university-wide) May 2014

Office of Vice President of Research, University of South Carolina Columbia, SC

Outstanding Senior Award (out of all graduating undergrad. students university-wide) April 2013

Office of Student Life, University of South Carolina Columbia, SC

Magellan Undergraduate Research Fellowship

(out of 1000 select undergrad. students university-wide) May 2012

Office of Vice President of Research, University of South Carolina Columbia, SC

12 technical research papers published – IEEE Transactions in Nuclear Science, SPIE Proceedings, ECS-Journal of Solid State Science and Technology. 1 technical research paper under review in Nature.

Membership of IEEE, SPIE, American Physical Society, Tau Beta Pi, Eta Kappa Nu (HKN).


1.Daniel G. Chica, Yihui He, Kyle M. McCall, Duck Young Chung, Rahmi O. Pak, Giancarlo Trimarchi, Zhifu Liu, Patrick M. DeLurgio, Bruce W. Wessels, and Mercouri G. Kanatzidis, manuscript on a new type of neutron detector, under review, submitted to Nature on April 28, 2019.

2.Duck Young Chung, Yihui He, Wenwen Lin, Rahmi O. Pak, and Mercouri G. Kanatzidis, “Enhanced detection performance of perovskite semiconductor CsPbBr3 by material optimization,” SPIE Proc., 10762-40, 2018.

3.Rahmi O. Pak and Krishna C. Mandal, "Defect Levels in Nuclear Detector Grade Cd0.9Zn0.1Te Crystals," ECS Journal of Solid State Science and Technology, 5, P3037-P3040, 2016.

4.Rahmi O. Pak, Khai V. Nguyen, Cihan Oner, Mohammad A. Mannan, and Krishna C. Mandal, “Defect characterization of Cd0.9Zn0.1Te crystals using electron beam induced current (EBIC) imaging and thermally stimulated current (TSC) measurements,” SPIE Proc., 9593, 95931J1-1-95931J1-8, 2015.

5.Rahmi O. Pak, Khai V. Nguyen, Cihan Oner, Towhid Chowdhury, and Krishna C. Mandal, “Characterization of Cd0.9Zn0.1Te Single Crystals for Radiation Detectors,” IEEE Conf. Record, R3A-39, 7 pages, 2015.

6.Cihan Oner, Towhid A. Chowdhury, Rahmi O. Pak, and Krishna C. Mandal, “Improved radiation detectors on 4H-SiC epilayers by edge termination,” SPIE Proc., 9968, 99680M-1-99680M-6, 2016.

7.Mohammad A. Mannan, Khai V. Nguyen, Rahmi O. Pak, Cihan Oner, and Krishna C. Mandal, “Deep Levels in n-Type 4H-Silicon Carbide Epitaxial Layers Investigated by Deep Level Transient Spectroscopy and Isochronal Annealing Studies,” IEEE Transactions on Nuclear Science, 63, 1083-1090, 2016.

8.Mohammad A. Mannan, Khai V. Nguyen, Rahmi Pak, Cihan Oner, and Krishna C. Mandal, “Surface passivation and isochronal annealing studies on n-type 4H-SiC epitaxial layer,” SPIE Proc. 9593, 95931H-195931H-11, 2015.

9.Khai V. Nguyen, Rahmi O. Pak, Cihan Oner, Mohammad A. Mannan, and Krishna C. Mandal, “High-barrier Schottky contact on n-type 4H-SiC epitaxial layer and studies of defect levels by deep level transient spectroscopy (DLTS),” SPIE Proc., 9593, 95930I-195930I-8, 2015.

10.Cihan Oner, Khai V. Nguyen, Rahmi O. Pak, Mohammad A. Mannan, and Krishna C. Mandal, “Investigation of thermally evaporated high resistive B-doped amorphous selenium alloy films and metal contact studies,” SPIE Proc., 9593, 95931I-195931I-11, 2015.

11.Cihan Oner, Khai V. Nguyen, Rahmi O. Pak, Towhid Chowdhury, and Krishna C. Mandal, “Investigation of Metal Contacts on High-Resistivity Large-Area Amorphous Selenium Alloy Films,” IEEE 2015 Medical Imaging Conference, Nuclear Science Symposium on Room Temperature Semiconductor X- and Gamma-ray Detectors, Oct. 31–Nov. 07, San Diego, California, IEEE Conf. Record, R3A-41, 6 pages, 2015.

12.Sandeep K. Chaudhuri, Khai Nguyen, Rahmi O. Pak, Liviu Matei, Vladimir Buliga, Michael Groza, Arnold Burger, and Krishna C. Mandal, “Large Area Cd0.9Zn0.1Te Pixelated Detector: Fabrication and Characterization,” IEEE Transactions on Nuclear Science, 61,793-798, 2014.

13.Krishna C. Mandal, Ramesh M. Krishna, Rahmi O. Pak, and Mohammad A. Mannan, “Characterization of high-resistivity CdTe and Cd0.9Zn0.1Te crystals grown by Bridgman method for radiation detector applications,” SPIE Proc., 9213, 92131L-1-9, 2014.

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