Abdullah Al Mamun
TD Process integration engineer at Intel Corporation
TD Process integration engineer at Intel Corporation
🔲Process integration engineer in BE interconnect metal layers @ Intel.

🔲Experience in working with thin film deposition, etching (plasma and wet), photolithography, chemical mechanical polishing, etc.

🔲Extensive experience in defect solving and metrology tools ( SEM, EDS, TEM, SIMS, etc.).

🔲Experienced in DOE, SPC, JMP.
Intel Corporation
https://www.linkedin.com/company/intel-corporation
Working as a BE and FBE integration engineer
Portland, Oregon Area
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TD Process integration engineer
Old Dominion University
https://www.linkedin.com/company/old-dominion-university
Key responsibilities: 

1. Assisting students in executing experimental laboratory works for Electronic Circuit Analysis. 
2. Administering exams, grading scripts and conducting problem solving sessions for Circuit Analysis I, Linear System Analysis, Electronic Circuit
Norfolk, VA, USA.
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Teaching Assistant
Old Dominion University
https://www.linkedin.com/company/old-dominion-university
Key responsibilities:

1. Design, fabrication, optimization and characterization of highly efficient organic-inorganic perovskite solar devices in nitrogen environment using Glove Box. 
2. Design and fabrication of Photodetectors, BNNT & CNT based Supercapacitors.
2. Development of a novel electron transport layer of PCBM/carbon to reduce production cost using E-beam evaporation techniques. 
3. Developed a non-toxic NiOx thin film using thermal oxidation and magnetron sputtering.
4. Synthesized nano-particles using sol-gel process and employed in the solar device.
5. Fabricated hysteresis free perovskite device implementing E-beam evaporated C60 layer.
6. Achieved thermally stable perovskite thin film using a polymer layer of PMMA.
7. Investigated defective grain boundaries in perovskites through chemical, spatial, and temporal 2D mapping and developed a solution using hot-casting technique.
8. Process development for patterning electrode using Dry and Wet Etching.
Norfolk, VA, USA
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Research Assistant
Old Dominion University
https://www.linkedin.com/company/old-dominion-university
Key responsibilities:

1. Running all research operations and maintaining all equipments for semiconductor processing. 
2. Trained users on Semiconductor processing systems such as E-beam and thermal evaporation, Glove box, UV-vis, PL, TCSPC, Solar simulator, XRD, Etching and Spin coating.
Jefferson Lab, Newport News, VA
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Photovoltaics lab in-charge
Doctor of Philosophy - PhD
PhD Dissertation topic:
Interface engineering of highly efficient organic-inorganic hybrid perovskite solar cells.
Electrical and Computer Engineering
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Old Dominion University
https://www.linkedin.com/school/old-dominion-university/
Master of Science - MS
Master's thesis:
GaN/Al1−xGaxN QW based UV emitter
Applied Physics, Electronics and Communication Engineering
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University of Dhaka
https://www.linkedin.com/school/dhakauniversity/
Bachelor of Science - BS
Undergraduate project:
Ballistic Transport in Schottky-Barrier and MOSFET-like Carbon Nanotube Field Effect Transistors: Modeling, Simulation and Analysis
Applied Physics, Electronics and Communication Engineering
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University of Dhaka
https://www.linkedin.com/school/dhakauniversity/
Top-performing graduate student based on academic achievements
Golden Key International Honour Society
Member
Bangladesh Student Association
Member
Hybrid halide perovskite is attracting attention as an alternative solar cell material, but the air instability of perovskite is still a major research problem. The current work investigates how air degradation affects the crystal size, surface morphology, and mechanical hardness of the perovskite. Interestingly, we found that the crystal sizes of perovskite, PbI2 and I2 extracted from XRD measurements exhibited a dynamic variation with exposure to air. Particularly, it was found that the elastic modulus and hardness of the perovskite films increased for a 20 hr exposure to air and then gradually decreased due to chemical decomposition and formation of pinholes in the perovskite film.
Influence of air degradation on morphology, crystal size and mechanical hardness of perovskite film
Materials Letters, North-Holland.
https://www.sciencedirect.com/science/article/pii/S0167577X18310310
Organo-lead halide perovskites, specifically methylammonium lead iodide (CH3NH3PbI3), has grown to be promising material for a wide array of photovoltaic applications. However, perovskite still lacks in its long-term stability and is sensitive to decomposition via moisture. This work investigates the integration of multiple polymer coatings that have the potential to improve the air stability of the perovskite. The investigated polymers include poly(methyl methacrylate) (PMMA), polyvinyl alcohol (PVA), poly vinylpyrrolidone (PVP), and sodium polyacrylate (NaPA). Scanning electron microscopy (SEM) was able to confirm the morphology of the perovskite and areas of degradation. In addition, X-ray diffraction (XRD) study reveals that the perovskite coated in the PMMA remains the most efficient polymer coating among the rest of the studied polymers.
Characterization of Perovskite (CH3NH3PbI3) Degradation with the Integration of Different Polymers for Increased Stability
Materials Letters, North-Holland.
https://www.sciencedirect.com/science/article/abs/pii/S0167577X18316252
For perovskite solar cells, thermal treatment of perovskite/PCBM layer is typically required for facilitated charge extraction, thereby eliminating the notorious photocurrent hysteresis. However, a simple manufacturing process without additional heat treatment is desirable for low-cost production. Remarkably, we observed an absence of photocurrent hysteresis of perovskite solar cell with as-deposited PCBM/C60 layer. To understand what caused hysteresis-free photocurrent behaviors, PL quenching studies were conducted using time-resolved lifetime decays and deconvoluted PL analysis. It is found that the perovskite/PCBM layer, which was not thermally treated after deposition, led to inefficient defect passivation of grain boundaries (GBs) and defective domains at the perovskite interface. This led to charge trapping and detrapping events at the perovskite/PCBM interface, which caused the photocurrent hysteresis behaviors. In contrast, it is found that C60 diffused from the PCBM/C60 layer effectively passivated the perovskite GBs even without thermal treatment, which facilitated the charge transfer through GBs to electrodes and eliminated the photocurrent hysteresis. Our result provides a more economical manufacturing process without heat treatment of perovskite/PCBM layer while achieving defect passivation and high charge extraction efficiency of perovskite solar cells.
Impact of PCBM/C60 electron transfer layer on charge transports on ordered and disordered perovskite phases and hysteresis-free perovskite solar cells
Organic Electronics, North-Holland.
https://www.sciencedirect.com/science/article/pii/S1566119918300521
While organo-inorganic halide perovskite solar cells show great potential to meet future energy needs, their thermal instability raises serious questions about their commercialization viability. At present, the stability of perovskite solar cells has been studied under various environmental conditions including humidity and temperature. Nonetheless, understanding of the performance of CH3NH3PbI3−xClx perovskite solar cells is limited. This study reports the irreversible performance degradation of CH3NH3PbI3−xClx perovskite solar cells during the heating and cooling processes under AM 1.5 and unveils what triggers the irreversible performance degradation of solar cells. Particularly, the primary cause of the irreversible performance degradation of CH3NH3PbI3−xClx is quantitatively analyzed by monitoring in real time the development of deteriorated crystallinity, charge trapping/detrapping, trap depth, and the PbI2 phase, namely a critical signal of perovskite degradation while varying the temperature of the perovskite films and solar cells. Most surprisingly, it is revealed that the degradation of both perovskite films and solar cells was triggered at ∼70 °C. Remarkably, even after the device temperature cooled down to room temperature, the degraded performance of the solar cells persisted with increasing charge trapping and further development of the PbI2 phase. Identification of the irreversible performance degradation of perovskite solar cells provides guidance for future development of more stable perovskite solar cells.
Unveiling the irreversible performance degradation of organo-inorganic halide perovskite films and solar cells during heating and cooling processes
Physical Chemistry Chemical Physics, Royal Society of Chemistry.
http://pubs.rsc.org/en/content/articlelanding/2017/cp/c7cp03106h/unauth#!divAbstract
We explore a new characterization approach capable of probing the grain interior (GI) and grain boundary (GB) of a CH3NH3PbI3−xClx perovskite thin film. In particular, we have found that the photoluminescence (PL) spectrum observed for a CH3NH3PbI3−xClx perovskite thin film is asymmetric, and can be deconvoluted using a bi-Gaussian function, representing the ordered and disordered phases of the perovskite film. In order to understand the origin of the ordered and disordered phases of the perovskite film, two-dimensional (2D) PL mapping was performed to resolve the PL spectra at the nanoscale level. Quantitative analysis of the local PL spectra revealed that the ordered phase originated from the GIs while the disordered phase mainly came from the GBs. In particular, power-dependent PL measurements of the deconvoluted PL spectra revealed that smaller grained perovskites showed defect-mediated recombination at GBs but exciton-like transitions at GIs. In contrast, perovskite films with large grains followed an excellent power law, showing exciton-like recombination at both GIs and GBs. As expected, perovskite solar cells fabricated with large grains showed an increased efficiency with higher light absorption and higher charge extraction efficiency.
A deconvoluted PL approach to probe the charge carrier dynamics of the grain interior and grain boundary of a perovskite film for perovskite solar cell applications
Physical Chemistry Chemical Physics, Royal Society of Chemistry.
http://pubs.rsc.org/ru/content/articlelanding/2017/cp/c7cp01140g/unauth#!divAbstract
Carbon is inherently abundant in nature and relatively inexpensive, which can potentially reduce the manufacturing cost of solar cells. In recent years, carbon has been used as a hole transport layer or counter electrode in perovskite solar cells. Herein, we demonstrate that carbon can also be used as a charge transport layer capable of enhancing the energy conversion efficiency of a CH3NH3PbI3−xClx solar cell when carbon is combined with PCBM. Particularly, we have been able to deposit an ultra-flat carbon layer using an e-beam irradiation method, which exhibited much better conductivity than the competitive PCBM/C60 layer. In addition, quantitative analysis of interfacial charge dynamics shows that the quenching efficiency of PCBM/carbon is comparable to that of PCBM/C60 but better interface defect passivation and improved series and shunt resistances were observed when PCBM/carbon was employed. For the photovoltaic performance, the reference perovskite solar cell fabricated from the widely used PCBM/C60 has a power conversion efficiency (PCE) of 14% while the perovskite solar cell with PCBM/carbon has an increased PCE of 16%. Our results demonstrate the potential of the use of cost-effective carbon for perovskite solar cells, which could reduce production costs.
New PCBM/carbon based electron transport layer for perovskite solar cells
Physical Chemistry Chemical Physics, Royal Society of Chemistry.
http://pubs.rsc.org/en/content/articlelanding/2017/cp/c7cp02523h/unauth#!divAbstract
Even though perovskite based solar cells have been routinely fabricated with preheated perovskite solutions, currently the underlying mechanism of how the perovskite precursor solution temperature influences perovskite solar cells has not been studied yet. Therefore, we investigated the impacts of perovskite solution temperatures on charge carrier dynamics of perovskite film and perovskite solar cell performance that were quantitatively analyzed using steady-state photoluminescence (PL), time-resolved emission spectra (TRES), excitation-dependence of PL and current-voltage measurements. It is found that the perovskite solution temperature greatly influenced the morphologies, defect densities and states, and charge recombination dynamics of perovskite thin films. Particularly, steady-state and time-resoled PL measurements revealed that perovskite thin films prepared with the perovskite solution temperature around 70 °C produced lowest surface and bulk defect densities. In addition, it is found that the perovskite solution temperature around 70 °C led to exciton-like transitions while lower and higher solution temperatures led to defect-mediated recombination of perovskite thin films. Such recombination dynamics of perovskite films strongly influenced the light absorption and extraction efficiencies of photogenerated charge carriers which in turn influenced short-circuit current, fill factor, and open circuit voltage of perovskite solar cells. As a result, better photovoltaic performance of perovskite solar cells was observed when prepared with the precursor temperature around 70 °C.
Impact of perovskite precursor solution temperature on charge carrier dynamics and photovoltaic performance of perovskite based solar cells
Organic Electronics, North-Holland.
https://www.sciencedirect.com/science/article/pii/S1566119916305870
Grain interiors (GIs) and grain boundaries (GBs) of perovskites have been investigated using chemically, spatially, and temporally resolved measurements. Two dimensional (2D) chemical mapping measurements revealed the GBs consisted of the non-stoichiometric PbIx or CH3NH3PbIx, that were characterized by an absence of chloride, an enriched oxygen concentration, and a high density of iodide vacancies. In addition, steady-state 2D photoluminescence showed the bandgap broadening at the GBs while 2D lifetime mapping measurement suggested that the GBs indeed contained deep defect centers. However, it is found that defective GBs in perovskite materials do not act as high recombination sites for photogenerated charge carriers due to the bandgap broadening of non-stoichiometric PbIx or CH3NH3PbIx perovskites at the GB that forms the potential barriers for photo-generated charge carriers toward the GBs. As a consequence, the photo-generated charge carriers adjacent to the GBs will be easily repelled by the GBs, resulting in a greater reduction of the recombination of photogenerated charge carriers. This is one possible reason for the high performance of CH3HN3PbI3-xClx based solar cells.
Chemically, spatially, and temporally resolved 2D mapping study for the role of grain interiors and grain boundaries of organic-inorganic lead halide perovskites
Solar Energy Materials and Solar Cells, North-Holland.
https://www.sciencedirect.com/science/article/pii/S0927024816301805
For the high performance of perovskite solar cells, a thorough understanding of 
recombination dynamics of perovskites is essential. The special interest is the grain 
boundaries (GBs) and their recombination dynamics of CH3NH3PbI3-xClx perovskites. 
Herein, grain interiors (GIs) and grain boundaries (GBs) of perovskites have been 
investigated using chemically, spatially and temporally resolved measurements at the 
nanoscale. The local variations in steady-state photoluminescence (PL) and time-resolved 
lifetime are correlated to chemistries, to nanoscale morphologies, and to recombination 
kinetics. Particularly, CH3NH3PbI3-xClx perovskite gains were controlled using a hot-
casting technique, resulting in a smaller grain size of 1~ 2μm with many pinholes, and a 
larger grain size of> 15 μm with pinhole free morphologies. Localized chemical …
Recombination dynamics of the CH₃NH₃PbI3-xClx using chemically, spatially and temporally resolved 2D mapping
한국진공학회 학술발표회초록집 (2016).
http://www.dbpia.co.kr/Journal/ArticleDetail/NODE07056305
At present, the stability of perovskite solar cells has been studied in various environmental conditions. Nonetheless, an understanding of the degradation and its performance of CH3NH3PbI3-xClx perovskite solar cell is limited. Herein, we report the mechanical and structural degradation of CH3NH3PbI3-xClx perovskite films at room temperature as a function of time and thermal instability of perovskite solar cells during the heating and cooling processes. For mechanical degradation measurement, we used nanoindentation for CH3NH3PbI3-xClx perovskite films fabricated on FTO/PEDOT:PSS substrate. The hardness and elastic modulus of perovskite films were measured as a function of time. In addition, the mechanical degradation of perovskite thin films was correlated with X-ray diffraction, steady-state and time-resolved photoluminescence (PL). We also investigated the thermal instability of perovskite thin films and the irreversible performance of perovskite solar cells. Particularly, the irreversible performance of CH3NH3PbI3-xClx was analyzed by measuring the development of crystallinity, charge trapping/detrapping, trap depth, and PbI- phase while varying the temperature of perovskite films and solar cells between room temperature and 82 °C. Surprisingly, we found that the degradation of both perovskite films and solar cells occurred at ~70°C. Remarkably, even after the perovskite solar cell temperature cooled down to room temperature, the performance of solar cells continuously degraded. The underlying mechanism of irreversibly degraded performance of perovskite films and solar cells were explained in terms of the development of phase separation, increased trapping rates and deep trap depth of defect states of perovskite films.
Investigation of Degradation of Organometal Halide Perovskite Film and Solar Cell
In Meeting Abstracts, The Electrochemical Society, 2017
http://ma.ecsdl.org/content/MA2017-02/15/883.short
Currently, there is an ongoing strong discussion regarding the nature of organometallic CH3NH3PbI3-xClx perovskites for solar cells. In this work, perovskites have been investigated using chemically, spatially, and temporally resolved measurements. To investigate the carrier dynamics of perovskites, perovskite (CH3NH3PbI3-xClx) films were prepared using hot casting technique in which perovskite (CH3NH3PbI3-xClx) solution was prepared by dissolving equimolar ratios of lead iodide (PbI2, Sigma-Aldrich, 99%) and methylamine hydrochloride (MACl, Sigma-Aldrich) in N, N-dimethylformamide (DMF, Sigma-Aldrich, anhydrous, 99.8%) in 11% concentration. A lower hot-casting temperature (100 °C) resulted in smaller grain size, with typical grain sizes of 1~2µm. Hot-casting temperatures higher than 100 °C produced perovskite samples with larger grains of ~ more than tens of micrometers, which was confirmed by high-resolution scanning electron microscopy (SEM). The PL intensity and peak-position mapping image of submicron-scale were performed using confocal micro-spectroscopy. In-plane spatial resolution of ~380nm was indicated by an objective lens with numerical aperture of 0.7 and a solid-state laser with 405nm wavelength for the excitation. The signal collected by the objective lens was detected by a thermoelectrically cooled CCD detector. For the analysis of time resolved PL (TRPL), multifunctional confocal microscopy including a time-correlated single photon counting (TCSPC) system was employed. In addition, 2-D energy-dispersive X-ray (EDS) measurement was performed to elucidate the distribution of chemistries for the surface of perovskites, which were correlated to spatially and temporally resolved PL. Particularly, the carrier dynamics between grain interiors and grain boundaries were systematically investigated.
Investigation of Dynamics of Perovskites using Chemically, Spatially and Temporally Resolved 2D Mapping
In Meeting Abstracts, The Electrochemical Society (2016).
http://ma.ecsdl.org/content/MA2016-02/15/1405.short
Awarded travel grant for attending  the 2019 SVC Technical Conference (Techcon) which will be held in Long Beach, California from April 27 to May 2, 2019.
Society of Vacuum Coaters Foundation
SVC Technical Conference (Techcon) Travel award
For outstanding research in the academic year of 2017.
ECE, Old Dominion University
Ph.D. Researcher of the Year
Awarded financial aid during Fall 2018 and Spring 2019 from “The Bernard Henry Fund” of the Society of Vacuum Coaters Foundation to obtain advanced physical-modeling software for my research.
Society of Vacuum Coaters Foundation
SVC foundation Research Scholarship
Outstanding academic performance during under-graduation
Amar Ekushey Hall, University of Dhaka
Merit Scholarship
Characterization of Materials
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Introduction to Solar Cells
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Non-Thermal Plasma Engineering
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Semiconductor Characterization
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Semiconductor Process Technology
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Solid State Electronics
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Interface engineering of highly efficient organic-inorganic hybrid perovskite solar cells
PhD Dissertation Topic
Simulation Study of GaN/Al(1-x)Ga(x)N Quantum Well (QW) operating in the UV Region
MS thesis
Ballistic Transport in Schottky-Barrier and MOSFET-like Carbon Nanotube Field Effect Transistors: Modeling, Simulation and Analysis.
BS project
Health
American Red Cross
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Blood Donation
Education
ICIEV 2013
Worked as a volunteer in the 2nd International Conference on Informatics, Electronics
& Vision (ICIEV’13)
Student Volunteer
ExpertRating Inc.
www.expertrating.com
Six Sigma Green Belt Certification
http://www.expertrating.com/reports/transcript.aspx?transcriptid=3535928
https://www.linkedin.com/in/sharif-ullah-086b8755
Norfolk, VA
Sharif Ullah
Security Researcher | Cyber Risk and Threat Modeling | Energy Security - Open for full-time Position
https://www.linkedin.com/in/ismael-juson-a3bb733a
Beaverton, OR
Ismael Juson
Project Manager at Intel Corporation
https://www.linkedin.com/in/majhar999
Hillsboro, OR
Mohammad Majharul Islam
Staff software engineer at Intel with experience in computer architecture, performance modeling, machine learning and AI. Constantly on the lookout for new challenges and opportunities to do something wonderful.
https://www.linkedin.com/in/mohammad-ashraf-bhuiyan-11725b16
Hillsboro, OR
Mohammad Ashraf Bhuiyan
Senior Software Engineer, AI at Intel Corporation
https://www.linkedin.com/in/ismael-lopez-mendez-4a566271
Beaverton, OR
Ismael Lopez Mendez
Engineering Technician at SFA Design Group, LLC
https://in.linkedin.com/in/ismail-rizvi-3a24a655
Bengaluru
Ismail Rizvi
Senior Software Engineer at AMD
https://www.linkedin.com/in/abid3tanzil
Portland, Oregon Metropolitan Area
Abid Tanzil, Ph.D.
Chemical engineer | Bioenergy process design | Techno-economic analyst | Life cycle analyst | Market analyst
https://www.linkedin.com/in/daud-emon
Hillsboro, OR
Daud Emon
Process Engineer at Intel Corporation
https://www.linkedin.com/in/khalida-harun
Austin, TX
Khalida Binte Harun
Validation Engineer II at ICU Medical
https://www.linkedin.com/in/sbashar
Portland, Oregon Metropolitan Area
Sunayna Bashar
Process Engineer  at Intel Corporation
https://bd.linkedin.com/in/sadafmonjur
Bangladesh
Mohammed Sadaf Monjur
Graduate Research Assistant at Texas A&M University
https://www.linkedin.com/in/shaima-nahreen-8bb88739
Portland, Oregon Metropolitan Area
Shaima Nahreen
Staff Engineer, Packaging R&D at Intel Corporation
https://www.linkedin.com/in/rafiqislamcop
Houston, TX
Rafiq Islam, PhD
Process/Project and Operations Support Engineer
https://www.linkedin.com/in/turna-barua
Irvine, CA
Turna Barua
Chemical Engineering | Materials Science | Research & Development | Process Development | Scientist | Formulation| PhD candidate
https://www.linkedin.com/in/yue-yu-7a08a8134
Hillsboro, OR
Yue Yu
Ph.D., Process Engineer at Intel Corporation
https://www.linkedin.com/in/qusay-bkour
Portland, Oregon Metropolitan Area
Qusay Bkour, PhD
Process Technology Development Engineer at Intel Corporation
https://www.linkedin.com/in/fatemeh-rahimi
Chandler, AZ
Fatemeh Rahimi
Sr. R&D Engineer at Intel Corporation
https://www.linkedin.com/in/amriteshrai
Hillsboro, OR
Amritesh Rai
Process Integration Engineer @ Intel ▪️ STEM Mentor/Volunteer ▪️ IEEE Member ▪️ UT Cockrell School PhD ▪️ Ohio State Undergrad ▪️ The Doon School
https://www.linkedin.com/in/sujay-singh
Mountain Top, PA
Sujay Singh
Senior Principal Reliability Engineer  at ON Semiconductor
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I'm happy to announce I've been awarded the prestigious Dr. Hussein Abdel-Wahab Memorial Graduate Fellowship by the ODU Computer science department.
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I am still amazed to be in my dream job. Love the energy and enthusiasm on the Intel Board of Directors. Thanks Omar Ishrak and team for your…
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Ready to engage with political, business, financial, research, and industry leaders from the #semiconductor manufacturing industry? Don’t miss out on…
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Bangladesh
Abdullah Al Mamun
Asst. General Manager,Estimation at bti (building technology & ideas ltd.)
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Bangladesh
Abdullah-Al Mamun
Associate Professor at Noakhali Science and Technology University
https://bd.linkedin.com/in/hellomamun03
Dhaka, Bangladesh
ABDULLAH AL MAMUN
Motion & Graphic Design Trainer | Creative IT Institute | Management | Skill Development | BRAC
https://bd.linkedin.com/in/abdullah-al-mamun-b3988753
Bangladesh
Abdullah Al MAMUN
Manager, Prepress (Design) Department at Bori Garment Accessories Co., Ltd.
https://bd.linkedin.com/in/abdullah-al-mamun-7309b674
Dhaka, Bangladesh
Abdullah Al Mamun
Area Manager, Customer Development, Water & Air Wellness, Unilever Bangladesh Ltd.
Perovskite Solar Cell (PSC)
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https://www.linkedin.com/groups/8285598
Applied Physics,Electronics & Communication Engineering,University of Dhaka ,Bangladesh
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https://www.linkedin.com/groups/2391318