Dr. AdelDiyaf

Physics Faculty of Science

Full name

Dr. Adel G A Diyaf


Doctor of Phiosophy

Academic Rank

Associate Professor


My professional career has been characterized by academic administration and leadership, amidst physics research and multidisciplinary teaching. As soon as I obtained my bachelor's degree from the Department of Physics at the Faculty of Science, University of Tripoli in 1997, I was selected to work as a teaching assistant in the Department of Physics. At the same time, I developed some administrative abilities by working in Examination Office and in academic supervision for undergraduate students. After my master's degree at the University of Tripoli in 2007, I became an Assistant Lecturer, which was another chance for me to develop my administrative skills as I joined the Study and Examination Committee in the Department of Physics to help in supervising the educational process in the Department. I received a scholarship to complete my PhD studies in solid-state physics, specifically semiconductors, from 2010-2014. I studied flexible solar cells at Heriot Watt University in Edinburgh, Scotland, and during this time was also awarded support from Power Textiles to develop flexible solar cells. Despite this, I have always believed in cross-disciplinary education; upon returning to the University of Tripoli, I joined the Department of Physics but taught physics courses to students at the Colleges of Science, Engineering, and Medicine. As an assistant professor, I also currently teach renewable energies courses in the only multidisciplinary graduate program at the University of Tripoli: the Masters of Energy Management program at the College of Engineering. In 2014, I joined the Study and Examination Office in the Department of Physics. In 2016, I was put in charge of this Office. This allowed me to develop administrative and leadership skills. With my success in managing the Examination Office, I was elected to head the Department of Physics at the Faculty of Science in 2017. My main responsibilities were to lead, manage and follow up on the duties of the faculty and technicians in the Department of Physics. I was also tasked with ensuring good professional practices, standards, and quality of teaching and learning as well as the development of the Department of Physics. I held and led periodic department meetings, and was responsible for approving official documents and results. Since the end 2019, I have been the Director of the International Cooperation Office at the University of Tripoli. One of my main responsibilities is to lead the Office, establish contacts, and develop cooperation with local, regional, and international bodies and organizations working in the field of higher education. Our office reports directly to the President of the University, facilitating and streamlining all contact with international institutions, e.g., for TEMPUS and ENBRAIN funded by the European Commission, or WHEEL funded by Erasmus+).

Contact Information

روابط التواصل


الكل منذ 2017


Doctor of Phiosophy

6 ,2014

Master degree

7 ,2007

Bachelor Degree

6 ,1997


Director of International Cooperation Office at the University of Tripoli - UoT

Director of International Cooperation Office
2020 - 0


2017 - 2020


2016 - 2018


Contacts on polyester textile as a flexible substrate for solar cells

In the present work, the authors have studied conductive surfaces on polyester fabrics by using two types of commercially available conductive polymers; polyaniline and poly (3,4-ethylenedioxythiophene)-poly (styrenesulphonate) (PEDOT: PSS) with 100 nm aluminium thin film evaporated on top of the polymer so the fabric becomes a conductive substrate for inorganic thin film solar cells. Conductive polymer surfaces on woven polyester fabrics were obtained by knife-over-table coating technique. Surface resistivities for polyaniline and PEDOT: PSS coated fabrics were measured and found in the range of 400 × 103 and 1 × 103 Ω/□, respectively. Thermal stability tests were carried out to evaluate the effect of specific periods of heal treatment at different elevated temperatures on resistance of polymer coated conducting textiles. PEDOT: PSS exhibited better stability than panipol. According to long term tests, PEDOT: PSS coated samples showed improvement in conductivity over 3 days whereas panipol showed the opposite. Transmission Line Model tests were performed to measure aluminium/polymer contact resistances which were found to be 120 × 103 Ω for polyaniline and about 46.3 Ω for PEDOT: PSS. Mechanical bending tests for aluminium/PEDOT: PSS/fabric samples showed that the polymer can maintain the conductivity of samples by bridging micro-cracks in the metal film. arabic 10 English 59
Adel G A Diyaf, John Wilson, Robert R. Mather(1-2014)
Publisher's website

Manipulating hybrid structures of polymer/a-Si for thin film solar cells

A series of uniform polymer/amorphous silicon hybrid structures have been fabricated by means of solution-casting for polymer and radio frequency excited plasma enhanced chemical vapour deposition for amorphous silicon (a-Si:H). Poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) functioned as a photoactive donor, while the silicon layer acted as an acceptor. It is found that matching the hole mobility of the polymer to the electron mobility of amorphous silicon is critical to improve the photovoltaic performance from hybrid cells. A three-layer p-i-n structure of ITO/PEDOT:PSS(200 nm)/i-Si(450 nm)/n-Si(200 nm)/Al with a power conversion efficiency of 4.78% under a standard test condition was achieved. arabic 11 English 61
Adel Diyaf, Zhiqun He, John I. B. Wilson, Ying Peng(3-2014)
Publisher's website

A preliminary development in hybrid a-silicon/polymer solar cells

Amorphous undoped intrinsic silicon, B-doped silicon and P-doped silicon hybrid bilayer structures with poly(3-hexylthiophene) have been fabricated and their photovoltaic responses have been investigated. Open-circuit voltages and fill factors of the devices are moderate, but strongly dependent on the doping type of a-Si:H films. The highest available open-circuit voltage from the hybrid solar cells within this investigation is 1.23 V in a standard test condition. Both inorganic and organic semiconducting layers contribute to the photocurrent generation. The short-circuit currents appear to be limited by unbalanced charged carriers collected from different sides of the semiconductors, which indicates a way forward in device optimization. arabic 9 English 56
Adel Diyaf, Zhiqun He, John I.B. Wilson, Anna H.N. Lind, Ying Peng, Zhi Zhang(9-2013)
Publisher's website

Calculation of the emission power distribution of microstructured OLEDs using the reciprocity theorem

Integrating photonic microstructures into organic light-emitting diodes (OLEDs) has been a widely used strategy to improve their light out-coupling efficiency. However, there is still a need for optical modelling methods which quantitatively characterise the spatial emission pattern of microstructured OLEDs. In this paper, we demonstrate such rigorous calculation using the reciprocity theorem. The calculation of the emission intensity at each direction in the far field can be simplified into only two simple calculations of an incident plane wave propagating from the far field into a single cell of the periodic structure. The emission from microstructured OLED devices with three different grating periods was calculated as a test of the approach, and the calculated results were in good agreement with experiment. This optical modelling method is a useful calculation tool to investigate and control the spatial emission pattern of microstructured OLEDs. arabic 12 English 89
Adel Diyaf, Emiliano R. Martins, John I.B. Wilson, Graham A. Turnbull, Ifor D.W. Samuel, (7-2015)
Publisher's website

A preliminary investigation into hybrid photovoltaic cells with organic phthalocyanines and amorphous silicon heterojunction

Hybrid photovoltaic cells take the advantages of silicon in charge carrier separation and transport and organic dyes in strong complementary light absorption. Photovoltaic responses from a set of hybrid solar cells based on amorphous silicon and phthalocyanine dyes of double- or triple-layer heterojunction structures were investigated, which were found to have thickness dependence with the organic active layers. It was found that the photocurrent contributions from organic layers are limited, although they are strong light absorbers. The main photocurrent contributions are from the silicon counterpart. arabic 13 English 111
Adel Diyaf, Huan Zhao, Zhiqun He, Xiaojin Zhang, Zhi Zhang, John I B Wilson, Anna H N Lind(4-2015)
Publisher's website

Simulation of Electromagnetic Waves in Free Space

In this paper, considers a solution of Maxwell's curl equations by using the finite-difference time-domain (FDTD) method. We simulated electromagnetic waves propagation in free space. The electric and magnetic fields generated in two cases to make a comparison between the models. All models were computed using the same parameters. This study showed that the intensities of the fields affected when adding three excited sources pointed in three locations. However, it was noted that three sources placed in the same location improved the distributions of the fields. Therefore, this difference in excitation position leads to change the image intensity distribution. arabic 7 English 43
Adel G Diyaf, Sedig S. Farhat(4-2017)
full text

Inorganic Thin Film Materials for Solar Cell Applications

Due to the global concerns on the depletion of fossil fuels and the negative effect of their use in environmental pollution and climate change, renewable energy resources are increasingly in demand. Global solar power generation has almost doubled during the last 2 years with countries, such as China, leading the way with huge investments. The first generation of solar cells are either single or multi crystalline silicon, and still have 59% market share; the second (amorphous silicon, copper indium gallium selenide, and cadmium telluride) is approaching in terms of cost and efficiency; and the third (dye sensitized solar cells, organic photovoltaic, quantum dots, and perovskite) all show promise yet are still to come to market. However, future solar cells (using copper oxide and zinc oxide) featuring the regular intrusion of one junction layer into the other in order to massively improve junction contact area are of particular promise. arabic 7 English 50
Adel Diyaf, Yahya Alajlani, Abed Alaswad, Frank Placido, Des Gibson(1-2018)
Publisher's website

Modeling effects of outlet nozzle geometry on swirling flows in gas turbine

Swirl stabilised combustion is one of the most successful technologies for flame stabilisation in gas turbine combustors. Lean premixed combustion systems allow the reduction of NOx coupled with fair flame stability. The swirl mechanism produces an aerodynamic region known as central recirculation zone (CRZ) providing a low velocity region where the flame speed matches the flow velocity, thus anchoring the flame whilst serving to recycle heat and active chemical species to the root of the former. Another beneficial feature of the CRZ is the enhancement of the mixing in and around this region. However, the mixing and stabilisation processes inside of this zone have shown to be extremely complex. The level of swirl, burner outlet configuration and combustor expansion are very important variables that define the features of the CRZ. The complex fluid dynamics and lean conditions pose a problem for stabilization of the flame. The problem is even more acute when alternative fuels are used for flexible operation. Therefore, in this paper swirling flame dynamics are investigated using computational fluid dynamics (CFD) with commercial software (ANSYS). A new generic swirl burner operated under lean-premixed conditions was modelled. A variety of nozzles were analysed using isothermal case to recognize the the behavers of swirl . The investigation was based on recognising the size and strength of the central recirculation zones. The dimensions and turbulence of the Central Recirculation Zone were measured and correlated to previous experiments. The results show how the strength and size of the recirculation zone are highly influenced by both the shear layer surrounding the Central Recirculation Zones (CRZ) and outlet configurations. arabic 11 English 64
Adel Diyaf, Hesham Baej, Adel Akair, Salem Adeilla, Abdurahman Kraiem(9-2018)
Publisher's website

Assessment of different Growth Techniques of Strained Germanium Heterostructures for Electronic and spintronic Devices

This paper, emphasis different growth techniques of two-dimensional hole gas of strained germanium (sGe) heterostructure, molecular beam epitaxy (MBE) and chemical vapor deposition (CVD). sGe heterostructure has become an important material as a replacement material to Silicon in P-type devices because of its higher hole mobility and lower effective mass. Researchers study this material in terms of electrical and spintronic devices according to technology demands for devices with higher efficiency and low power consumption. High hole mobility up to 1×10cm/Vs at temperature of 1.5 K has been reported for normal structure declaring high quality samples with low density dislocation and low interface roughness. arabic 14 English 105
Adel Diyaf, A.H. A. Hassan , U. Elfurawi , A. E. Abubkr (6-2019)
full text Publisher's website