Structural, Optical and Electrical Properties of Lead Iodide Synthesized using the Golden Rain Method Shahad Jassim Abdul Sahib, Omar Adnan Ibrahim Semiconductors, 2025 Abstract The present work aims to prepare thin films of lead iodide (PbI2) using the golden rain method. The optical, structural and electrical properties of these films were studied. The X-Ray diffraction (XRD) patterns showed that the structure of PbI2 is polycrystalline and has a nanostructure with sizes up to 3 nm, which was calculated using the Williamson–Hall formula, while the scanning electron microscopy results showed that the PbI2 structures have average sizes ranging from 72.2 to 111.8 nm. The optical properties results showed that the absorption peak was in the ultraviolet region at a wavelength of 290 nm. Finally, the electrical properties study using the Hall effect showed that the resulting material PbI2 is a p-type semiconductor.
Optimizing charge transport in hybrid GaN-PEDOT:PSS/PMMADevice for advanced application Makram A. Fakhri, Evan T. Salim, Marwah R. Ketab, Haneen D. Jabbar, Omar A. Ibrahim, Ahmad S. Azzahrani, Mohammed Jalal AbdulRazzaq, Raid A. Ismail, Ali Basem, Forat H. Alsultany, Subash C. B. Gopinath Scientific Reports, 2024 Organic–inorganic hybrid light-emitting devices have garnered significant attention in the last few years due to their potential. These devices integrate the superior electron mobility of inorganic semiconductors with the remarkable optoelectronic characteristics of organic semiconductors. The inquiry focused on analyzing the optical and electrical properties of a light-emitting heterojunction that combines p-type GaN with organic materials (PEDOT, PSS, and PMMA). This heterojunction is an organic–inorganic hybrid. The procedure entailed utilizing a spin-coating technique to apply a layer of either poly(methyl methacrylate) (PMMA) or a mixture of PMMA and poly(3,4ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT: PSS) onto an indium tin oxide (ITO) substrate. Subsequently, different Nd:YAG laser pulses (200, 250, and 300 pulses) were used to administer a GaN inorganic layer onto the prepared organic layer using a pulsed laser deposition approach. Subsequently, the thermal evaporation technique was employed to deposit an aluminum electrode on the top of the organic and inorganic layers, while laser pulses were fine-tuned for optimal performance. The Hall effect investigation verifies the p-type conductivity of the GaN material. The electroluminescence studies confirmed the production of blue light by the GaN-based devices throughout a range of voltage situations, spanning from 45 to 72 V.
Blue Organic-Inorganic Light Emitting Diode Based on Electroluminescence CdS Nanoparticle Asama N. Naje, Omar A. Ibrahim, Estabraq Talib Abdullah Iraqi Journal of Science, 2023 A hybrid cadmium sulfide nanoparticles (CdSNPs) electroluminescence (EL) device was fabricated by Phase – Segregated Method and characterized. It was fabricated as layers of (ITO/poly-TPD:CdS ) and (ITO/poly-TPD:CdS /Alq3). Poly-TPD is an excellent Hole Transport Layer (HTL), CdSNPs is an emitting layer and Alq3 as electron transport layer (ETL). The EL of Organic-Inorganic Light Emitting Diode (OILED) was studied at room temperature at 26V. This was achieved according to band-to-band transition in CdSNPs. From the I-V curve behavior, the addition of Alq3 layer decreased the transfer of electrons by about 250 times. The I-V behavior for (poly-TPD/CdS) is exponential with a maximum current of 4500 µA. While, the current is constant for (poly-TPD:CdS /Alq3) and the maximum current was 16.5 µA. Semiconductor nanoparticles like CdS are attractive for fabricating hybrid LEDs with spectrally pure color, low operating voltage values, and short-wavelength electro-luminescence, needed for the RGB devices. The correlated color temperature (CCT) was equal to (1700 oK) for the emitted blue light.
Defect energy state for ZnO nanoparticals synthesis by chemical method Istabrak A. Abed Abbas, Omar A. Ibrahim Aip Conference Proceedings, 2021 X-ray diffraction, optical absorption by UV-vis spectrum, and photoluminescence spectroscopy(pl) analysis were characteristic of the powder.XRD observations The nano - particles are structured in hexagonal lattice, The UV-vis absorption range reveals an absorption band for 60,90,120 minutes at 333,335,337 nm, these peaks are blue shift it’s attributable to ZnO nanoparticles effect and see the more emission peaks from the photoluminescence spectrum, these peaks are the evidence from the (defect and nanostructure effects) in the structure. finally, studied the native defect states from the photoluminescence for different time reaction.
Capacitance and resistivity measurements of polythiophene /metallic nanoparticles-based humidity sensors Estabraq Talib Abdullah, Omar A. Ibrahim Iraqi Journal of Science, 2021 Capacitive–resistive humidity sensors based on polythiophene (P3HT) organic semiconductor as an active material hybrid with three types of metallic nanoparticles (NP) (Ag, Al, and Cu) were synthesized by pulsed laser ablation (PLA). The hybrid P3HT/metallic nanoparticles were deposited on indium-tin-oxide (ITO) substrate at room temperature. The surface morphology of theses samples was studied by using field emission scanning electron micrographs (FE-SEM), which indicated the formation of nanoparticles with grain size of about 50nm. The electrical characteristics of the sensors were examined as a function of the relative humidity levels. The sensors showed an increase in the capacitance with variation in the humidity level. While the resistivity While the resistivity decrease nonlinearity in the variation of humidity level from 10% to 100%.. The results show that the recovery and response times were higher for the Al/P3HT/Cu/Al sensor compared with those of the other nanoparticles.
