A5070309101- ZnO doping and properties
- Ga2O3 and related materials
- GaN-based semiconductor devices and materials
- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- Perovskite Materials and Applications
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Laser-Ablation Synthesis of Nanoparticles
- Gas Sensing Nanomaterials and Sensors
- Graphene research and applications
- Chalcogenide Semiconductor Thin Films
- Plasma Applications and Diagnostics
- Solid-state spectroscopy and crystallography
- Thin-Film Transistor Technologies
- Carbon Nanotubes in Composites
- Polymer Nanocomposite Synthesis and Irradiation
- Diamond and Carbon-based Materials Research
- Electronic and Structural Properties of Oxides
- Surface Modification and Superhydrophobicity
- MXene and MAX Phase Materials
- Conducting polymers and applications
- Nanoplatforms for cancer theranostics
- Plasma Diagnostics and Applications
King Abdullah University of Science and Technology
2017-2023
Taif University
2020-2022
King Saud bin Abdulaziz University for Health Sciences
2022
Princess Nourah bint Abdulrahman University
2022
Gwangju Institute of Science and Technology
2020
University of Ulster
2011-2016
KTH Royal Institute of Technology
2011
Centre for Sustainable Energy
2006
Lead halide perovskite solar cells (PSCs) have advanced rapidly in performance over the past decade. Single-crystal PSCs based on micrometers-thick grain-boundary-free films with long charge carrier diffusion lengths and enhanced light absorption (relative to polycrystalline films) recently emerged as candidates for advancing further toward their theoretical limit. To date, preferred method grow MAPbI3 single-crystal involves solution processing at temperatures ≳120 °C, which adversely...
Zero-dimensional perovskite-related structures (0D-PRS) are a new frontier of perovskite-based materials. 0D-PRS, commonly synthesized in powder form, manifest distinctive optical properties such as strong photoluminescence (PL), narrow emission line width, and high exciton binding energy. These make 0D-PRS compelling for several types optoelectronic applications, including phosphor screens electroluminescent devices. However, it would not be possible to rationally design the chemistry...
Hydrogen production via photoelectrochemical water-splitting is a key source of clean and sustainable energy. The use one-dimensional nanostructures as photoelectrodes desirable for applications due to the ultralarge surface areas, lateral carrier extraction schemes, superior light-harvesting capabilities. However, unavoidable states nanostructured materials create additional charge trapping centers energy barriers at semiconductor-electrolyte interface, which severely reduce...
Abstract High‐quality epitaxy consisting of Al 1− x Ga N/Al y N multiple quantum wells (MQWs) with sharp interfaces and emitting at ≈280 nm is successfully grown on sapphire a misorientation angle as large 4°. Wavy MQWs are observed due to step bunching formed the edges. A thicker QW width accompanied by greater accumulation gallium near macrostep edge than that flat‐terrace 4° misoriented sapphire, leading generation potential minima respect their neighboring QWs. Consequently,...
The rapid development of halide perovskite synthesis offers the opportunity to fabricate high-quality nanocrystals (NCs), whose structural uniformity can lead assembled supra-structures with improved device performance and novel collective properties. Light is known significantly affect structure properties perovskites plays a crucial role in growth assembly their crystals. Nevertheless, light-induced mechanisms NCs are not yet clearly understood. In this work, we performed systematic study...
Enhanced ultraviolet (UV) photodetectors (PDs) with high responsivity comparable to that of visible and infrared are needed for commercial applications. n-Type ZnO nanotubes (NTs) high-quality optical, structural, electrical properties on a p-type Si(100) substrate successfully fabricated by pulsed laser deposition (PLD) produce UV PD responsivity, the first time. We measure current-voltage characteristics device under dark illuminated conditions demonstrated stability (that reaches ∼101.2 A...
A high-performance vertically injected broadband UV-to-IR photodetector based on Gd-doped ZnO nanorods (NRs)/CH3NH3PbI3 perovskite heterojunction was fabricated metal substrates. Our perovskite-based is sensitive to a broad spectral range, from ultraviolet infrared light region (λ = 250-1357 nm). Such structure leads high photoresponsivity of 28 and 0.22 A/W, for white IR illumination, respectively, with detectivity values 1.1 × 1012 9.3 109 Jones. Optical characterizations demonstrate that...
All-inorganic lead halide perovskites are promising materials for many optoelectronic applications. However, two issues that arise during device fabrication hinder their practical use, namely, inadequate continuity of coated inorganic perovskite films across large areas and inability to integrate these with traditional photolithography due poor adhesion wafers. Herein, the first time, address issues, we show a room-temperature synthesis process employed produce CsPbBr3 nanocrystals...
Smart solar-blind UV-C band photodetectors suffer from low responsivity in a self-powered mode. Here, we address this issue by fabricating novel enhanced photodetector array based on solution-processed n-ZnO quantum dots (QDs) functionalized p-CuO micro-pyramids. Self-assembled catalyst-free micro-pyramid arrays are fabricated pre-ablated Si substrate pulsed laser deposition without need for catalyst layer or seeding, while the QDs synthesized femtosecond-laser ablation liquid technique. The...
A facile method to synthesize a TiO2/PEDOT:PSS hybrid nanocomposite material in aqueous solution through direct current (DC) plasma processing at atmospheric pressure and room temperature has been demonstrated. The dispersion of the TiO2 nanoparticles is enhanced TiO2/polymer with distinct core shell structure have obtained. Increased electrical conductivity was observed for treated nanocomposite. improvement properties due stability liquid polymer microplasma nanoparticles. Both induced...
Abstract High‐energy radiation detectors such as X‐ray with low light photoresponse characteristics are used for several applications including, space, medical, and military devices. Here, an indirect bandgap inorganic perovskite‐based detector is reported. The nature of perovskite materials revealed through optical characterizations, time‐resolved photoluminescence (TRPL), theoretical simulations, demonstrating that the differences in temperature‐dependent carrier lifetime related to CsPbX...
Solution-processed deep ultraviolet (DUV) photodetectors based on wide band gap oxide semiconductors (WBGS) working in the <280 nm wavelength range are drawing increasing attention of research community because their cost-effective production and potential use diverse applications. Here, we report synthesis novel core-shell amorphous gallium nanoparticles (NPs) (a-Ga2Ox/GaOx NPs) that have not been previously obtained. The NPs were synthesized from nitride using femtosecond laser ablation...
Underwater wireless optical communication (UWOC) can offer reliable and secure connectivity for enabling future internet-of-underwater-things (IoUT), owing to its unlicensed spectrum high transmission speed. However, a critical bottleneck lies in the strict requirement of pointing, acquisition, tracking (PAT), effective recovery modulated signals at receiver end. A large-area, bandwidth, wide-angle-of-view photoreceiver is therefore crucial establishing high-speed yet link under...
A highly crystalline single- or few-layered 2D-MoS2 induces a high dark current, due to which an extremely small photocurrent generated by few photons can be veiled distorted. In this report, we show that suppression in the current with enhancement of 2D-based photodetector, is prerequisite for photoresponse enhancement, achieved constructing ideal p-n junction based on functionalizing n-type p-type quantum dots (QDs). Highly solution-processed manganese oxide QDs (MnO QDs) are synthesized...
Understanding defect chemistry, particularly ion migration, and its significant effect on the surface's optical electronic properties is one of major challenges impeding development hybrid perovskite-based devices. Here, using both experimental theoretical approaches, we demonstrated that surface layers perovskite crystals may acquire a high concentration positively charged vacancies with complementary negatively halide ions pushed to surface. This charge separation near generates an...
Solar-blind self-powered UV-C photodetectors suffer from low performance, while heterostructure-based devices require complex fabrication and lack p-type wide band gap semiconductors (WBGSs) operating in the region (<290 nm). In this work, we mitigate aforementioned issues by demonstrating a facile process for high-responsivity solar-blind photodetector based on p-n WBGS heterojunction structure, under ambient conditions. Here, structures n-type ultra-wide WBGSs (i.e. both are characterized...
Quantum confined silicon nanocrystals (Si-ncs) exhibit intriguing properties due to silicon's indirect bandgap and their highly reactive surfaces. In particular the interplay of quantum confinement with surface effects reveals a complex scenario, which can complicate interpretation Si-nc prediction corresponding behaviour. At same time, complexity different mechanisms in Si-ncs offer great opportunities characteristics that may not be achievable other nano-systems. this context, variety...
The photoinduced entropy of InGaN/GaN p-i-n nanowires was investigated using temperature-dependent (6–290 K) photoluminescence. We also analyzed the photocarrier dynamics in InGaN active regions time-resolved An increasing trend amount generated system above 250 K observed, while we observed an oscillatory below that stabilizes between 200 and K. Strong exciton localization indium-rich clusters, carrier trapping by surface defect states, thermodynamic effects were examined related to...
Abstract 2D molybdenum disulfide (MoS 2 ) possesses excellent optoelectronic properties that make it a promising candidate for use in high‐performance photodetectors. Yet, to meet the growing demand practical and reliable MoS photodetectors, critical issue of defect introduction interface between exfoliated electrode metal during fabrication must be addressed, because defects deteriorate device performance. To achieve this objective, an atomic layer‐deposited TiO interlayer (between...
Abstract Wide bandgap semiconductor (WBGS)‐based deep UV (DUV) devices lag behind those operating in the visible and IR range, as no stable p‐type WBGS that operates DUV region (<300 nm) presently exists. Here, solution‐processed manganese oxide quantum dots (MnO QDs) are explored. Highly crystalline MnO QDs synthesized via femtosecond‐laser ablation liquid. The nature of these is demonstrated by Kelvin probe field effect transistor measurements, along with density functional theory...
Two different atmospheric pressure microplasma systems are discussed and used for the synthesis surface engineering of a range nanomaterials. Specifically gas-phase approach from vaporized tetramethylsilane has been to synthesize silicon carbide nanoparticles with diameters below 10 nm. A system that interfaces liquid solution then surfactant-free electrically stabilized gold varying size. similar microplasma-liquid finally successfully tailor properties reduce graphene oxide into graphene....
One-dimensional (1D) structures-based UV-light-emitting diode (LED) has immense potential for next-generation applications. However, several issues related to such devices must be resolved first, as expensive material and growth methods, complicated fabrication process, efficiency droop, unavoidable metal contamination due catalyst that reduces device efficiency. To overcome these obstacles, we have developed a novel method obtaining high-quality hexagonal, well-defined, vertical 1D Gd-doped...
Demonstration of silicon nanocrystal down-conversion enhancement in PTB7:[70]PCBM based solar cells.
We have demonstrated that three-dimensional (3D) surface engineering of silicon nanocrystals (SiNCs) by direct current microplasma processing in water with poly(3,4-ethylenedioxythiophene) doped poly(styrenesulfonate) (PEDOT:PSS) can lead to nanocomposites enhanced optoelectronic performance. Specifically, we successfully shown improved photoluminescence properties SiNCs inside water-based solution. The results also confirm become stable potential application impact for biorelated...