Safayet Ahmed

ORCID: 0000-0003-3292-3929
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Research Areas
  • Advanced Fiber Laser Technologies
  • Solar-Powered Water Purification Methods
  • Perovskite Materials and Applications
  • Solar Thermal and Photovoltaic Systems
  • Membrane Separation Technologies
  • Photonic Crystal and Fiber Optics
  • 2D Materials and Applications
  • Semiconductor materials and devices
  • Laser-Matter Interactions and Applications
  • Advancements in Semiconductor Devices and Circuit Design
  • Chalcogenide Semiconductor Thin Films
  • Nonlinear Optical Materials Research
  • Advanced Fiber Optic Sensors
  • Quantum Dots Synthesis And Properties
  • Prosthetics and Rehabilitation Robotics
  • Solid State Laser Technologies
  • Stroke Rehabilitation and Recovery
  • GaN-based semiconductor devices and materials
  • Photonic and Optical Devices
  • Copper-based nanomaterials and applications
  • Advanced Photocatalysis Techniques
  • IoT-based Smart Home Systems
  • Nanowire Synthesis and Applications
  • Silicon Carbide Semiconductor Technologies
  • Assistive Technology in Communication and Mobility

Oregon State University
2024-2025

Hong Kong Polytechnic University
2020-2024

Shenzhen Polytechnic
2020-2024

City University of Hong Kong, Shenzhen Research Institute
2022

American International University-Bangladesh
2015-2020

Advanced Micro Devices (United States)
2004

Advanced Micro Devices (Canada)
2003

While the selection of new "backbone" device structure in era post-planar CMOS is open to a few candidates, FinFET and its variants show great potential scalability manufacturability for nanoscale CMOS. In this paper we report design, fabrication, performance, integration issues double-gate FinFETs with physical gate length being aggressively shrunk down 10 nm fin width 12 nm. These MOSFETs are believed be smallest transistors ever fabricated. Excellent short-channel performance observed...

10.1109/iedm.2002.1175825 article EN 2003-06-26

A platinum-based organometallic polymer is developed with a broad absorption spectrum and high photo-to-thermal conversion capability, which can be used to fabricate solar evaporator for seawater desalination operational stability.

10.1039/d3ta07980e article EN Journal of Materials Chemistry A 2024-01-01

Abstract A chemically treated luffa sponge (LS) derived from the ripe fruit of Luffa cylindrica (LC) plant is investigated as an efficient solar photothermal conversion material for water purification applications very first time. Hydrophilicity and absorbance LS are enhanced by dopamine treatment candle soot surface coating. The fabricated modified (SM‐LS) leads to a superb evaporation rate high 1.30 kg m −2 h −1 , which five times higher than that freshwater under 1 sun illumination....

10.1002/adsu.202000291 article EN Advanced Sustainable Systems 2021-02-26

With the advancement of civilization, water purification, as well management and disposal ever-increasing municipal solid waste (MSW), e-waste, have become global concerns. To address these issues in a sustainable way, 3D solar evaporator has been proposed this paper by repurposing recycled from MSW form egg trays dry toner (e-waste) using facile fabrication method. The unique porous structure, fibrous surface, superior absorbing capability low thermal conductivity wastepaper-derived make...

10.1021/acsami.1c22215 article EN ACS Applied Materials & Interfaces 2022-02-04

The progression of photothermal materials with broad solar absorption and improved conversion efficiency is critical for developing interfacial steam generation (ISSG)‐based water desalination purification systems. This green solar‐driven vaporization technology has regained popularity as a sustainable solution to shortage. Among many other materials, natural porous material‐based evaporators have piqued the interest researchers owing their biodegradability, abundance, low thermal...

10.1002/solr.202100986 article EN Solar RRL 2022-01-22

The nonlinear optical (NLO) properties of two-dimensional (2D) materials are fascinating for fundamental physics and optoelectronic device development. However, relatively few investigations have been conducted to establish the combined NLO activities a 2D material. Herein, study numerous gallium sulfide (GaS), including second-harmonic generation (SHG), two-photon excited fluorescence (TPEF), absorption presented. layer-dependent SHG response GaS identifies noncentrosymmetric nature odd...

10.1021/acsnano.2c03566 article EN ACS Nano 2022-07-25

Abstract 2D semi‐metallic hafnium ditelluride material is used in several applications such as solar steam generation, gas sensing, and catalysis owing to its strong near‐infrared absorbance, high sensitivity, distinctive electronic structure. The zero‐bandgap characteristics, along with the thermal dynamic stability of 2D‐HfTe 2, make it a desirable choice for developing long‐wavelength‐range photonics devices. Herein, HfTe 2 ‐nanosheets are prepared using liquid‐phase exfoliation method,...

10.1002/smtd.202300239 article EN Small Methods 2023-06-25

Internet of Things (IoT) is an augmentation existing internet facility to deliver communication, connection and internetworking between various devices physical objects also known as "Things". Accessibility great speed makes it possible switch control numerous kinds very easily. This paper discussed a smart low-cost home automation system which designed using IoT. With the help this system, all appliances electronic machines can be controlled observed through website The metering method...

10.1109/icrest.2019.8644232 article EN 2019 International Conference on Robotics,Electrical and Signal Processing Techniques (ICREST) 2019-01-01

Abstract Tin telluride (SnTe) quantum dots (QDs) have attracted considerable interest in the optoelectronic field owing to their favorable properties over conventional QDs, such as a relatively large Bohr radius (95 nm) and low toxicity level. However, till date, nonlinear optical ultrafast photonics applications of SnTe QDs remained unexplored. In this study, with an average diameter 74 nm (smaller than SnTe) are fabricated via liquid‐phase exfoliation method. Consequently, saturable...

10.1002/adom.202001821 article EN Advanced Optical Materials 2020-12-23

Two-dimensional (2D) gallium sulfide (GaS) offers a plethora of exceptional electrical and optical properties, allowing it to be used in wide range applications, including photodetectors, hydrogen generation, nonlinear devices. In this paper, ultrathin 2D GaS nanosheets are synthesized using the liquid-phase exfoliation method, structure, morphology, chemical composition as-prepared extensively investigated. After depositing on side polished fibers, successful saturable absorbers (SAs)...

10.1021/acsami.1c18155 article EN ACS Applied Materials & Interfaces 2021-11-18

Two-dimensional (2D) transition metal dichalcogenide (TMD) materials have exceptional optoelectronic and structural properties, which allow them to be utilized in several significant applications energy, catalyst, high-performance devices. Among other the nonlinear optical properties are gaining much attention research field. In this work, a unique pentagonal TMD material, palladium disulfide (PdS2), is employed as saturable absorber (SA) an ytterbium-doped fiber (YDF) laser cavity...

10.3390/nano10122441 article EN cc-by Nanomaterials 2020-12-06

The front contact of solar cells greatly influences the optoelectronic performance perovskite (PSCs) by controlling coherent light propagation as well charge transport within device. Herein, nanophotonic consisting multilayer nanodomes and nanoholes for high‐efficiency single‐junction perovskite/perovskite tandem (PVK/PVK TSCs) is investigated. optical electrical characteristics are investigated conducting an advanced 3D numerical approach with combination finite‐difference time‐domain...

10.1002/solr.202100509 article EN Solar RRL 2021-09-01

Abstract Van der Waals (vdW) heterojunctions represent a significant frontier in post‐Moore era optoelectronics, especially optimizing photosensor performance through multivariate approaches. Here synergistic engineering of GaS–WSe 2 all‐vdW photodiodes is investigated, which exhibit broadband detection (275–1064 nm), multispectral unity approaching linearity, alongside substantial linear dynamic range (LDR) 106.78 dB. Additionally, the achieve remarkable on/off ratio 10 5 and rapid response...

10.1002/smll.202410841 article EN cc-by-nc-nd Small 2025-03-24
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