Waseem Ahmad

ORCID: 0000-0002-9670-7830
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About
Contact & Profiles
Research Areas
  • Perovskite Materials and Applications
  • Conducting polymers and applications
  • Quantum Dots Synthesis And Properties
  • Silicon Nanostructures and Photoluminescence
  • Laser Material Processing Techniques
  • Thin-Film Transistor Technologies
  • Ga2O3 and related materials
  • Laser-induced spectroscopy and plasma
  • Advanced battery technologies research
  • Coral and Marine Ecosystems Studies
  • Solid-state spectroscopy and crystallography
  • Chalcogenide Semiconductor Thin Films
  • Nanowire Synthesis and Applications
  • Organic Light-Emitting Diodes Research

University of Education
2021-2023

University of Okara
2021

National Engineering Research Center of Electromagnetic Radiation Control Materials
2018-2019

University of Electronic Science and Technology of China
2016-2019

Abstract Photodetectors, which can convert light signals into electrical signals, are important opto‐electronic devices in imaging, optical communication, biomedical/biological sensing, and so on. Here a solution‐processed photodetector based on the triple cation perovskite is demonstrated. The photodetectors show high detectivity, speed, as well excellent environmental stability. Operating at low voltage bias of 2 V, exhibit large on/off ratio 10 5 , specific detectivity ≈10 13 Jones, fast...

10.1002/adom.201701341 article EN Advanced Optical Materials 2018-04-19

Impurity-mediated near-infrared (NIR) photoresponse in silicon is of great interest for photovoltaics and photodetectors. In this paper, we have fabricated a series n+/p photodetectors with hyperdoped prepared by ion-implantation femtosecond pulsed laser. These devices showed remarkable enhancement on absorption at NIR wavelengths. The device implantation dose 1014 ions/cm2 has exhibited the best performance. proposed method offers an approach to fabricate low-cost broadband silicon-based

10.1186/s11671-017-2287-2 article EN cc-by Nanoscale Research Letters 2017-09-04

Although SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> is widely used in perovskite solar cells (PSCs) as the electron transport layer, there still a need for detailed investigation regarding impact of physisorption on performance PSCs. Here, we report role oxygen species from ambient atmosphere oxidation states and defective oxides at surface nanoparticles The nanoparticle's thin film shows higher state (Sn-O) lower charge trap...

10.1109/jphotov.2018.2877002 article EN IEEE Journal of Photovoltaics 2018-12-07

Hybrid lead halide perovskite solar cells (PSCs) are amongst those efficient cell technologies which developing rapidly. The rapid advancement in PSCs technology is because of favorable properties materials and addition charge selective layers. Here, we report lithium-doped SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> electron transport layer (ETL) to improve electrons extraction from the absorbing layer. not only shows relatively...

10.1109/jphotov.2019.2924734 article EN IEEE Journal of Photovoltaics 2019-07-18

Formamidinium iodide (FAI) based perovskite solar cells (PSCs) have now been established as effective PSCs than methylammonium lead for several years due to their optimal bandgap and high thermal stability. However, the FAI-based humidity issues, which mixed cation perovskites are getting popular. MAI-based better stability against but low stabilities. Herein, we prepared highly crystallized, efficient, large-grain size films via FAI post-dripping process. In addition, most promising...

10.1002/er.7496 article EN International Journal of Energy Research 2021-11-25

Several strategies and approaches have been reported for improving the resilience optoelectronic properties of perovskite films. However, fabricating a desirable stable absorber layer is still great challenge due to fabrication limitations materials. Here, we introduce diethylammonium bromide (DABr) as post-treatment material pre-deposited methylammonium lead iodide (MAPbI3) film fabricate high-quality two-dimensional/three-dimensional (2D/3D) stacked hetero-structure film. The method DABr...

10.3390/molecules28041592 article EN cc-by Molecules 2023-02-07

In this paper, we investigate the dependence of NIR absorption hyper‐doped silicon on different sulfur and nitrogen doping ratio. With molecular proportion N 2 SF 6 background gas, femtosecond laser irradiation was used to implant co‐doping into silicon. The presents high properties in visible range. results first‐principles calculations demonstrate is ascribed induced impurity energy levels process improves crystallinity doped layer because repairs defects lattices. Given thermal stability...

10.1002/pssa.201600524 article EN physica status solidi (a) 2016-10-26
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