A5009451040- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- Carbon Nanotubes in Composites
- Quantum Dots Synthesis And Properties
- Graphene research and applications
- Organic Light-Emitting Diodes Research
- Diamond and Carbon-based Materials Research
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- solar cell performance optimization
- Luminescence Properties of Advanced Materials
- Fiber-reinforced polymer composites
- Radiation Detection and Scintillator Technologies
- Semiconductor materials and interfaces
- Gas Sensing Nanomaterials and Sensors
- Semiconductor Quantum Structures and Devices
- Advanced X-ray and CT Imaging
- Electronic and Structural Properties of Oxides
- Photovoltaic Systems and Sustainability
- Photovoltaic System Optimization Techniques
- Analytical Chemistry and Sensors
- Magnetic and transport properties of perovskites and related materials
University of Surrey
2016-2025
Guildford Hospital
2017-2021
ZnO nanostructures with different morphologies (nanowires, nanodisks, and nanostars) were synthesized hydrothermally. Gas sensing properties of the as-grown investigated under thermal UV activation. The performance nanodisk gas sensor was found to be superior that other (Sg ∼ 3700% 300 ppm ethanol response time recovery 8 13 s). enhancement in sensitivity is attributed surface polarities structures on nanoscale. Furthermore, selectivity sensors can achieved by controlling intensity used...
A generic electromagnetic model for the working principles of triboelectric nanogenerators derived using Maxwell's equations, to a universally applicable framework.
Abstract X-ray detectors are critical to healthcare diagnostics, cancer therapy and homeland security, with many potential uses limited by system cost and/or detector dimensions. Current sensitivities the bulk attenuation of materials consequently necessitate thick crystals (~1 mm–1 cm), resulting in rigid structures, high operational voltages cost. Here we present a disruptive, flexible, low cost, broadband, sensitivity direct transduction technology produced embedding atomic number bismuth...
Recent developments in solution processable single junction polymer solar cells have led to a significant improvement power conversion efficiencies from ∼5% beyond 9%. While much of the initial efficiency improvements were driven through judicious design donor polymers, it is engineering device architectures incorporation inorganic nanostructures and better processing that has continued gains. Inorganic nano-components such as carbon nanotubes, graphene its derivatives, metal nanoparticles...
Transparent, highly percolated networks of regioregular poly(3-hexylthiophene) (rr-P3HT)-wrapped semiconducting single-walled carbon nanotubes (s-SWNTs) are deposited, and the charge transfer processes these nanohybrids studied using spectroscopic electrical measurements. The data disclose hole doping s-SWNTs by polymer, challenging prevalent electron-doping hypothesis. Through controlled fabrication, high- to low-density nanohybrid achieved, with hybrid nanotube tested as transport layers...
Abstract Carbon fibre reinforced polymers (CFRP) were introduced to the aerospace, automobile and civil engineering industries for their high strength low weight. A key feature of CFRP is polymer sizing - a coating applied surface carbon fibres assist handling, improve interfacial adhesion between matrix allow this wet-out fibres. In paper, we introduce an alternative material sizing, namely nanotubes (CNTs) on fibres, which in addition imparts electrical thermal functionality. High quality...
Abstract Over the last decade, 2,2″,7,7″‐Tetrakis[ N , ‐di(4‐methoxyphenyl)amino]‐9,9′‐spirobifluorene (spiro‐OMeTAD) has remained hole transporting layer (HTL) of choice for producing high efficiency perovskite solar cells (PSCs). However, PSCs incorporating spiro‐OMeTAD suffer significantly from dopant induced instability and non‐ideal band alignments. Herein, a new approach is presented tackling these issues using functionality organometallocenes to bind Li + ions, rendering them immobile...
Abstract Successful manipulation of halide perovskite surfaces is typically achieved via the interactions between modulators and perovskites. Herein, it demonstrated that a strong‐interaction surface modulator beneficial to reduce interfacial recombination losses in inverted (p‐i‐n) solar cells (IPSCs). Two organic ammonium salts are investigated, consisting 4‐hydroxyphenethylammonium iodide 2‐thiopheneethylammonium (2‐TEAI). Without thermal annealing, these two can recover photoluminescence...
Perovskite/silicon tandem solar cells have been intensively studied in recent years, and their efficiencies rapidly increased owing to the numerous efforts this field. A question about which type of silicon cell is most suitable subcell devices emerges. Herein, three attractive are summarized, including passivated-emitter rear-cell (PERC), tunnel oxide passivated contact (TOPCon), heterojunction (HJT) cells. Their structures features elucidated for a clear understanding mechanism potential...
The development of perovskite solar cells (PSCs) with low recombination losses at processing temperatures is an area growing research interest as it enables compatibility roll‐to‐roll on flexible substrates well tandem cells. inverted or p–i–n device architecture has emerged the most promising PSC configuration due to possibility using low‐temperature processable organic hole‐transport layers and more recently, self‐assembled monolayers such [4‐(3,6‐dimethyl‐9 H...
Abstract Photovoltaics (PVs) are a critical technology for curbing growing levels of anthropogenic greenhouse gas emissions, and meeting increases in future demand low-carbon electricity. In order to fulfill ambitions net-zero carbon dioxide equivalent (CO 2 eq) emissions worldwide, the global cumulative capacity solar PVs must increase by an magnitude from 0.9 TW p 2021 8.5 2050 according International Renewable Energy Agency, which is considered be highly conservative estimate. 2020, Henry...
Solution processed core–shell nano-structures of metal oxide-reduced graphene oxide (RGO) are used as improved electron transport layers (ETL), leading to an enhancement in photocurrent charge PCDTBT:PC70BM for both single cell and module photovoltaic devices. As a result, the power conversion efficiency devices with RGO-metal oxides ETL increases 8% cells 20%
Photoluminescence quenching is observed in acid functionalized multiwall carbon nanotubes incorporated polymer: fullerene films, suggesting efficient charge transfer, believed to be due acting as exciton dissociation centres. The fabricated photovoltaic devices with triple heterojunction interfaces show increased short circuit current density compared the device without nanotubes.
We report new solution processable electron transport layers for organic photovoltaic devices based on composites of metal oxides and reduced graphene oxides. Low bandgap polymer cells fabricated using these nanohybrid display power conversion efficiencies in the range 7.4–7.5% which is observed to be an improvement over conventional oxide or thermally evaporated layers. This efficiency enhancement driven mainly by improvements short circuit current (from ∼14.8 ∼15.0 mA cm−2) as well fill...
Abstract Metal–organic frameworks (MOFs) have emerged as an exciting class of porous materials that can be structurally designed by choosing particular components according to desired applications. Despite the wide interest in and many potential applications MOFs, such gas storage, catalysis, sensing drug delivery, electrical semiconductivity its control is still rare. The use fabrication electronic devices with MOF-based has not been widely explored, despite significant progress these made...
Interface-mediated recombination losses between perovskite and charge transport layers are one of the main reasons that limit device performance, in particular for open-circuit voltage (VOC) solar cells (PSCs). Here, functional molecular interface engineering (FMIE) is employed to retard interfacial losses. The FMIE a facile solution-processed means introducing molecules, fluorene-based conjugated polyelectrolyte (CPE) organic halide salt (OHS) on both contacts absorber layer. Through FMIE,...
Graphene oxide (GO) is becoming increasingly popular for organic electronic applications. We present large active area (0.64 cm2), solution processable, poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]:[6,6]-Phenyl C71 butyric acid methyl ester (PCDTBT:PC70BM) photovoltaic (OPV) solar cells, incorporating GO hole transport layers (HTL). The power conversion efficiency (PCE) of ∼5% the highest reported OPV using this...
Alumina nanoparticles enhance perovskite surface electronic homogeneity, bulk electrical conduction, and device stability when used as a modifier on hydrophobic self-assembled monolayers, outperforming widely polyelectrolytes.
Electronic skins (e-skins), which can seamlessly adapt and adhere to the body mimic functionality of human skin, are a rapidly emerging research area. Such e-skins have potential revolutionize artificial prosthetics, robotics, human-machine interfacing, health monitoring applications. Powering e-skin is critical challenge at present due strict performance criteria, including flexibility, stretchability, mobility, autonomous operation. One most promising approaches overcome some these...
We report the need for careful selection of anti-solvents Sn-based perovskite solar cells fabricated through commonly used anti-solvent method, compared to their Pb-based counterparts.
A new post-treatment method for lead–tin mixed perovskites enabling device fill factors approaching 83%.