A5023795251- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Advancements in Battery Materials
- Smart Grid Energy Management
- Integrated Energy Systems Optimization
- Advanced Battery Technologies Research
- Low-power high-performance VLSI design
- Semiconductor materials and devices
- Thin-Film Transistor Technologies
- Optical Network Technologies
- ICT in Developing Communities
- Chalcogenide Semiconductor Thin Films
- Advanced Battery Materials and Technologies
- Video Surveillance and Tracking Methods
- Advancements in Solid Oxide Fuel Cells
- Building Energy and Comfort Optimization
- Energy and Environment Impacts
- Semiconductor Lasers and Optical Devices
- Species Distribution and Climate Change
- Remote-Sensing Image Classification
- Facilities and Workplace Management
- Sustainable Building Design and Assessment
- Advanced Optical Network Technologies
- Photochemistry and Electron Transfer Studies
The Faraday Institution
2023-2024
University of Oxford
2019-2024
Science Oxford
2020-2022
Imperial College London
2015-2018
Plastic Electronics (Netherlands)
2017
Transnational Press London
2016-2017
Here, we demonstrate that light and oxygen-induced degradation is the main reason for low operational stability of methylammonium lead triiodide (MeNH3PbI3) perovskite solar cells exposed to ambient conditions. When both dry air, unencapsulated MeNH3PbI3 rapidly degrade on timescales minutes a few hours. This rapid also observed under electrically bias driven current flow in dark presence O2. In contrast, significantly slower when devices are moisture alone (e.g. 85% relative humidity N2)....
Non-fullerene acceptors with optimized energy levels enable 10% efficient solar cells reduced voltage losses <0.6 V.
In this paper we address the JV hysteresis behavior of planar organic–inorganic lead halide perovskite solar cells fabricated using PC60BM as cathode. At room temperature, these devices exhibit apparently free scans. We observe that cooling temperature to 175 K results in appearance substantial hysteresis. Employing chronoamperometric measurements, demonstrate half-time for relaxation process underlying slows from 0.6 s at 298 15.5 K, yielding an activation energy 0.12 eV. further by a cell...
Abstract Nonfullerene acceptors (NFAs) in blends with highly crystalline donor polymers have been shown to yield particularly high device voltage outputs, but typically more modest quantum yields for photocurrent generation as well often lower fill factors (FF). In this study, we employ transient optical and optoelectronic analysis elucidate the determining FF of polymer PffBT4T‐2OD promising NFA FBR or widely studied fullerene acceptor PC 71 BM. Geminate recombination losses, measured by...
Organic solar cells have many merits, including low cost and the ability to cover large flexible substrates, yet there is much room improve them. To maximize their efficiency, this study investigates effects of surface recombination in a model system, which work function electrode contacts varied via oxygen-plasma treatment. The authors explain how changing properties contact has profound effect not only on device but also interpretation optoelectronic measurements these devices.
The microstructure and electrochemical performance of solvent-free processed slurry cast Li(Ni 0.6 Co 0.2 Mn )O 2 (NMC622) based electrodes for Li-ion batteries has been investigated. In contrast to a moss-like PVDF-based carbon binder domain in electrodes, the PTFE had hierarchical morphology composed primary fibrils few µm diameter 100’s length that branched into secondary then ever finer fibrils, down diameters 10s nm or below. A mechanism formation branch-like observed PTFE-based is also...
Electron spin is a key consideration for the function of organic semiconductors in light-emitting diodes and solar cells, as well spintronic applications relying on magnetoresistance. A mechanism triplet excited state generation such systems by recombination electron-hole pairs. However, exact charge mechanism, whether geminate or nongeminate it involves spin-state mixing not understood. In this work, dynamics free separation competing with to polymer states studied two closely related...
Transient optoelectronic measurements were used to evaluate the factors determining open-circuit voltage of a series planar photovoltaic devices based on hybrid perovskite layers with varying iodine/bromine ratios. Employing differential charging and transient photovoltage measurements, we simple device model charge-carrier-density dependence nongeminate recombination re-create correctly not only measured (VOC) as function light intensity but also its bromine substitution. The 173 (±7) mV...
Degradation analysis of CH<sub>3</sub>NH<sub>3</sub>Pb(I<sub>1−x</sub>Br<sub>x</sub>)<sub>3</sub> mixed halide perovskites, showing promising environmental stability CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub>.
Heating decarbonisation through electrification is a difficult challenge due to the considerable increase in peak power demand. This research proposes novel modelling approach that utilises easily accessible national-level data identify required heat storage volume buildings decrease demand and maximises carbon reductions associated with electrified heating technologies smart demand-side response. The assesses optimal shifting of pump operation meet thermal according different capacities...
Correction for ‘Light and oxygen induced degradation limits the operational stability of methylammonium lead triiodide perovskite solar cells’ by Daniel Bryant <italic>et al.</italic>, <italic>Energy Environ. Sci.</italic>, 2016, DOI: 10.1039/c6ee00409a.
A key challenge in achieving control over photocurrent generation by bulk-heterojunction organic solar cells is understanding how the morphology of active layer impacts charge separation and particular dynamics within molecularly intermixed donor–acceptor domains versus between phase-segregated domains. This paper addresses this issue studying blends devices amorphous silicon–indacenodithiophene polymer SiIDT-DTBT acceptor PC70BM. By changing blend composition, we modulate size density pure...
To implement effective rural electricity access systems, it is fundamental to identify where potential consumers live. Here, we test the suitability of citizen science paired with satellite imagery and computer vision map remote off-grid homes for electrical system design. A project called "Power People" was completed on Zooniverse platform collect home annotations in Uganda, Kenya, Sierra Leone. Thousands scientists created a novel dataset 578,010 an average mapping speed 7 km2/day. These...
Many building standards are available worldwide to support sustainable design. However, most of them only define compliance before occupancy, overlooking the real usage and its implications for meeting zero-carbon targets. This research proposes a systematic post-occupancy evaluation intervention (POEI) protocol analyse performance cost-effective upgrading. The novelty lies in integrating novel diagnostic data science techniques identify gaps, advanced physics-driven energy modelling...
<title>Abstract</title> Bilayer cathodes comprising two active materials are explored for their ability to improve lithium-ion battery charging performance. Electrodes manufactured with various arrangements of lithium nickel manganese cobalt oxide Li[Ni<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>]O<sub>2</sub> (NMC622) and iron phosphate LiFePO<sub>4</sub> (LFP) particles, including in different discrete sub-layers. We present experimental data on the sensitivity electrode C rate...
A core tenet of citizen science is mutual benefit to the professional researcher and scientist. While impacts on scientist are often implicitly assumed be positive, this infrequently studied directly. Here, we evaluate Power People remote mapping project volunteers explore best practices for positive impact. We analyze beta feedback collected before launch, discussion board posts made during project, an end-of-project evaluation survey, data generated project. found that attracted a diverse...
A record aggregate capacity transmission of 3.2 Tb/s (80 × 40 Gb/s) audio, video and data traffic in a single fiber over 3 spans SSMF was demonstrated field trial using FEC Raman amplification TDC.
This paper presents the service value method (SVM) as a novel means to gather and interpret end-user needs, aspirations, contextual factors improve engineering design practice of energy access systems for Global South. The adopts service-oriented approach consists rapid effective field exercise qualitative quantitative data from end users in focus groups. is suitable enabling participation South contexts. are interpreted maps that capture preferences inform tradeoffs different criteria,...
Solar cells based on blends of the donor polymer, P3HT, with nonfullerene acceptor, O-IDTBR, have been shown to exhibit promising efficiencies and stabilities for low-cost organic photovoltaic devices. We focus herein charge separation recombination dynamics in such By employing selective wavelength excitations P3HT we show that photoexcitation results lower internal quantum efficiency (IQE) photocurrent generation than observed O-IDTBR. Transient absorption photoluminescence quenching...
<title>Abstract</title> Bilayer cathodes comprising two active materials are explored for their ability to improve lithium-ion battery charging performance. Electrodes manufactured with various arrangements of lithium nickel manganese cobalt oxide Li[Ni<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>]O<sub>2</sub> (NMC622) and iron phosphate LiFePO<sub>4</sub> (LFP) particles, including in different discrete sub-layers. We present experimental data on the sensitivity electrode C rate...
<title>Abstract</title> Bilayer cathodes comprising two active materials are explored for their ability to improve lithium-ion battery charging performance. Electrodes manufactured with various arrangements of lithium nickel manganese cobalt oxide Li[Ni<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>]O<sub>2</sub> (NMC622) and iron phosphate LiFePO<sub>4</sub> (LFP) particles, including in different discrete sub-layers. We present experimental data on the sensitivity electrode C rate...
<title>Abstract</title> Bilayer cathodes comprising two active materials are explored for their ability to improve lithium-ion battery charging performance. Electrodes manufactured with various arrangements of lithium nickel manganese cobalt oxide Li[Ni<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>]O<sub>2</sub> (NMC622) and iron phosphate LiFePO<sub>4</sub> (LFP) particles, including in different discrete sub-layers. We present experimental data on the sensitivity electrode C rate...
<title>Abstract</title> Bilayer cathodes comprising two active materials are explored for their ability to improve lithium-ion battery charging performance. Electrodes manufactured with various arrangements of lithium nickel manganese cobalt oxide Li[Ni<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>]O<sub>2</sub> (NMC622) and iron phosphate LiFePO<sub>4</sub> (LFP) particles, including in different discrete sub-layers. We present experimental data on the sensitivity electrode C rate...