A5085116269- Transition Metal Oxide Nanomaterials
- Thin-Film Transistor Technologies
- Silicon and Solar Cell Technologies
- Photochromic and Fluorescence Chemistry
- Ferroelectric and Piezoelectric Materials
- Chalcogenide Semiconductor Thin Films
- Silicon Nanostructures and Photoluminescence
- Advanced Photocatalysis Techniques
- Semiconductor materials and interfaces
- solar cell performance optimization
- Electronic and Structural Properties of Oxides
- Acoustic Wave Resonator Technologies
- Solar Thermal and Photovoltaic Systems
- Hydrogen Storage and Materials
- ZnO doping and properties
- Advanced Memory and Neural Computing
- Catalysis and Oxidation Reactions
- Conducting polymers and applications
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Sensor and Energy Harvesting Materials
- Photonic Crystals and Applications
- Semiconductor materials and devices
- Gas Sensing Nanomaterials and Sensors
- Photonic and Optical Devices
- Nonlinear Optical Materials Studies
Institute for Energy Technology
2013-2023
Norwegian University of Science and Technology
2007-2010
Thin films of oxygen-containing yttrium hydride show photochromic effect at room temperature. In this work, we have studied structural and optical properties the deposited different deposition pressures, discovering possibility engineering band gap by variation oxygen content. sum, transparency wavelength range photons triggering can be controlled pressure.
It has been recently demonstrated that yttrium oxyhydride (YHO) films can exhibit reversible photochromic properties when exposed to illumination at ambient conditions. This switchable optical property enables their utilization in many technological applications, such as smart windows, sensors, goggles, and medical devices. However, how the composition of affects is not fully clear therefore demands an investigation. In this paper, YHO manufactured by reactive magnetron sputtering under...
The presented work is focusing on optical interference coatings the back side of front glass for crystalline silicon-based photovoltaic modules. We present results how such can be designed to obtain desired visual properties combined with a limited loss in power conversion efficiency. This colouring technology may therefore very attractive building integrated photovoltaics. Coating design parameters as number layers, wavelength, layer thicknesses, and refractive indices affect both...
We report results from a national project about impurities in high performance multicrystalline silicon: Contamination sources, transport routes, interaction with crystal defects and impact on solar cell efficiency parameters. Several ingots were produced lab scale furnace. Growth parameters crucible types varied, purity quartz crucibles compared to novel silicon nitride crucibles. The material was characterized by range of methods including FTIR, GDMS, NAA, EBSD, dislocation etching,...
In this work we demonstrate by transmission electron microscopy and piezoresponse force spectroscopy that the polarization direction in hydrothermally synthesized lead titanate (PbTiO3) nanorods can be changed from parallel to nanorod axis perpendicular it a simple heat treatment above Curie temperature. The also introduced 90° domains, caused rearrangement of surface reduction amounts defects. heat-treated could successively switched axis. This control PbTiO3 opens up possibilities...
In this paper, we present a study of silicon surface passivation based on the use spin-coated hybrid composite layers. We investigate both undoped poly(3,4-ethylenedioxythiophene)/poly-(styrenesulfonate) (PEDOT:PSS), as well PEDOT:PSS functionalized with semiconducting oxide nanomaterials (TiO2 and SnO2). The compound was deposited at room temperature by spin coating-a potentially lower cost, processing time higher throughput alternative compared commonly used vacuum-based techniques....
Wafers from a hybrid silicon ingot seeded in part for High Performance Multicrystalline, quasi‐mono structure, are studied terms of the effect gettering and hydrogenation on their final Internal Quantum Efficiency. The wafers thermally processed different groups – gettered hydrogenated. Afterwards, low temperature heterojunction with intrinsic thin layer cell process is applied to minimize impact temperature. Such procedure made it possible study processing steps dislocation clusters...
Transparent yttrium oxyhydride (YHO) thin films exhibit photochromic effects under ambient conditions. The optical transmission in such materials can be strongly modulated upon light absorption. This switchable property is interesting for technological applications, as energy-saving smart windows and sensors. For the practical use of YHO materials, it crucial to understand how kinetics coloration resulting contrast are influenced different illumination conditions at both room elevated...
The thermal stability of hydrogenated amorphous silicon‐passivated monocrystalline silicon wafers is investigated at different annealing times and temperatures. Stepwise was performed temperatures ranging from 100 to 500 °C for 1, 5 15 min, respectively, the effective minority carrier lifetime measured after each step using density imaging. Annealing lower up 250 results in a significant improvement compared with that as‐deposited samples, increasing maximum value ∼1.5 ms sample 200 min. 350...
It has been recently demonstrated that yttrium oxyhydride(YHO) films can exhibit reversible photochromic properties when exposed to illumination at ambient conditions. This switchable optical propertyenables their utilization in many technological applications, such as smart windows, sensors, goggles, medical devices, etc. However, how the composition of affects is not fully clear and therefore demands a straightforward investigation. In this work, YHO manufactured by reactive magnetron...
In this paper we have used a sequential measurement routine to separate and evaluate the effects of two dominant mechanisms for degradation carrier lifetime silicon wafers: Boron-oxygen related light induced (BO-LID) elevated temperature (LeTID). Wafers from different heights in high performance multicrystalline brick first been illuminated at room fully activate BO-LID process wafers, followed by an annealing more detrimental recombination sites causing LeTID. By isolating LeTID way hope...
Neutron and X-ray reflectometry were used to determine the layer structure hydrogen content of thin films amorphous silicon (a-Si:H) deposited onto crystalline (Si) wafers for surface passivation in solar cells. The combination these two techniques is well suited non-destructive probing a-Si:H due being able probe buried interfaces having sub-nanometer resolution. also unique its ability allow determination density gradients light elements such as (H). neutron scattering contrast between Si...
Hole-conducting poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is a material receiving increasing interest for use in photovoltaic devices. In this work, we present the results of study degradation optical and electrical properties pure PEDOT:PSS doped with Si-nanoparticles. The has been deposited on top Si wafers by spin coating. We found that incorporation nanoparticles into enhances surface passivation wafer carrier lifetime measured photoluminesence quasi-steady state...