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17 results for “heterojunction”
Potential of the three-terminal heterojunction bipolar transistor solar cell for space applications
<p>In this video we repeat the presentation we gave at the European Space Power Conference (2019), in JeanLes Pins, describing the potential of the three-terminal heterojunction bipolar transistor solar cell for space applications. There is a paper published in the proceedings of the Conference were you can find more details.</p>
Limiting Efficiency of Heterojunction Solar Cells
<p>In this video we summarize the results of the work titled "Limiting Efficiency of Heterojunction Solar Cells" we published in IEEE Journal of Photovoltaics with DOI: <a href="https://doi.org/10.1109/JPHOTOV.2019.2932626">https://doi.org/10.1109/JPHOTOV.2019.2932626</a>. </p>
Nanobeam 4D-STEM raw data of monolayer WS2-WSe2 lateral heterojunctions
<p>The sample under investigation comprises a monolayer WS2-WSe2 lateral heterojunction featuring in-plane epitaxial interfaces. The datasets were acquired using an electron microscope pixel array detector (EMPAD) at Cornell University in 2016, with the following specifications: Magnification: 27.5 kx, Convergence angle: 1.2 mrad, C2 aperture size: 70, Spot size: 9. This dataset is from the same batch of datasets referenced in the paper by Han et al., Nano Letters 18, 3746-3751 (2018). Additionally, data from the same batch are also cited in the publication by Shi et al., npj Computational Materials 8, 114 (2022). Further details regarding the materials synthesis can be found in the paper by Xie et al., Science 359, 1131-1136 (2018). </p>
Nonlinear self calibrated spectrometer with single GeSe-InSe heterojunction device
<p>Computational spectrometry is an emerging field that employs photodetection in conjunction with numerical algorithms for spectroscopic measurements. Compact single photodetectors made from layered materials are particularly attractive since they eliminate the need for bulky mechanical and optical components used in traditional spectrometers and can easily be engineered as heterostructures to optimize device performance. However, such photodetectors are typically nonlinear devices, which adds complexity to extracting optical spectra from their response. Here, we train an artificial neural network (ANN) to recover the full nonlinear spectral photoresponse of a single GeSe-InSe p-n heterojunction device. The device has a spectral range of 400-1100 nm, a small footprint of ~25×25 〖μm〗^2, and a mean reconstruction error of 〖2×10〗^(-4) for the power spectrum at 0.35 nm. Using our device, we demonstrate a solution to metamerism, an apparent matching of colors with different power spectral distributions, which is a fundamental problem in optical imaging.</p>
Photoelectrochemical performance of BiOI/TiO2 Nanotube Arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods
<p class="MsoNormal"><span>In order to extend the visible region activity of titania nanotube array (TNAs) films, the Successive Ionic Layer Adsorption and Reaction (SILAR)-ultrasonication-assisted method has been used to prepare BiOI-modified TiO<sub>2</sub> nanotube arrays (BiOI/TNAs). The band gap of BiOI/TNAs for all the variations reveals absorption in the visible absorption. The surface morphology of BiOI/TNAs is shown in the nanoplate, nanoflake, and nanosheet forms with a vertical orientation perpendicular to TiO<sub>2</sub>. The crystalline structure of BiOI did not change the structure of the anatase TNAs, with the band gap energy of the BiOI/TNAs semiconductor in the visible region. The photocurrent density of the BiOI/TNAs extends to the visible-light range. BiOI/TNAs with 1 mM Bi and 1 mM KI on TNAs 40 V 1 h 50 V 30 min shows the optimum photocurrent density. A tandem dye-sensitized solar cell (DSSC)-photoelectrochemical (PEC) was used for hydrogen production in salty water. BiOI/TNAs optimum was used as the photoanode of the PEC cell. Solar to hydrogen conversion efficiency (STH) of tandem DSSC-PEC reaches 1.34% in salty water.</span></p>
Photoelectrochemical performance of BiOI/TiO2 Nanotube Arrays (TNAs) p-n heterojunction synthesized by SILAR-ultrasonication-assisted methods
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Nonlinear self calibrated spectrometer with single GeSe-InSe heterojunction device
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Data from: The fabrication of the heterojunction catalyst BiVO4/P25 and its visible-light photocatalytic activities
A heterojunction catalyst BiVO4/P25 was successfully fabricated using a one-step hydrothermal method. The BiVO4/P25 samples exhibited better photocatalytic activities and absorption performances when compared with the pure BiVO4. The degradation rate of the methyl blue (MB) solution (5 mg/L) reached up to 85% in sixty minutes under visible-light illumination (λ > 420 nm). The nanocomposites were characterized using XPS, Raman spectroscopy, FT-IR, UV–visual diffuse reflectance spectroscopy, SEM and HR-TEM. A high-powered scanning electron microscope showed a polyhedron shape and a flower-like shape. The BiVO4/P25 nanocomposite was found to have a rougher surface, as well as a larger surface area, when compared with the pure BiVO4. This resulted in an improved photocatalytic activity, along with super absorption to a large extent.
Sliding trajectories of strained Graphullerene/graphene and Graphullerene/h-BN heterojunction
<p>This dataset contains the sliding trajectories of strained GF/graphene and GF/<em>h</em>-BN along three directions (including total energy and atomic coordinates in extend xyz format) described in the manuscript "Superlubric Graphullerene" (to be submitted). </p>
Data from: The fabrication of the heterojunction catalyst BiVO4/P25 and its visible-light photocatalytic activities
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Two-dimensional arsenene/HfNBr van der Waals Heterojunction as water splitting photocatalyst: first-principles predictions
<p>Please see ref:</p> <p> </p> <p>(under review)</p>
Dataset for Mechanistic insights into photo-current enhancement in photo-active SrTiO3 heterojunctions under UV illumination
<p>Raw data inlcude time series of current and voltage of SrTiO3 solar cells with and without illumination as well as impedance spectra with and with illumination, under open circuit conditions and under load.</p> <p>SC1-SC4 are measured in ambient air, SC7-SC9 in snythetic O2/N2 mixture.</p>
Dataset for Silicon Heterojunction Solar Cells: Excellent Candidate for Low Light Illuminations
<p>The current solar cells and modules are marketed according to the behaviour at standard test conditions (STC), however, these devices are more often operated at lower irradiance levels. The dependence on illumination stems mainly from the voltage at the open circuit and at the maximum power point. The latter might also be strongly influenced by serial resistance, but that is more an engineering problem not addressed here. More fundamentally, the voltage is determined by quasi-Fermi levels at the contacts. In the case of unconstrained conductivity between the absorber and electrode, the quasi-Fermi levels are flat, and determined by their splitting in the absorber. Our analysis shows that the modulation doping mechanism working in Si heterojunction solar cell between the doped amorphous Si layer with a higher bandgap and crystalline absorber with a lower bandgap can, for certain parameter settings, lead to strongly depleted contact layer that limits conduction. This is a prerequisite for decoupling the quasi-Fermi level between contact and absorber and offers the possibility for additional voltage increase. Based on this understanding, we simulate a heterojunction solar cell with a varying thickness and doping of amorphous silicon p-type contact. We demonstrate that for a certain combination of thinner or lower-doped contact, higher efficiency at low illumination can be achieved compared to the technological baseline. This is fully in line with the experimental findings. This analysis is crucial not only for using solar cells for indoor applications but also for designing photovoltaic modules optimized for low irradiance, potentially increasing the level of self-sufficiency of buildings. </p>
Data from: Enhancing the efficiency of planar heterojunction perovskite solar cells via interfacial engineering with 3-aminopropyl trimethoxy silane hydrolysate
The interfacial compatibility between compact TiO2 and perovskite layers is critical for the performance of planar heterojunction perovskite solar cells (PSCs). A compact TiO2 film employed as an electron-transport layer (ETL) was modified using 3-aminopropyl trimethoxy silane (APMS) hydrolysate. The power conversion efficiency (PCE) of PSCs composed of an APMS-hydrolysate-modified TiO2 layer increased from 13.45 to 15.79%, which was associated with a significant enhancement in the fill factor (FF) from 62.23 to 68.04%. The results indicate that APMS hydrolysate can enhance the wettability of γ-butyrolactone (GBL) on the TiO2 surface, form a perfect CH3NH3PbI3 film, and increase the recombination resistance at the interface. This work demonstrates a simple but efficient method to improve the TiO2/perovskite interface that can be greatly beneficial for developing high-performance PSCs.
Data from: Enhancing the efficiency of planar heterojunction perovskite solar cells via interfacial engineering with 3-aminopropyl trimethoxy silane hydrolysate
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Nano-flower-stick S-scheme Au/MoS2/Bi2S3 heterojunction with multiple enzyme-like activity for efficient tumor photothermal and photodynamic combination therapy
GEO Series GSE299337. Mus musculus. 6 samples. Type: Expression profiling by high throughput sequencing.
Temperature Dependent External Quantum Efficiency, Electroluminescence and Open-Circuit Voltage of Organic Small Molecule-Fullerene Bulk Heterojunction Solar Cells
<p>temperature dependent spectroscopy data of small-molecule donor:fullerene acceptor solar cells</p> <p>* photovoltaic external quantum efficiency</p> <p>* electroluminescence emission</p> <p>* open-circuit voltage</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.