The photovoltaic behaviors have been investigated considering structure and process parameters such as substrate thickness, dependence between graphene work function and transmittance, and n-type doping concentration in GaAs. Academia.edu is a platform for academics to share research papers. Koppens … In solar-assisted steam generators, simultaneously realizing high sunlight absorption and water transportation is a significant challenge. Efficient solar-thermal energy conversion is essential for the harvesting and transformation of abundant solar energy, leading to the exploration and design of efficient solar-thermal materials. Graphene monolayer sheet is integrated over silicon dioxide dielectric layer to improve the bandwidth and achieve maximum absorption in the visible region from 430 to 770 THz. Simulation results indicate that the average absorption of our graphene-based metasurface absorber is more than 84% in the visible range. The structures of the separate GQD, TPP, and their nanocomposites are optimized by hybrid DFT. graphene helps in achieving improved solar cell performance due to superior electrical conductivity. Low optical absorptivity of graphene limits the quantum efficiency of graphene-based optoelectronic devices. However, there are still some limitations on the current technologies achieved. absorptivity of unpolarized, visible and near-infrared light covering almost the entire solar spectrum (300-2500 nm). Even though it was already speculated that graphene holds potential for solar cells, it now turns out that it is even more suitable than expected.” Although there are some issues for direct applications, such as graphene’s low absorption, the new material holds the potential to cause radical changes in many technologies that are currently based on conventional semiconductors. Graphene transfer is a primary process for fabricating . Graphene oxide-based efficient and scalable solar desalination under one sun with a confined 2D water path Xiuqiang Li a,b, Weichao Xu , Mingyao Tang a,b, Lin Zhou , Bin Zhu , Shining Zhu , and Jia Zhua,b,1 aNational Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, School of Physics, Nanjing University, Nanjing 210093, The efficiency test of steam generation was performed under the solar intensity of 1000 Wm −2 for 1 h, and the photothermal conversion efficiency of reduced graphene oxide (RGO) and nitrogen-doped graphene (NRGO) was 73% and 87%, respectively. Graphene-based efficient metasurface solar absorber is presented. They created multi-rolled 3D graphene structures to overcome the limits of poor absorptivity of single-layer graphene. Optical absorption and short-circuit current density of the graphene cells showed, respectively, enhancements of 18 and 1.7 times when optimizations were done with respect to width and the grating period. This experimental work presents the photo thermal performance of water-based nano-fluids of graphene oxide (GO), zinc oxide (ZnO), copper oxide (CuO), and their hybrids under natural solar flux for the first time. A key process in getting electricity from light is the creation of excited electron-hole pairs of charge carriers on the absorption of light. Graphene & Solar Power for the Masses. The photovoltage was larger when the laser illumination was directly incident on the graphene side compared to the SU8 … This improvement in performance is associated with an increase … In addition, graphene has a low coefficient of light absorption 2.3% which indicates that is an almost completely transparent material. NRGO was combined with … Graphene-heterojunction solar cells are definitely the most extensively studied and used graphene-based solar cell. The analysis is conducted on the components of the proposed structure to understand the origin of wideband absorption. The all-layered-material Schottky barrier solar cell employing WS 2 as a photoactive semiconductor exhibits efficient photon absorption in the visible spectral range, yielding 3.3% photoelectric conversion efficiency with multilayer graphene as the Schottky contact. The proposed structure offers a wideband absorption response, where absorption of > 70% is gained for the frequency ranging from 537.91 to 635.73 THz. Linshuang Long, Xiaoyan Ying, Yue Yang, Liping Wang, Tuning the Infrared Absorption of SiC Metasurfaces by Electrically Gating Monolayer Graphene with Solid Polymer Electrolyte for Dynamic Radiative Thermal Management and Sensing Applications, ACS Applied Nano Materials, 10.1021/acsanm.9b00735, (2019). Furthermore, a graphene monolayer sheet is integrated to the proposed Although the optical absorption of the material is very high within the visible light range, however, its absorption for the infrared solar energy is relatively low. A multilayer structure is necessary given that a single graphene layer has a light absorption rate of only 2.3 percent. The SGM absorbers exhibit superior solar selective and omnidirectional absorption, flexible tunability of wavelength selective absorption, excellent photothermal performance, and high thermal stability. The role of 2D materials beyond graphene for solar-cell applications: Theoretically, a single TMDC monolayer with sub-nanometer thickness has the capability to absorb as much sunlight as 50 nm of Si or 15 nm gallium arsenide (GaAs) and, therefore, can generate electric currents as high as 4.5 mA cm-2. The metamaterial consists of alternating graphene and dielectric layers; a grating couples the light into waveguide modes to achieve broadband absorption over incident angles up to 60°. Monolith of ultrafine metal nanoparticles dispersed on porous graphene is directly fabricated via laser conversion of MOF crystals in air. The solar absorption coefficient of graphene nanofluid is enhanced 2.9 times by the core-shell nanoparticles. Per se, graphene heterojunction solar cells cannot be generalized … Three different types of GQDs - graphene oxide quantum dots (GOQDs), 5 h reduced GQDs, and 10 h reduced GQDs - were tested in BHJ solar cells, and the results indicate that GQDs play an important role in increasing optical absorptivity and charge carrier extraction of the BHJ solar cells. Therefore, the efficiency of conversion of solar energy with graphene+TiO 2 to electricity were increased from 1.45 % to 3.98 %, and the efficiency of conversion of solar energy with TiO 2 /graphene/TiO 2 sandwich structure to electricity was increased from 1.38 % to 3.93 %, respectively, under simulated full-sun illumination. This monolith exhibited high light absorptivity above 99% across the solar spectrum, ascribing to synergetic light absorption within cavities of dense metal nanoparticle arrays. The scientists then used a flat graphene-gold-SU8 photodetector and tested the substrate by illuminating each gold electrode with a 488 nm laser. applications. Graphene has also been intensively researched in the area of solar cells, primarily as an active material in light absorption or energy conversion and as a transparent or a distributed electrode material that would allow light to pass through but maintain the conductivity. There are a number of variations of heterojunction solar cells and how graphene derivatives can be added into them, including as photoactive layers, transparent electrode and GalliumArsenide (GaAs) solar cells. The solar absorption efficiency of water as a base-fluid can be significantly improved by suspending nanoparticles of various materials in it. Impressive solar-to-thermal conversion efficiency of 90.1% and solar-to-vapor efficiency of 96.2% have been achieved. Perovskite solar cells (PSCs) have made great strides over the last few years due to their interesting bandgap and absorption properties that produce high PCEs. We demonstrate a broadband enhancement of absorptivity in an architecture of graphene intercalation inside a simple-cubic woodpile photonic crystal. Developing graphene for flexible easy to manufacture and affordable photovoltaic applications Dr. Mae-Wan Ho. F. Graphene transfer. The very broad spectral and angular responses of the absorber are ideal for solar thermal applications, as we illustrate by showing heating to 160 °C in natural sunlight. scribed graphene can be used for solar steam generation with high scalability. Potential graphene applications include lightweight, thin, and flexible electric/photonics circuits, solar cells, and various medical, chemical and industrial processes enhanced or enabled by the use of new graphene materials.. An enhancement in thermal conductivity of 11.3% has been obtained at 20 °C for 0.3 g/L graphene-coated [email protected]@Ag nanofluids and 16% enhancement for the same volume fraction at 50 °C. In fact, it means that solar cells based on graphene can significantly expand the absorbed spectrum wavelengths of electromagnetic radiation. It was found that NRGO owned better solar absorption efficiency, lower thermal conductivity and porosity. Graphene could generate 10 pairs of charge carriers for each photon absorbed. The thermal conductivity results show that hybrid nanofluid showed high thermal conductivity than single nanofluids. Carbon-based materials, especially graphene, have the advantages of broadband absorption and excellent photothermal properties, and hold promise for solar-thermal energy conversion. The absorption of the nanocomposites consisting of cir-coronene graphene quantum dot (GQD) and tetraphenylporphyrin (TPP) as a sensitizer of the solar cell is investigated by using the first-principles density functional theory (DFT) and the time-dependent DFT. restrict the epitaxially grown graphene for solar cell. It can be seen from the transmittance spectra that nanofluids capture almost incident light and from the reflectance that synthesized materials absorbed more than 97.5% and 96% of the irradiated solar power. Direct absorption-based solar collectors (DASCs), which utilize homogeneously distributed optical nanofluids to absorb incident sunlight and convert it into heat, have emerged as a superior device to conventional surface absorption-based collectors for solar-thermal energy harvesting. 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