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This work reports the recent advances on the synthesis and characterization of thin Cu2ZnSnS4 (CZTS) films prepared by chemical solution deposition. CZTS colloids dispersed in water-ethanol solutions were used as precursors and prepared by coprecipitation by mixing CuCl2-2H2O, ZnCl2, SnCl2 and thiourea (NH2)2CS in water-ethanol mixtures. The CZTS films were deposited on glass substrates by spin-coating...
This report presents the methods to prepare high quality MAPbI3 film for the p-i-n (inverted) perovskite solar cell. A detailed step-by step to improve the grain size and thickness of MAPbI3 film and the photovoltaic performance of the corresponding cell were discussed. The results demonstrate that the grain size of MAPbI3 film (the film quality) directly related to the efficiency of perovskite solar...
We developed lead-free perovskite solar cells, because lead is harmful to the human body. In this study, the lead-free perovskite layers were fabricated using antimony, bismuth and silver. Normal (n-i-p) and inverse (p-i-n) structures were tried for the solar cells. By using a lead-free perovskite with silver and bismuth for the normal structure, conversion efficiency of 0.892% was achieved.
The objective of this work was to investigate how cobalt oxide doped coatings in the form of thin films could affect the electrical response of silicon (Si) solar cells. Spin coated thin films consisting of a polymeric solution of cobalt oxide-antimony doped tin oxide (CoO-ATO) were used as coatings on 3" × 6" Si solar cells. Based on the spectral response of CoO-ATO, it is hypothesized...
Smart device designs with cheap materials and simple processing methods are necessary for cost-effective and efficient solar cell manufacturing. Methylammonium lead halides (MAPbTx, T = I, Br, Cl) perovskites are promising photovoltaic materials, with high power conversion efficiency (PCE>22%). Perovskite instability, however, has been one of the major obstacles for achieving device performance...
The purpose of this work is to study the anti-reflection coating structure with spherical SiO2 micro particles for the single-crystalline silicon solar cell applications. With the single and double SiO2 micro-sphere texturing anti-reflection coating structures, the surface reflectivity of the single-crystalline silicon substrate can be reduced to an average value of 5.8% and 2.85% respectively, in...
Recently, the flexible thin film solar cells such as the organic solar cells and Cu(In, Ga)Se2 (CIGS) solar cells have been attracting much attention as the photovoltaic devices, because it has many advantages such as simple process with a light weight, and its flexible large area applications. In addition, solar cells as an energy source can be applicable to the unmanned aerial vehicle (UAV) and...
The paper presents a complex process used for obtaining ZnO nanostructures for antireflective coatings. The process is suitable to silicone solar cells and can be used in order to increase their efficiency under low solar radiation, allowing the control of the morphological and optical properties of ZnO nanostructures deposited on glass through ZnO seed layer deposition process. During the research,...
The paper describes the prospects of preparing an antireflective coating based on porous silicon by electrochemical and chemical methods for photovoltaic converters with improved parameters. Application of the silicon-based porous textures as an efficient and commercially viable coating has to be maximally adapted to processes of the silicon solar cell manufacturing. In this paper the electrochemical...
In this work, we present the use of a simple, cost-effective, and manufacturable method of depositing carbon nanotubes onto metal films to create metal matrix composite gridlines for photovoltaic cells. Carbon nanotubes are deposited using a spray coating method to create layer-by-layer microstructure composites. Initial strain failure tests show the ability of composite lines to remain electrically...
We designed and numerically studied an optically asymmetric structure based on photonic nanojet effect. It can provide averaged asymmetry coefficient (ratio of forward transmission to backward one) 4.7 at averaged forward transmission 91% (in optical band) and has sheet resistance close to that of metallic film. The structure is made of abundant materials and can be produced by conventional nanofabrication...
In this work, a fluorinated resin is presented as host material for luminescent downshifting (LDS) applications carried out on polymer solar cells. The results obtained by depositing coatings with increasing concentrations of an appropriate organic fluorescent molecule on polymer solar cells show a trend with a maximum short circuit current density increase (+3.74%) at intermediate concentrations...
The surface of solar cell panels in outdoors was easy to be covered a lot of dust so the photoelectric conversion efficiency would decrease. The stubborn dusts even damage the device. In this paper, Nano-diamond coating film was prepared the surface of solar cell. Solar cell panels were usually fixed installation. However, the position of the sun was changing from east to west constantly in one day...
A breakthrough in solar cells is made using organolead halide perovskites as light harvesters with low-cost fabrication techniques. Perovskites are capable of high light absorbance, have excellent charge transport properties and have tunable band gaps. In this work perovskite solar cell (PSC) based on titanium dioxide (TiO2) thin film by spin coating technique is working as the anode, sensitized with...
It is shown that a record power conversion efficiency (PCE) of 1.25% can be obtained through coating reduced graphene oxide/n-silicon (rGO/Si) solar cell with silver nanowires (Ag NWs) and subsequently GO. rGO/Si solar cells were obtained through one step spin coating of GO on patterned n-silicon wafer followed by thermal annealing in an inert environment. Ag NWs were employed to reduce the sheet...
This paper presents main steps in design, develop and manufacture of a mechatronic system for printing ultrathin layers of perovskite solar cells. The innovation of this mechatronic system consists in its modular structure enabling the application of three different printing technologies. Some preliminary tests and results are also evidenced.
We study the efficiency of several types of all-dielectric light-trapping and antireflective coatings for the enhancement of photovoltaic absorption in thin-film silicon solar cells. We compare the photovoltaic absorption enhancement offered by a square array of nanovoids in the dielectric covering of the cell with that granted by a flat blooming layer, and a densely packed array of dielectric nanospheres.
This work demonstrated the preparation of new and effective antireflection SiC-SiO2 nanocomposite by sol-gel process for Si solar cells. The AR coating was conducted in two steps: i) sol-gel derived precursor was coated on p-type Si wafer by spin coating, and ii) the coated wafer was subjected to annealing at 450°C for 1h. The reflectance analysis revealed that SiC-SiO2 layers presented the relatively...
The Coverglass and Coatings Panel flight experiment was flown on the International Space Station. A total of 48 passive samples were flight tested. The samples included new solar cell coverglass material, coverglass replacement technology, new transparent conductive coatings, ultraviolet rejection coatings, and anti-reflection coatings. The experiment was returned to earth after 543 days on-orbit...
As crystalline silicon solar cells may be approaching efficiency limits, a promising approach to further efficiency gains is a stacked, tandem system consisting of silicon and below silicon band gap cells capable of utilizing a larger range of the solar spectrum. In this work, we analyze a textured silicon cell with coatings optimized to transmit below band gap photons. For the first time, our model...
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