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The effect of silicon quantum wires (SiQWs) diameter of heterojunction solar cells based on SiQWs with rectangular cross sections and graphene (SiQWs/G) is investigated using a coupled optical and electrical model. It is found that SiQWs/G with small cross section area (d2=4 nm2) shows high efficiency. because, the band gap of SiQWs obtained from the distance of energy state of wave function of the...
Methylammonium lead halide perovskites (MAPbX3, where X = I, Cl, and Br) have come in the spotlight as alternative devices of silicon for next-generation solar cells owing to its extraordinary photovoltaic property, ease of fabrication, and low cost, which has exhibited power conversion efficiencies of up to 20.5% [1]. In addition, perovskites have recently shown the further application in optically-controllable...
Quasi-monocrystalline germanium (QMC Ge) is investigated for potential applications in high-efficiency, low-cost multi-junction solar cell design. The morphology and electrical resistivity of QMC Ge is characterized and computer simulations of MJSCs on Si substrates using QMC Ge interface layer are developed.
Light trapping strategies that lead to an enhancement of the light absorbed by a device is a direct way to improve solar cells behavior. Light trapping strategies that lead to an enhancement of the light absorbed by a device is a direct way to improve solar cells behavior. The texturization of one or more surfaces is an industry standard in solar cells manufacturing. In the particular case of crystalline-...
Silicon double heterojunction (DH) solar cells represent a possible future path for high-efficiency, low-cost solar power. These cells forgo doped p-n and n+-n (or p+-p) homojunctions diffused at ∼900 °C in favor of < 200 °C-deposited selective heterojunction contacts, which block one type of carrier while allowing the other to pass freely[1]. One heterojunction injects minority carriers (blocking...
In the early days, the Device Research Conference (DRC) has played a seminal role in the initial announcement of breakthroughs that led to new and improved devices and chips found in today's semiconductor market menu. I will briefly cite personal and collegial examples of compound semiconductor breakthroughs that occurred during what I view as the miracle decade of 1965–1975. I cite this era because...
In this paper, we introduce the possible texturing methods and their effects on the performance of multicrystalline silicon solar cells. A 2-D process and device simulator is used for this purpose and the resultant efficiency increase is studied. The optimized texturing angel is deducted by theoretical calculations of ray tracing. Theoretical calculations show that the best texturing angle to have...
Growing Photovoltaic (PV) panel waste causes a new environmental challenge, but on the other hand opportunities to create value and new economic paths. The main vision of the European project CABRISS “Implementation of a circular economy based on recycling, reused and recovered indium, silicon and silver materials for photovoltaic and other applications” is to develop a circular economy mainly for...
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...
We discuss the synthesis of zinc oxide (ZnO) and cadmium telluride (CdTe) quantum dots (QDs), the characterization of their optical properties on their own as well as combined, and their influence on the power conversion efficiency of photovoltaic structures when the QD blends were dispersed in a polymeric solution and deployed on the window surface of polycrystalline Si solar cells as down-shifting...
Different GaAs//Si wafer bonding approaches are compared in order to fabricate III-V tandem solar cells. Bonding interface characteristics and electrical properties will be discussed for standard and improved direct wafer bonding sequences as well as for covalent bonding technique using SAB.
A cost-effective lateral beam splitting photovoltaic system coupling a Si cell and a InGaAs photodiode through a long-pass dichroic filter has been designed, manufactured and tested under illumination with a Sun simulator and direct solar irradiation. Two filters with different cut-off wavelengths have been considered: 950nm and 1100nm, best efficiencies are achieved with the 950nm cut-off one due...
In this paper, a new approach based on ZnO/Silicon interface engineering aspect is proposed to enhance the absorbance performance for n-ZnO/p-Si hetero-junction based solar cell. The merits of using grooves morphology in the ZnO/Silicon interface to improve the photovoltaic performance are investigated numerically using accurate solutions of Maxwell's equations. It is found that the proposed interface...
A thickness controlled dual junction GaAs//Si solar cell for current matching was fabricated and demonstrated. The optically thin GaAs top cell grown by metal-organic vapor phase epitaxy (MOVPE) was directly integrated on the Si bottom cell by surface-activated bonding (SAB) method. Owing to the optically thin (∼300 nm) GaAs top sub-cell, the operation of current-matched dual junction cell was observed...
We fabricate InGaP/GaAs/Si hybrid triple-junction (3J) cells with different sheet resistances of bonding layers in Si bottom cells. We estimate resistances across the p-GaAs/n-Si bonding interfaces of the respective 3J cells by measuring the potentials of the bonding layers. We find that the interface resistances are higher in 3J cells with the bonding layers of Si bottom cells with higher sheet resistances.
Textured ultra-thin silicon wafers were obtained by means of chemical etching in potassium hydroxide solution. The surface morphology and roughness of ultra-thin silicon wafers were investigated depend on their thickness, doping level and texturing. Based on thinned silicon substrates the heterojunction solar cells were produced. It was determined clear dependence of photovoltaic properties on surface...
The Staebler and Wronski light soaking effect [1-3] in hydrogenated amorphous silicon (a-Si:H) results as a worsening of solar cell performances under light soaking which results in a substantial loss of cell power conversion efficiency compared to time zero performance. In this work, comparing the behavior of single a-Si:H p-i-n devices with that of tandem a-Si:H / microcrystalline Si solar cells,...
In this paper, four designs for intersecting silicon Nano wall with planar nano-gold layers are proposed and simulated. Nano-gold layers are employed to create plasmonic modes at the Si/Gold interface. Adjusting the dimensions of the proposed hybrid Si-Gold structures shows 79.3% enhancement in the ultimate efficiency over the Si veins structure.
In this paper, fuzzy logic based proportional integral derivative controller with filter (PIDF) is proposed for photovoltaic array fed multilevel converter. Initially, the test is carried out using conventional PIDF controller and it yields poor transient response due to the improper tuning of its gain values. Secondly, a fuzzy-tuned PIDF controller has been designed and implemented. The fuzzy controller...
The principle objective of this paper is to demonstrate the increased efficiency of graphene photo-voltaic panel for the application of self illuminating light bulb, also to overcome the problems regarding portability, implementation and cost using emerging material graphene. Graphene material is 2D allotrope of carbon with extraordinary quality like high electrical and heat conductivity with better...
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