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The GaAsP/Si dual-junction solar cells have been systematically investigated in our paper by using AMPS (Analysis of Microelectronic and Photonic Structures). Based on the optimized results of single-junction solar cells, we propose a promising method to improve the properties of the dual-junction solar cell. And the monolithic GaAsxP1−x/Si dual-junction solar cells with various As compositions (x=0...
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...
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...
Photovoltaic (PV) cells are important devices that can be used to convert photons into electrical energy. However, the cost of current PV devices needs to be significantly reduced and their efficiencies need to be substantially enhanced to enable large scale implementation of PV cells as sources of clean electrical energy. Surface plasmon polaritrons (SPP) in metallic nanostructures in close proximity...
The use of Kelvin Probe Force Microscopy to investigate PN junctions under illumination and electrical bias has been shown to be an effective way to analyze the electrical properties of solar cells at the nanoscale. We use it here, for the first time, on interdigitated back contact solar cells. Measurements are performed between the metallic fingers under an electrical bias in the dark and under illumination...
Three different series of p-type (100) Crystalline Silicon (c-Si) FZ wafers of about 270 μm thickness with resistivity of 2–4 Ω-cm were textured by three different concentrations of KOH (2.5 wt.%, 3.5 wt.%, and 4.5 wt.%). For every series of textured wafers, three samples were textured, each of 1×1.5 inch2 size. The texturing process was interrupted at different duration of 20 min, 40 min, and 60...
Single crystal Si bulk solar cells were fabricated by growing p+-Si film on n-type Si(100) substrate as a emitter layer by sputter epitaxy at 315°C for the first time. Internal quantum efficiency (IQE) at visible light wavelength was higher than 95%, resulting in a short circuit current of as high as 21 mA/cm2 even without surface texturing and anti-reflection films.
The biggest disadvantage of the solar cell is that the solar cells don't absorb all the light which is incident on them. It captures only the UV portion of the sunlight i.e. only 4–10% of the solar light incident. Therefore to increase the solar energy conversion efficiency the absorption should be extended to visible and IR region also. This is done with the help of depositing nano particles (nano...
This work describes the latest development in solar cell fabrication technology for enhancing its performance specifications such as efficiency, fill factor, multispectral operation… etc and its reflections on the power consumption and savings in the Egyptian electrical power networks in different regions, especially distant unserviced regions. Analytical results showed a great enhancement in electrical...
Nanocarbon‐based photodevices show many interesting characteristics useful for solar cells production. The uses of carbon nanotubes and graphene for nanocarbon/silicon heterojunction solar cells are reviewed in this chapter. Nanocarbon serves multiple functions as transparent electrode, active junction layer, hole collector, and antireflection layer in the nanocarbon‐on‐silicon heterojunctions. A...
In our research work electrical characterization with different generation of solar cells depending upon the emergence as- First Generation: Mono and Poly-crystalline Silicon, Second Generation: Thin-film Solar Cell, Third Generation: Full Spectrum Utilization with comparative efficiency study of different solar cells is investigated. Besides, major part of our research is Multi-Junction Solar Cells...
In this manuscript is discussed the potential of using silicon heterojunction solar cells to obtain flexible silicon modules. Modules were manufactured using non-metalized silicon heterojunction solar cell with thicknesses down to 70 µm. The modules were rolled around curved surfaces with different diameters. Rolling diameters down to 5 cm were tested. Damages in the solar cells due to the rolling...
In recent year, anneal process have been used ro reduce the dead layer and higher phosphorous active ratio by separating deposition and drive-in process. In this paper, two process flows are demonstrated on silicon mono-crystalline PERC cells ro investigate rhe improvement wiih anneal process. Higher minority carrier liferiine and lower emitter saturation current density are shown due to higher active...
CdTe cell efficiencies have increased from 17% to 21% in the past three years and now rival polycrystalline Si [1]. Research is now targeting 25% to displace Si, attain costs less than 40 cents/W, and reach grid parity. Recent efficiency gains have come largely from greater photocurrent. There is still headroom to lower costs and improve performance by increasing open-circuit voltage (Voc) and fill...
Previously, an innovative way to reduce rear interface recombination of Cu(In,Ga)(S,Se)2 (CIGSSe) solar cells has been successfully developed. In this work, this concept is established in Cu2(Zn,Sn)(S,Se)4 (CZTSSe) cells, to demonstrate its potential for other thin-film technologies. Therefore, ultra-thin CZTS cells with an Al2O3 rear surface passivation layer having nano-sized point openings are...
Silicon heterojunction (SHJ) technology enables high performance photovoltaics at acceptable cost. In this article, we show that this technology is also well suited for low to medium concentration applications. For this purpose, SHJ cells have been optimized and tested at different illumination levels and temperatures. An interesting increase of the efficiency temperature coefficient is observed with...
A method of patterning atomic layer deposition (ALD) deposited aluminium oxide dielectrics (Al2O3) using an inkjet printer is outlined. This method has applications in creating PERC cell type rear contacts. It is simpler, and uses fewer chemicals than immersive etching techniques such as those involved in photolithography, and the patterning does not cause damage to the silicon evident in laser ablation...
This paper delves into the electrical characterization of the laser induced damage and in the removal of the damage by the chemical treatment. We believe that an accurate etching removes properly the damage so that there could be more pros than cons that give advantage to this isolating method than the inline expensive wet etching isolating method. For that, a fabrication process is established, which...
Dust or soot from the air causes significant losses in the PV modules. Evaluating the performance loss of photovoltaic modules in a location involves collecting data from a fielded PV system. This is usually a time consuming and a costly affair. Hence we propose collection of dust from an area, preferably from the module surface, and use it as dust sample so that the soiling experiments can be conducted...
As photovoltaics (PV) cost reduction driven by economies of scale is approaching a limit, technological breakthroughs are likely to become again the next driver for further growth. In this paper, we review the most significant photovoltaic (PV) device technologies. First, commercially available cells and modules are briefly surveyed, focusing on the innovations that have recently reached the market,...
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