Papers by Keyword: Photovoltaic (PV)

Abstract: The self-cleaning technology for solar cell array can promote efficiency of electricity produced and protect the solar cell. In this paper, a method of dusts-removal based on travelling-wave dielectrophoretic force was proposed. The theory of travelling-wave dielectrophoresis and the adhesion model between the dusts and the surface of the solar cell array were analyzed. According to the theory and the fabricating process of the film, the structure of the self-cleaning film for large solar cell array was designed.

Abstract: Solar cells employing heterojunction emitters of amorphous silicon (a-Si) on a monocrystalline silicon (c-Si) substrate have demonstrated high efficiencies without requiring high-temperature processing [. An example of such a cell structure is shown in Figure 1. It has been found that the cell efficiency can be boosted by inserting a thin undoped (intrinsic) a-Si layer between the a-Si emitter and the c-Si substrate. The thin intrinsic layer provides very good passivation of interface defects, thus reducing the surface recombination velocity.

Abstract: Simple two-step wet-chemical cleans composed of an oxidizing step with in water dissolved ozone followed by an etching step have been studied for high-efficient hetero-junction silicon solar cell applications. For this purpose flat Si (111) samples passivated with amorphous silicon have been investigated. The effect of nanoroughness of the crystalline silicon surface on the minority carrier lifetime is shown. An influence of the storage time between cleaning and a-Si:H deposition was found and can partly be attributed to changes in surface roughness and native oxide growth.

Abstract: The photovoltaic industry has maintained a rapid growth rate of more than 46% over the last 15 years. At the same time, the price of PV modules have continuously decreased to a point where PV is now at grid parity on the customer side of the meter in geographic areas with high incentives combined with high solar irradiation or high electricity price. The rapid growth rate of the PV industry is expected to continue and even accelerate as the regions with grid parity spread to more parts of the developed world. This is due to a combined reduction in the price of PV modules and an increase in the price electricity. Among all the different PV technologies, crystalline silicon solar cells have maintained a strong dominance of more than 82.5%. Thanks to extensive studies of silicon material properties, mechanisms of carrier recombination and the development of ultra-clean processing, the efficiency of silicon solar cells have reached more than 22% in large volume production and 25% in laboratory, and is approaching the theoretical maximum efficiency of silicon cells of about 29%.

Abstract: A synthetic approach to synthesize 4,8-Dibromobenzo-[1,2-c;4,5-c’] bis[1,2,5]thiadiazole from a common precursor 2,1,3-Benzothiadiazole is reported. This unit can then be used in the synthesis of low bandgap materials via palladium-catalyzed coupling reactions.

Abstract: In this research paper we present a new high efficient three-junction photovoltaic cell with anti-reflective coating. The aim of our research work is to improve the photon absorption and reduce the photon reflection as well as the trasmission. The use of anti-reflective coating (ARC), Gallium-Phosphide-Oxide on the photovoltaic cell based on InGaAs/InGaSb has increased the photon absorption significantly. In this work we have analyzed the photon absorption, photon reflection and photon transmission of existing high efficient solar cells. Real Time Photonics Simulator has been used to simulate the performance of the solar cells. The simulation results show that with the inclusion of Gallium-Phosphide-Oxide on the multi-junction photovoltaic cell the photon absorption increases significantly. Our three-junction photovoltaic cell based on GaPO/In0.53Ga0.47As/In0.5Ga0.5Sb shows dramatic improvement of photon absorption in the range of 479nm – 767nm wavelength of the solar spectrum. With the addition of GaPO in place of GaP we see a tremendous increase of photon absorption, which significantly increases the efficiency of the photovoltaic cell

Abstract: A soluble, solution-processable metallopolyyne of platinum (II) functionalized with electron-deficient pyrimidine spacer was synthesized. The spectroscopic and photophysical properties of the polymer was also presented.

Abstract: This paper presents technology of multicrystalline silicon solar cells with laser texturisation step. The texturing of polycrystalline silicon surface using Nd:YAG laser makes it possible to increase absorption of the incident solar radiation. Moreover, the additional technological operation consisting in etching in 20 % KOH solution at temperature of 80°C was introduced into technology of the photovoltaic cells manufactured from laser textured wafers allows to remove laser induced defects but cause the texture to flatten out reducing it optical effectiveness. This paper demonstrates, that laser processing is very promising technique for texturing multicrystaline silicon independent on grains crystallographic orientation compared to conventional texturing methods in technology of solar cells.

Abstract: As the rise both of the ships tonnage and the level of electrification heightened, the capacity of the ship power station has also been increased. Therefore, more large-capacity vessels generating units are used to satisfy the needs of the power system in the ship. This paper, by using the PSCAD simulation software, a dynamic simulation model of ship power system is established based on model elements such as prime mover, generators, control device, motor and the related load, based on which the defined load operating process is studied, and the steady state and dynamic performance of the ship power system are obtained. In order to energy saving and make full use of solar energy, in the ship power system, a photovoltaic device is used, and its output DC power is converted into the ship system using three-phase AC power by a inverter. For such a power system, the influences of addition of large-scale energy storage and new power supply equipments on ship power system are analyzed.

Abstract: A new electron-rich unit, 2,7-di(5-bromothiophen-2-yl)-10-hexadecyl- phenoxa-zine, has been prepared in high yield over four steps. The compound with good solubility, electronic and optical properties may be a candidate for D-A type organic polymers.