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Enhance the solar cell efficiency by reduction of reflection losses
摘要： The enhancement of the solar cell efficiency field has been achieved in many methods due to the different factors and conditions that led to loss the solar energy .This work deals with the increasing of the efficiency of solar cell that made of single crystalline silicon .This increment achieved by the reduction of biggest type of losses of the conversion efficiency named reflection . by using two methods first ; forming grooves on the surface using pulse Nd:YAG laser with max energy 1J and pulse width 10ns, using the fast and accurate movement of the 3D optical galvo mirror scanning system to form the grooves , the second method was by deposition nanomaterials as Silver (Ag) and Cadmium telluride (CdTe) to constitute an antireflection layer for the incident solar spectrum . The effect of antireflection layer material type and the effect of incident light angle on the reflection had been studied in this work .The reflectance had been measured by a system designed and built to give the reflection for angles ranged 0 – 180 degree controlled by Microcontroller. The result inducate that increase in conversion efficiency was 28.3% for Ag/Si , and 32.9% for CdTe/Si than the original efficiency of Si solar cell.
关键词： silicon solar cell,reflectance,laser texture,nanoparticles,antireflection surfaces
更新于2025-09-11 14:15:04
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Surface modification of silicon solar cell using TiO2 and Ta2O5: fabrication and characterization
摘要： We report the fabrication and characterization of surface modified silicon solar cells with the deposition of amorphous tantalum oxide (Ta2O5) and crystalline titanium oxide (TiO2) nanolayers of thickness 54.9 nm and 69.82 nm, respectively, as antireflection coating (ARC) using RF-sputtering technique. The thickness of the films measured by variable angle spectroscopic ellipsometry and scanning electron microscopy is in close agreement. The transmittance measurement as a function of wavelength of incident light showed that the thin-films deposited have lowest effective reflectance in the wavelength range of 380 nm–570 nm indicating reduced light reflection and enhanced light trapping as observed from UV–Vis measurements. Illuminated current–voltage measurements showed an increase in the short circuit current density (Jsc) and an increase of 1.54% in the efficiency of the antireflection-coated cells. Results of the External Quantum Efficiency measurement as a function of wavelength for the solar cells with ARC is also presented in this paper.
关键词： Antireflection coating,TiO2,Ta2O5,RF-sputtering,Silicon solar cell
更新于2025-09-11 14:15:04
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Utilization of 2D gahnite nanosheets as highly conductive, transparent and light trapping front contact for silicon solar cells
摘要： The current scenario illustrates distinct interest in developing renewable energy sources for power generation. In this regard, several researches are performed in enhancing the power conversion efficiency of solar cells. The present work focuses on utilizing ZnAl2O4 (gahnite) spinel as antireflection coating material to improve the power conversion efficiency of silicon solar cells. Gahnite was synthesized using two precursors namely zinc nitrate hexahydrate and aluminum nitrate nonahydrate through sol–gel technique. The thickness of the prepared gahnite sheets measured through atomic force microscopy was around 50?nm. Single to quintuple layers of gahnite was deposited on silicon solar substrate using spin coating technique. The influence of gahnite coating on the structural, optical, electrical properties and cell temperature of silicon solar cells are analyzed. The synthesized gahnite bears spinel crystal structure in the form of two dimensional nanosheet. Increment in layer thickness proves the deposition of single to quintuple layer on silicon substrate. A maximum of 93% transmittance and 20.72% power conversion efficiency at a low cell temperature (39.4?°C) has been achieved for triple layer deposition proving diffusion of more photons on the substrate. The obtained results prove gahnite as suitable anti-reflection coating material for enhancing the power conversion efficiency of silicon solar cells.
关键词： Anti-reflection coating,Silicon solar cell,Gahnite,Power conversion efficiency,Sol–gel
更新于2025-09-11 14:15:04
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[IEEE 2018 2nd IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) - Delhi, India (2018.10.22-2018.10.24)] 2018 2nd IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) - Development of a Characterization Tool for Determination of Sheet Resistance at 9 Places of Large Area 156 mm by 156 mm Diffused Silicon Wafer in Less than 5 Seconds and Its Application in Making High Efficiency Silicon Solar Cells
摘要： Sheet resistance measurement using 4 probe method is a very well established technique for measuring the sheet resistance of a thin film on a substrate. This technique is widely used to measure the sheet resistance of diffused silicon wafer in solar photovoltaic industry. However with respect to solar cell industry, the drawback associated with this technique is, it measures the sheet resistance of a very small area. For a large area silicon wafer of size 156 mm by 156 mm, a four probe sheet resistance measurement instrument will take several minutes to take readings at several places on the entire area of the wafer. In the present work a solar cell characterization tool is developed for measuring the sheet resistance at 9 places on a diffused silicon wafer using 9 four probe heads mounted on a single plate. The characterization tool developed in the present work can tell the uniformity of diffusion in a diffused silicon wafer within few seconds on the screen of a computer monitor. Continuous data logging helps in characterizing wafers which are >50,000/day in any smallest PV industry.
关键词： Sheet Resistance,crystalline silicon solar cell,Four probe technique,Shallow emitter
更新于2025-09-11 14:15:04
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Photovoltaic output parameters of a mono-crystalline silicon solar cell with non-uniform horizontal temperature distributions
摘要： Temperature inhomogeneity occurs frequently in the application of photovoltaic devices. In the present study, the effect of nonuniform horizontal temperature distributions on the photovoltaic output parameters of a monocrystalline silicon solar cell including short-circuit current, open-circuit voltage, output power, etc. was investigated. A laser beam irradiated on the center of the cell surface was used to obtain nonuniform temperature distributions. The results show that the higher initial temperature region of the solar cell absorbs more heat energy and achieves higher temperature than the lower initial temperature region after exposure to the same sunlight. Meanwhile, the photovoltaic parameters vary with the temperature difference between the center and edge of the solar cell. The maximum output power decreases exponentially with the temperature difference. The output power under an external load resistance of 1 X is almost inversely proportional to the temperature difference. According to the experimental results, when the temperature difference between the center and edge of the solar cell changes from 0 K to 60 K, the open-circuit voltage, maximum output power, output current, and power under external load resistance of 1 X would decrease by 4.8%, 4.8%, 5.1%, and 9.8%, respectively. The photovoltaic ef?ciency decreases when the temperature distribution is nonuniform.
关键词： nonuniform temperature distributions,photovoltaic output parameters,output power,open-circuit voltage,monocrystalline silicon solar cell,short-circuit current
更新于2025-09-11 14:15:04