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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Numerical simulation of an ozone-based wet-chemical etching
摘要： In the PV-industry, wet-chemical baths are used for surface structuring, conditioning and cleaning. Besides cleaning the wafers, ozone-based wet-chemical cleaning processes show the ancillary effect of intendedly etching back the emitter and/or rounding of textured surfaces. To simulate and predict this rounding of micro-pyramids during the cleaning process, a two dimensional process simulation model was built. With the finite element method of COMSOL Multiphysics the diffusion and convection based mass transport of ozone along the pyramids is described. Important parameters for the evaluation, obtained from experimental results, are the etch rate and resulting roundness (R) of the micro-pyramids tips. A parametric study was carried out with the purpose of adjusting the model. The simulation represents the experimental data accurately, e.g. after 2 min exposure time R = 67 nm for the experimental and R = 66 nm for the simulation data.
关键词： PV-industry,numerical simulation,micro-pyramids,ozone-based wet-chemical etching,COMSOL Multiphysics
更新于2025-09-11 14:15:04
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Band Gap Optimization Design of Photonic Crystals Material
摘要： The photonic crystal has a fundamental characteristic - photonic band gap, which can prevent light to spread in the crystals. This paper studies the width variation of band gaps of two-dimension square lattice photonic crystals by changing the geometrical shape of the unit cells' inner medium column. Using the finite element method, we conduct numerical experiments on MATLAB 2012a and COMSOL 3.5. By shortening the radius in vertical axis and rotating the medium column, we design a new unit cell, with a 0.3*3.85e-7 vertical radius and a 15 degree deviation to the horizontal axis. The new cell has a gap 1.51 percent wider than the circle medium structure in TE gap and creates a 0.0124 wide TM gap. Besides, the experiment shows the first TM gap is partially overlapped by the second TE gap in gap pictures. This is helpful to format the absolute photonic band gaps and provides favorable theoretical basis for designing photonic communication material.
关键词： band gap,photonic crystals,finite element method,MATLAB,COMSOL
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Kiev (2018.4.24-2018.4.26)] 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Efficient Geometry of Surface Plasmon Resonance Based Fiber Optic Sensor
摘要： The efficient structure for optical fiber based surface Plasmon resonance sensor has been investigated. The sensor structure is based on removing the cladding of a multimode optical fiber and replacing it with thin film of gold. The incident light inside the fiber will excite surface plasmons which will be resulted in the absorption in specific wavelengths. The absorption behavior is dependent on the dielectric constants at the vicinity of the metallic thin film. Based on the amount of removed cladding and deposition regions on the core structure of the fiber, different configurations can be considered. Based on the computational analysis, we have studied performance of sensor for three different configurations. Our method of study is based on solving wave equation in different sensor geometry and calculating absorption for different available modes using Finite Element Method in COMSOL environment. The results of our study show that, the optimum configuration of sensor considering wavelength sensitivity is for a fiber which half of core and cladding has been removed and the gold thin film is deposited on its surface.
关键词： Refractive Index Sensor,Surface Plasmon Resonance,SPR Fiber,Fiber Based Sensor,Finite Element Method,COMSOL
更新于2025-09-10 09:29:36
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AIP Conference Proceedings [Author(s) INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2018 (ICCMSE 2018) - Thessaloniki, Greece (14–18 March 2018)] - Investigation of terajets produced by dielectric parallelepiped structure
摘要： In this article the generalized results of full width at half-maximum intensity (FWHM) of the “terajets” are presented for a parallelepiped structure made of eight different photopolymers in the frequency range of 0.04-0.2 THz. Its S-parameters were obtained in COMSOL Multiphysics software. After the analysis of the transmission and reflection spectra the “terajet” effect was observed at the specific resonance frequencies. This gives us an opportunity to predict this effect and create narrow-band devices based on it in THz imaging and sensing.
关键词： sensing,photopolymers,THz imaging,COMSOL Multiphysics,dielectric parallelepiped structure,terajets
更新于2025-09-09 09:28:46
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Light Entrapping, Modeling & Effect of Passivation on Amorphous Silicon Based PV Cell
摘要： This research paper present efforts to enhance the performance of amorphous silicon p-i-n type solar cell using sidewall passivation. For sidewall passivation, MEMS insulation material Al2O3 was used. The main objective of this paper is to observe the effect of sidewall passivation in amorphous silicon solar cell and increase the conversion efficiency of the solar cell. Passivation of Al2O3 is found effective to subdue reverse leakage. It increases the electric potential generated in the designed solar cell. It also increases the current density generated in the solar cell by suppressing the leakage. Enhancement in J-V curve was observed after adding sidewall passivation. The short circuit current density (Jsc) increased from 14.7 mA/cm2 to 18.5 mA/cm2, open circuit voltage (Voc) improved from 0.87 V to 0.89 V, and the fill factor also slightly increased. Due to the sidewall of passivation of Al2O3, conversion efficiency of amorphous silicon solar cell increased by 29.07%. At the end, this research was a success to improve the efficiency of the amorphous silicon solar cell by adding sidewall passivation.
关键词： Aluminum Oxide,Electric Potential,Passivation,COMSOL Multiphysics,Amorphous Silicon,Current Density
更新于2025-09-09 09:28:46
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[IEEE NAECON 2018 - IEEE National Aerospace and Electronics Conference - Dayton, OH, USA (2018.7.23-2018.7.26)] NAECON 2018 - IEEE National Aerospace and Electronics Conference - Indium Tin Oxide/Barium Strontium Titanate THz Sensor Antenna
摘要： A Bow-Tie ITO/BST and Au/BST antennas were designed and analyzed using the finite element, Multiphysics COMSOLTM program. The study shows that the outputs peak at several modes and ITO antennas allow for the integration of the antenna with optoelectronic devices.
关键词： COMSOL FEM Modelling,THz,Nano-Antenna
更新于2025-09-04 15:30:14