研究目的
To develop an optoelectronic model for simulating different light trapping structures sandwiching the photovoltaic active layer by determining the materials dispersion and absorption properties across the entire sun spectrum (200 nm to 1700 nm).
研究成果
The paper introduces a new technique for modeling dispersive materials across the ultra-violet, visible and near infrared regions using the MEEP simulation tool, which relies on solving Maxwell’s equations using the FDTD technique. The proposed technique is unique, enabling the simulations community to model the propagation of light through materials such as Si through the entire Sun’s wavelength spectrum. A 1D grating structure was simulated to verify the utility of the developed model.
研究不足
The original LD model was not capable of modelling certain conducting and semiconducting materials over the entire range of the spectrum without portioning the spectrum into sub-bands.
1：Experimental Design and Method Selection:
The Lorentzian-Drude (LD) model was chosen for its simplicity in implementation with the finite difference time domain (FDTD) algorithm for optical modelling.
2：Sample Selection and Data Sources:
Various conducting and semiconducting materials (Ag, ITO, Au, Al, ZnO, Si, Ge, GaAs) were selected for modelling. Experimental data from literature was used for fitting.
3：List of Experimental Equipment and Materials:
MEEP (Massachusetts Institute for Technology Electromagnetic Equation Propagation) was used as a simulation platform.
4：Experimental Procedures and Operational Workflow:
The LD fitting algorithm was developed using Matlab scripting for optimization. The spectrum was portioned into sub-bands for materials like Si, Ge, and GaAs to model their behaviour across the entire spectrum.
5：Data Analysis Methods:
The mean error due to fitting process was calculated as a percentage from the measured data to verify the method.
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