Simulation of Thin-Film Solar Cells for Optimization of Light Trapping

• Main Authors: Lin,Shang-Ju, 林尚儒
• Other Authors: Albert Shihchun Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/97917321265144687933

碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 103 === ii Simulation of Thin-Film Solar Cells for Optimization of Light Trapping Student：Shang-Ju Lin Advisors：Dr. Albert Shihchun Lin Department of Electronics Engineering &; Institute of Electronics Engineering National Chiao Tung University ABSTRACT Recently, most scientists pay significant attention to nano-/micro-technologies of solar cells. The light trapping technologies are used to reduce the reflection of incident light, to scatter the incident light by rough surface, and to increase the absorption of solar cells. The light trapping technologies have the main applications for thin-film silicon solar cells, including using rough surfaces, single dielectric layer interference, design of multilayers, nanowires, and so on. In chapter two, we will introduce how the power of thin-film solar cell generate and the theories of light trapping structure in detail. These include the diffraction theories, the diffraction of sunlight on the surface, and the diffraction efficiencies. Afterward, we use genetic algorithm to find the optimal light trapping structure with two methods of simulation. We will also introduce the theories and applications of genetic algorithm, and how the optimal simulation process works. In chapter three, we will introduce the simulation software, TCAD, which is often used to compute the optical and electrical properties of solar cell. In this work, we only introduce the simulation of the optical properties. We set up an optimization process that we can find the optimal light trapping structure by TCAD. As long as we set the parameters and structures of solar cell, the optimal simulation process can help us find the optimal light trapping structure. In the optimization processes, that genetic algorithm calculates the solar cell absorbance continuously, and the structure is adjusted every time. By repeating this process, we will find the optimal light trapping structure.In chapter four, we use another method, RCWA( Rigorous coupled-wave analysis ), to calculate the reflection and absorption of the sunlight incident of solar cell, but the main purpose is still that we want to find the optimal light trapping structure. We use the method that is like the one we used in chapter three to find the optimal light trapping structure, through continuous simulations and calculations. In final chapter, we discuss and summarize the two optimization methods, and then we propose the future prospective of this work.