The study of various antireflectance coating layer on GaAs solar cell

• Main Authors: Yi-WenLee, 李宜玟
• Other Authors: Yan-Kuin Su
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/54979226975842987073

碩士 === 國立成功大學 === 光電科學與工程研究所 === 98 === Because of the energy shortage and the oil crisis are getting more and more serious. How to find renewable energy to replace the oil is an important issue for our live! The solar power is a turning point of the new sources of energy. Sun generate light and heat every day. It is worth to research how to convert the solar energy to electricity to satisfy our demand.. The highest conversion efficiency in different kind of solar cells can be found in the III-V compound solar cell. The advantages of the III-V solar cell are high absorption coefficient, high conversion efficiency, high radiation resistance, broad spectral response and concentrator system integratable. This tandem structure can be used in III-V compound solar cells to utilize the entire solar spectrum, and the radiation resistance makes it suitable for space application. We use Metal-organic Chemical Vapor Deposition (MOCVD) method to grow the simplest structure single junction GaAs solar cell and add antireflection coating layers on the devices to enhance the light transmission. The enhancement of light transmission helps to generate more electron-hole pairs. Therefore both of the current density and the efficiency of solar cells can be increased. The effect of thin film and textured antireflection coating on GaAs solar cells to enhance the conversion efficiency will be investigated in this thesis. We use MATLAB software simulation to find out the best combination of refractive index and thickness of the thin film antireflection coating layer and utilize the sol-gel method to prepare the thin film with ZnO and MgF2 on the GaAs solar cells, which can help to reduce the reflectivity to 10%. And the conversion efficiency can be improved for about 30%. Next we discuss various textured surface with micro-scale pattern by using imprint method to form the antireflection coating layer on the cells and investigate their effect. The triangular shape micro-prism formed by EPOXY is the best result and can reduce the reflectivity to 11%. And enhance the conversion efficiency for about 28%. Finally we try to adopt the ZnO nanowire grown on the solar cell by using chemical bath deposition method to evaluate the influence of the solar cell. The best result of this method can reduce the reflectivity to 10%. And the conversion efficiency can be enhanced to about 42%. Then we compare all three types of antireflection coating on the GaAs solar cells to find the best result tof conversion efficiency enhancement. The antireflection coating layer can easily improve the conversion efficiency of solar cells and make them more popular in our daily life. As a result this technology will make the dream of green world more promising.