Process-related Solar Cells Performance
| Autor: | Mu-Shih Yeh, 葉沐詩 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 The solar energy is a natural energy easily obtained, it is one of the most convenient, regardless of region of energy, and there is no pollution produced, it has not been widely used, due to high costs, low efficiency, and convenience issues. In this study, phosphorus diffusion solar cells with characteristics of the manufacturing process. In this study, the p-type silicon wafer as a substrate, phosphorus diffusion at high temperature furnace diffusion process to make single-crystal silicon solar cell p-n junction. After using the thermal evaporation of aluminum wire to form a solar battery and the negative. Without making any improvement in the surface treatment of the solar cell, due to the refractive index of incident medium refractive index and different, which led to the incident light in the cell surface of the optical return loss is quite large, it is necessary for improvement for the surface to effectively reduce the light on the surface reflection loss, enhance opportunities for the incident light to the internal battery can be fully effective use of light, thereby enhancing the conversion efficiency of solar cells. Re-use of I-V measurement system voltage and current measurement curves, and measured open-circuit voltage and short-circuit current. Traditional solar cells surface, did not make any improvement, incident light on the surface of the optical return loss is quite large. Therefore, we have to improve the surface of solar cells, can effectively reduce the surface reflection loss of light to enhance the opportunities within the incident light to the battery will be fully effective use of light to enhance the conversion efficiency of solar cells. This study has two main directions: First of all, for improvement for the surface treatment (surface roughness structured), hoping in the chosen spectral range, were lower reflectivity. In the single crystal silicon solar cells in the surface roughness, for the larger area affected by light, incident light to multiple reflection, the opportunity to increase light absorption. Solar cell structure of the surface roughness is an important step in the formation of inverted pyramids in the surface groove structure, and high efficiency single crystal silicon solar cell production is often used. In this study, using the P-type crystal to the silicon as a substrate. Reverse of etching using KOH solution, the crystalline structure of the inverse pyramid groove. KOH solution at different temperature and time, there is a different etching rate and process parameters were studied. The second for the positive electrode and negative electrode, the use of nickel electroless plating and electroless plating of copper. This experiment has a low temperature and simple process, increasing the thickness of the metal electrode. The impact of metal shielding electrodes, metal electrodes must be reduced in the active area, but too little of the shadow area, resulting in high current, fill factor decreased. So try to compromise these two effects, to achieve the best conversion efficiency, to reduce series resistance and shunt resistance, to improve conversion efficiency. Finally, the surface roughness, non-electrical plating method used in solar cells, by reducing the surface reflection of incident light and increase the chance the incident to the internal battery, as well as reduce the series resistance and shunt resistance, to improve the efficiency of solar cells. Keywords: . |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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