高效率Ⅲ-V族聚光型太陽能電池前電極之最佳化

Optimization of the Front Grid Pattern of High-Efficiency Ⅲ-V Concentrator solar cells

鍾珍珍(Chen-Chen Chung)

指導教授 ： 溫武義

中原大學/工學院/電子工程研究所/碩士(2008年)

https://doi.org/10.6840/cycu200900421

摘要

本論文探討不同圖形正電極對於聚光型砷化鎵單接面太陽能電池特性之影響。主要分析的太陽能電池輸出參數計有:短路電流(Isc)、開路電壓(Voc)、填充因子(FF)、轉化效率(η)。使用不同圖形正電極時會同時改變入射光遮蔽率與太陽能電池串聯電阻，兩者呈現逆向變化關係，須在權衡兩者下，找出適當的正電極圖形以獲得太陽能電池最高轉換效率。尤其在高聚光倍率下，太陽能電池會受到串聯電阻強烈的影響。
經由本研究的調查分析顯示，砷化鎵單接面太陽能電池在低聚光倍率下使用中心圓區域遮蔽率為6.224%的圓環狀正電極圖案時，可得最佳效率為28.5% (34，AM1.5)；但在高聚光倍率下，則使用中心圓區域遮蔽率為7.1%的圓環狀正電極圖案時其可得最佳效率為27% (106，AM1.5)。

關鍵字

砷化鎵 ； 聚光型太陽能電池

並列摘要

This thesis examines the effects of front contacts with different grid patterns on the characteristics of light-concentrated type GaAs single-junction solar cell. The device parameters analyzed include the open-circuit voltage (Voc), short-circuit current (Isc), fill factor (FF) and conversion efficiency (η). Various shadowing factor for the incident light and series resistance for the solar cell were caused by the different patterns of front contact employed. Since both effects show a reverse variation tendency to each other, one should come to a compromise between them to choose an optimal front contact for solar cell to have the highest conversion efficiency. In particular, when a solar cell is operated under a high concentration ratio of light, it is strongly influenced by the series resistance. Therefore, the aim of this study is to increase the conversion efficiency of GaAs single-junction solar cell under a high concentration of solar radiation by using a suitable ring-type front contact for device.
Important results obtained from this study are summarized as follows. For a GaAs single homojunction solar cell operating under a low light concentration ratio (34，AM1.5), a highest efficiency of 28.5% could be achieved using a ring-type front contact with a shadowing factor of 6.224% for its center circular area. Whereas, for a GaAs single junction solar cell operating under a high light concentration ratio (106，AM1.5), a highest efficiency of 27.0% could be achieved using a ring-type front contact with a shadowing factor of 7.1% for its center circular area.
Conclusively, for a solar cell to operate under a high light-concentrated condition, the series resistance caused by the device front contact should be more highlighted than the shadowing effect of the incident light.

並列關鍵字

GaAs ； Concentrator solar cells

參考文獻

1. 超高效率太陽能電池-從愛因斯坦的光電效應談起，蔡進譯，

3. 28% Efficient GaAs Concentrator Solar Cells, IEEE 1988

5. Multi-junction solar cell technologies-high efficiency, radiation

photovoltaic energy conversion.

6. Effect of base doping on radiation damage in GaAs single-Junction