Ⅲ-Ⅴ族太陽電池特性量測與分析

Characteristic measurement and analysis of high efficiency III-V compound solar cells

吳振仲(Wu Chen-Chung)

指導教授 ： 洪榮木 ； 賴利溫

健行科技大學/電資學院/電子工程所/碩士(2008年)

摘要

本論文使用單接面砷化鎵作為太陽電池材料，於AM1.5G 100mW/cm2下其太陽電池轉換效率為20%。對太陽電池而言，元件表面之反射率扮演了相當重要的角色，因此我們利用抗反射膜來減少入射光在電池表面的反射率。且因為Ⅲ-Ⅴ族化合物半導體太陽電池與矽基板太陽電池相較之下，具有高轉換效率、高輻射阻抗、可高溫操作與適合薄膜化等優點，使其成為近年來太陽電池發展的重點之一。本論文中，我們將針對Ⅲ-Ⅴ族化合物半導體太陽電池，比較其單層與雙層抗反射層材料太陽電池之影響，並藉此I-V 特性量測結果，來瞭解抗反射膜對電池效率的改善情形。此外，我們使用聚光透鏡來增加入射光強度，以提高太陽電池之轉換效率至25.2%，並探討太陽電池開路電壓、短路電流、填充因子、轉換效率等量測參數。此外，我們比較十字線金屬電極圖案與輻射線金屬電極圖案，實驗結果顯示輻射線金屬電極圖案砷化鎵太陽電池輸出功率放大為原來的66倍，於聚光下其太陽電池不僅在開路電壓、短路電流可以得到放大效果，而且填充因子也會些微上升，因此聚光後太陽電池轉換效率可由20％提升至25.2％。

關鍵字

砷化鎵 ； 太陽能電池 ； 填充因子 ； 轉換效率

並列摘要

In this article, single-junction GaAs solar cell with a conversion efficiency of 20% under AM 1.5G 100 mW/cm2 25 ºC is developed. The reflectance on the device surface influences greatly the energy conversion efficiency of solar cell and should be considered as an important topic concerned with the practical use of solar cells. In this study, we use the technique of AR coating (anti-reflectance coating) to lessen the influence of reflectance and therefore to increase the transmittance of illuminating light.Compared with the silicon-based solar cells, the III-Vs-based solar cells present many advantages, such as high transformation, high radiation resistance, high temperature operation. For these reasons, the industry has been developing III-Vs-based solar cells for a few years. In this study, component the spectral responses of multi-junction solar cell as well as its each single junction component can be measured separately. A potential way of increasing efficiency is casting onto them a higher light intensity than is available naturally. For this reason, solar concentrators are used, and we have developed a radiative pattern for the metal grid and the GaAs solar cell is measured under 1-sun to 66-suns. The conversion efficiency of the GaAs solar cell under concentration measurement is found increased with increased concentration ratio. A maximum conversion efficiency of ~25% is obtained. We try to find a compromise between these two effects to attain a maximum conversion efficiency. The parameters of open-circuit voltage (Voc), short -circuit current (Isc), fill factor (FF), and conversion efficiency(η),under different masks of concentrated-light illuminations were also systematically analyzed.

並列關鍵字

GaAs ； Solar cell ； Fill factor ； Conversion efficiency

參考文獻

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