STD Cell
Laser power density:117w/cm2&acid 2min Cell
圖 4-16 IV 效率圖
表 4-1 IV 參數比較
Isc(mA) Jsc(mA/cm2) Voc(mV) F.F Eff(%) Rs(mohm)
雷射 結構 電池
150 37.6 555 0.668 13.9 0.347
標準 結構 電池
149 37.4 611 0.695 15.9 0.269
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由圖 4-16、表 4-1 可看出雷射電池之 Voc=555mV、Jsc = 37.6 mA/cm2，與標準電池 的 Voc = 611mV、Jsc = 37.4 mA/cm2比較，Voc 降低了 56mV，Jsc 提升了 0.1mA/cm2， 由於雷射形成之的蜂巢結構有很大的高低差表面，此表面在覆蓋抗反射層(氮化矽) 時會造成覆蓋不均勻之情況，可能洞口之氮化矽比較厚，側壁及洞的底部只有少量的 氮化矽，此抗反射層的反射率雖然也會下降，但是氮化矽之鈍化效果卻大大的下降，
使得表面的缺陷沒有得到修補，在電子電洞對傳導時增加復合之機會，使得 Voc 與 Jsc 都下降導致效率無法有效的提升。在表面復合增加的情況下，蜂巢式結構的電池，
Jsc 還是有 37.6mA/cm2，代表此結構還是有提升電流之效果，如果再嘗詴不同的鈍化 結構，去改善表面的傷害，降低缺陷，再搭配蜂巢詴之結構，就能提高太陽能電池之 效率。
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第五章
結論與未來展望
結論
雷射表面粗糙化之太陽能電池 Jsc 可達到 37.6 mA/cm2、Voc 達到 555mV、F.F 達到 0.668、效率可達到 13.9%。但是與標準電池之效率相比還是有些落差，因為要 做到高效能的太陽電池，必須兼顧到好的表面粗糙化，減少太陽光之反射，增加入射 光的吸收，達到提升 Jsc 的效果，並且要有良好的鈍化效果，減少表面缺陷，減少電 子電洞對被複合，提升 Voc，這樣才能有效的提升太陽能電池之轉換效率，現在蜂巢 式表面結構有良好的反射率，Jsc 也提升了 0.1mA/cm2，相信只要解決鈍化的問題，
電流與效率都能在進一步的提升。
未來方向:
以實驗提供幾個未來的方向:
1. 使用綠光雷射，降低孔洞之大小，達到良好之深寬比，藉此提升短路電流，也降 低對開路電壓之影響，維持較好之 Voc。
2. 留金屬電極線寬，降低接觸電阻，藉此提升短路電流。
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