臺灣博碩士論文加值系統

本論文中，我們研究以化合物半導體為基礎的太陽能電池。在單接面太陽能電池中，我們探討窗層配合蝕刻技術形成網狀窗對於元件的影響，得知網狀窗不僅增加光吸收效率，而且減少串聯電阻，可見網狀窗對於太陽能電池為其重要因素。
在多重接面中，我們也分別製作出單接面、雙重接面、三重接面太陽能電池，在one sun模擬光源照射下單接面、雙重接面、三重接面的效率與填充因子分別為3.11%、10.95%、18.78% 與0.534、0.771、0.803，並分析各接面對於太陽能電池之影響。為了探討在聚光下對於元件所造成的影響，我們對指狀電極遮蔽率(5.53%、6.61%、6.66%)及熱蒸鍍電極之厚度(0.2 μm、2.5 μm、3 μm)作特性分析。
最後，我們探討穿隧二極體電阻效應，以及雙重接面、三重接面在未照光之下，對於溫度由300 K升至353 K所造成元件特性之影響。

In this thesis, we study compound semiconductor based and concentrator solar cells. The GaAs solar cells with different window shape were successfully fabricated. The window layer affects both the optical absorption efficiency and the series resistance seriously.
In the multi-junction solar cells, we have successfully fabricated and investigated single-junction, double-junction and triple-junction solar cells. The measured conversion efficiency (η) and fill factor (FF) are 3.11, 10.95, 18.78% and 0.534, 0.771, 0.803, respectively. In order to investigate how concentration-light influent the device does, the shading loss (5.53, 6.61, 6.66%) and the thermal evaporation (0.2, 2.5, 3μm) were measured and analyses.
Finally, we have successfully fabricated and investigated the double-junction and triple-junction solar cells as well as the tunnel diodes. Furthermore, temperature characteristics of the open-circuit voltage were investigated within the range from 300 K to 353 K. In addition, temperature affects the series resistances (Rs) of the tunnel diode.

ABSTRACT Ⅲ
TABLE CAPTIONS Ⅴ
FIGURE CAPTIONS Ⅵ

Chapter 1. Introduction 1

Chapter 2. Effects of Window Layer on GaAs-based Solar Cell
2-1 Introduction 4
2-2 Device Structure and Fabrication 6
2-3 Experimental Results and Discussion 11
2-3-1 Effects of Surface Quality 12
2-3-2 Characteristics of the Open-Circuit Voltage 12
2-3-3 Series Resistance Effect 13
2-3-4 Conversion Efficiency and Output Power Density 14
2-4 Summary 17

Chapter 3. Performance of Sub-Cells in Triple-Junction Solar Cell
3-1 Introduction 18
3-2 Device Structure and Fabrication 19
3-2-1 Fabrication of Triple-Junction Solar Cell 22
3-2-2 Fabrication of Top Diode 25
3-2-3 Fabrication of Double-Junction Solar Cell 26
3-2-4 Fabrication of Middle Diode 29
3-2-5 Fabrication of Single-Junction Solar Cell and Bottom Diode 30
3-3 Experimental Results and Discussion 31
3-3-1 Performance of Triple-Junction Solar Cell 31
3-3-2 Performance of Double-Junction Solar Cell 33
3-3-3 Performance of Single-Junction Solar Cell and Bottom Diode 34
3-3-4 Performance of Middle Diode and Top Diode 35
3-4 Summary 37

Chapter 4. Characteristics of Concentrator Triple-Junction Solar Cell
4-1 Introduction 38
4-2 Device Structure and Fabrication 39
4-2-1 Fabrication of Triple Junction Solar Cell 41
4-2-2 Fabrication of Double Junction Solar Cell 44
4-3 Experimental Results and Discussion 47
4-3-1 Characteristics of Triple-Junction Solar Cell under Concentration 47
4-3-2 Characteristics of Double-Junction Solar Cell under Concentration 55
4-3-3 Temperature Characteristics of the Triple-Junction and Double-Junction Solar cell 61
4-3-4 Temperature Characteristics of the Tunnel Diodes 63
4-4 Summary 65

Chapter 5. Conclusion and Prospect
5-1 Conclusion 66
5-2 Prospect 67
References 68
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