臺灣博碩士論文加值系統

本篇論文是對具有本質薄膜層之異質接面(HIT)太陽電池結構進行研究，我們使用模擬軟體Santarus TCAD，參考許多文獻，不斷修正我們的模型，使得效率、開路電壓、短路電流等模擬值貼近文獻。接著，對我們欲研究了解之HIT太陽電池頂部本質層以及塊材厚度變化影響進行模擬研究，我們亦研究材料厚度對HIT光偵測器的影響。
模擬主要分為兩個部分，第一部分是研究p-type矽晶圓之HIT太陽電池結構，先固定塊材厚度在250μm之下，藉由調整頂部本質層厚度，來優化p-type矽晶圓之HIT太陽電池效率，結果顯示，此本質層厚度為40nm時，效率可達到最佳化。另外，我們亦優化塊材在1.5μm厚度下之HIT結構，效率亦是在本質層厚度為40nm時達到最佳化。第二部分是將 Sanyo公司之 n-type矽晶圓的HIT太陽電池結構運用在光偵測器上，模擬時入射光頻譜由原來模擬太陽電池之全波段調整為欲將偵測之可見光以及近紅外光波段，我們亦試圖優化各波段所對應塊材厚度以及頂部本質層厚度之響應度值，結果顯示欲偵測之各個波段所需優化之結構厚度不盡相同，所以應視偵測波段的需求來選擇適當的厚度。

In this thesis, we have investigated the structure of HIT (hetero-junction with intrinsic thin-layer) for solar cells and photodetectors. We consulted many references and corrected our models to obtain the most reasonable efficiency, Voc and Isc. Then, we looked into the influence of the thickness of the top intrinsic hydrogenated amorphous Si (a-Si:H(i)) layer or bulk crystalline Si(c-Si) on p-type Si HIT solar cells. We also studied the thickness effect on the photodetectors with the HIT structure. The research was done by the simulation tool, Santarus TCAD.
The study is divided into two parts：
1. We investigated the HIT solar cell structure on the p-type c-Si wafer. First, we fixed the thickness of bulk c-Si at 250 μm, and then we optimized the thickness of the top a-Si:H(i). The results indicated that the efficiency was optimized with a 40-nm-thick a-Si:H(i) layer. We also optimized the structure with the bulk c-Si of 1.5 μm thick. The results indicated that the thickness of a-Si:H(i) layer is optimized with 40 nm as well.
2. We applied Sanyo’s HIT solar cell structure on the n-type c-Si wafer to photodetectors. The performance of HIT photodetectors at the representative wavelengths of visible and near-infrared light was investigated. We also optimized the thickness of bulk c-Si and a-Si:H(i) to get the larger responsivities. The results indicated that the different detection wavelengths need different thicknesses of materials.

Related Publication I
致謝 II
摘要 III
Abstract IV
Contents V
List of figure VI
List of table VII
Chapter 1 Introduction 1
1.1 Preface 1
1.2 Motivation 2
1.3 Thesis Overview 3
Chapter 2 Solar Cells 5
2.1 The Develpoment of Solar Cells 5
2.2 The Evolution of HIT Solar Cells 9
Chapter 3 Efficiency Improvement of HIT Solar Cells on p-type Si Wafers 17
3.1 Introduction 18
3.2 Device Structure 19
3.3 Results & Discussion 23
3.4 Summary 27
Chapter 4 Applications of the HIT Solar-Cell Structure on Photodetectors 29
4.1 Introduction 30
4.2 Device Structure 31
4.3 Results & Discussion 35
4.4 Summary 40
Chapter 5 Conclusion 43
Reference 45

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