含氫矽薄膜太陽電池材料之光電特性研究

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姓名

林宏儒(Hung-Ju Lin) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

含氫矽薄膜太陽電池材料之光電特性研究
(Photonic and Electric Properties of Hydrogenated Silicon Thin Films)

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摘要(中)

本研究針對太陽能電池之本質矽薄膜層，其製程係以物理氣相沉積法之
脈衝直流磁控濺鍍系統，在不同通氫量條件下製備，並觀察分析和討論其
光電特性，如光學吸收係數、光學能隙、膜內矽氫及矽氧鍵結、氫原子含
量比例及材料的光學常數等，且分析不同通氫量製鍍條件之下對於光電特
性的影響。
由於矽薄膜有明顯光學干涉現象，在光學吸收係數的分析上易受干擾，
因此引入多光束干涉的理論做相關吸收係數的模擬，以求得近似實際吸收
係數的值。另外，本論文探討含氫矽薄膜材料之光學能隙的大小，在非晶
態時，隨通氫量增加而增加，經分析發現內部孔隙產生的結構改變是造成
上述結果的可能原因。而在分析矽薄膜材料於近紅外區的吸收趨勢，我們
架設一套常數光電流量測系統，來量測並分析薄膜中關於缺陷影響及能隙
等重要訊息，如非晶矽的缺陷密度特性以及微晶態的實際能隙值之求得，
並將以上結果做相關的比較和分析。

摘要(英)

In this article, we discuss our research regarding the intrinsic layer of solar
cells. In this study we utilized pulsed DC magnetron sputtering for the PVD
fabrication process as this was the more environmentally sound method. We
looked at the relationship between the photonic properties and the hydrogen
flow adjusting the amount of hydrogen flow. For example, the absorption
coefficient of the materials, optical band gap, optical constants, bonding
characteristics and even the percentage of hydrogen atom in the thin films were
all subjects of interest.
Due to interference effect in silicon thin film, we applied the multiple-beam
interference theory into simulations for getting the nearly realistic absorption
coefficients. Then we not only obtained optical absorption coefficients that were
quite close to their actual value, but also gave attention to and discussed some
theoretical reasons regarding the optical band gap shifting results. For example,
silicon during in amorphous type had the increasing optical band gap when
raising hydrogen flow. And we deduced the possible reason that structural
variation of silicon thin film affected by voids. Moreover, we set up a system
using the constant photocurrent method to analyze the absorption trend of the
intrinsic silicon thin film in the infrared region. Additionally we discussed
important analyses and comparisons regarding the effects of potential defects
and the optical band gap of silicon film as a whole as shown by the measuring
system, for example, defect density of amorphous silicon film and actual optical
band gap of microcrystalline silicon film would also be realized via the method.

關鍵字(中)

★ 常數光電流量測
★ 光電特性
★ 含氫矽薄膜材料

關鍵字(英)

★ constant photocurrent method
★ Hydrogenated silicon thin film
★ Photonic and electric properties

論文目次

Contents
摘要..I
Abstract..II
Table of Contents..III
Figures..VI
Tables..IX
Chapter1 Introduction..1
1-1 Preface..1
1-2 Literature review..2
1-3 Research motivation..3
Chapter2 Basic Theories and Concepts..4
2-1 Development and historical costs of silicon solar cells..4
2-1-1 Theorem of photoelectric transformation..6
2-1-2 Potential of silicon thin film solar cells..7
2-1-3 Hydrogenated silicon thin film solar cells..8
2-2 Optical absorption and absorption coefficient..9
2-2-1 Absorption coefficient from transmittance..10
2-2-2 Interference-free absorption coefficient theory..10
2-3 About the optical band gap..12
2-3-1 Meaning and applications..12
2-3-2 Mechanisms for direct and indirect transitions..13
2-3-3 Analyzing models of the optical band gap..15
Chapter 3 Experimental Instruments and Methods..16
3-1 Fabrication technique instruments-DC pulse magnetron sputtering..16
3-2 Analytical instruments..17
3-2-1 HITACH U-4100 Spectrophotometer..17
3-2-2 Fourier Transform Infrared Spectroscopy (FTIR)..18
3-2-3 Raman Spectroscopy..19
3-2-4 Spectroscopic Ellipsometry..20
3-3 Constant Photocurrent Method (CPM)..21
3-3-1 Operating methods and applications..21
3-3-2 System frame and related components..22
3-4 Experimental steps and methods..23
Chapter 4 Experimental Results and Discussion..26
4-1 Analyses of the absorption coefficients of intrinsic silicon films..26
4-1-1 Absorption coefficients measured from the transmittance..26
4-1-2 Simulations and comparisons of interference-free absorption coefficients..27
4-1-3 Comparison of different amounts of hydrogen flow versus the absorption coefficient of the materials..33
4-2 Discussion of the optical band gaps of intrinsic silicon films..35
4-2-1 Analysis of the optical band gaps by the Tauc method..36
4-2-2 Analysis of the optical band gaps by the Klazes method..37
4-2-3 Comprehensive discussion and analyses..40
4-3 Fourier- transformed infrared transmittance spectroscopic analysis..41
4-3-1 Characteristics of the silicon to hydrogen bonds..41
4-3-2 Effect of the silicon to oxygen bonds at the film surface..43
4-4 Analyses of the ratio of crystallinity by Raman Spectroscopy..44
4-5 Analyses of the percentage of hydrogen atoms in silicon films..45
4-6 Analyses of refractive indices through ellipsometry..46
4-6-1 Changing the refractive indices by varying the hydrogen flow..47
4-6-2 Analysis and discussion of the refractive indices at specific wavelengths..49
4-7 Analysis of silicon thin films via the CPM system..52
4-7-1 Relative absorption capacity of silicon thin films..53
4-7-2 Analyses of optical band gaps in hydrogenated silicon films..57
1. Analyses of optical band gaps via a spectrometer..57
2. Analyses of optical band gaps via the CPM system..59
Chapter5 Conclusions..62
Future Work..65
References..66

參考文獻

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指導教授

陳昇暉、李正中
(Sheng-Hui Chen、Cheng-Chung Lee)

審核日期

2008-7-10

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