非晶質吸光區與累增區分離之類超晶格累崩光二極體

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邱俊智(Chun-Chih Chiu) 查詢紙本館藏

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論文名稱

非晶質吸光區與累增區分離之類超晶格累崩光二極體
(Amorphous Separated Absorption and Multiplication Superlattice-like Avalanche Photodiodes(Amorphous SAM-SAPD’s))

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摘要(中)

摘要
本論文的研究主題是探討及比較在非晶質類超晶格（superlattice-like）結構的累增區中，分別加入p-n (a-SiC)、p-i-n (a-SiC)或p-i(a-SiC)-i-n(a-Si)非晶質複層的各種非晶質吸光區累增區分離的類超晶格累崩光二極體(非晶質SAM-SAPD)的主要光電特性，例如：光/暗電流曲線，光增益，發射雜訊，及過剩雜訊因子等等。這些元件都有相當高的光增益，但其中以加入p-i(a-SiC)-i-n(a-Si)非晶質複層的元件具有最高的光增益與最低的過剩雜訊。這些實驗結果顯示提高累增區中的電場及利用適當的能隙帶不連續性可使元件具有較佳的光電特性。

摘要(英)

Abstract
In this study, several kinds of amorphous separated absorption and multiplication superlattice-like avalanche photodiode (amorphous SAM-SAPD), each with additional p-n (a-SiC), p-i-n (a-SiC), or p-i(a-SiC)-i-n(a-Si) amorphous silicon-alloy layers in substage of superlattice (SL) for multiplication, had been designed and fabricated successfully. Also their characteristics such as dark and photo I/V curves, optical gains, relative spectral responses, shot noises and excess noise factors had been systematically measured, calculated, and compared. All of these devices had rather high optical gain, and the device with the additional p-i(a-SiC)-i-n(a-Si) amorphous layers in substage of SL(named Device C) had the highest optical gain and the lowest excess noise. These results indicated that using high electric-field and proper band-edge discontinuity in the multiplication region of a SAM-SAPD could improve the device optical gain and excess noise simultaneously.

關鍵字(中)

★ 光偵測器
★ 超晶格
★ 雪崩
★ 累增
★ 累崩
★ 非晶質
★ 光二極體

關鍵字(英)

★ amorphous
★ avalanche
★ SAM-APD
★ photodoide
★ multiplication

論文目次

Contents
Abstract …………………………………………………………………I
Table Captions …………………………………………………………IV
Figure Captions …………………………………………………………V
Chapter 1 Introduction………………………………………………1
Chapter 2 Brief Theory of Amorphous Separated Absorption
and Multiplication Superlattice-like Avalanche Photodiode
(SAM-SAPD) …………………………………………………………………4
2.1 Current transport …………………………………………………4
2.2 Optical gain ………………………………………………………11
2.3 Quantum efficiency………………………………………………12
2.4 Impact ionization coefficients ………………………………12
2.5 Shot noise and Excess noise factor …………………………14
Chapter 3 Design, Fabrication, and Measurement of
Amorphous (SAM-SAPD's) ………………………………………………19
3.1 Design Considerations ……………………………………………19
3.1.1 High gain…………………………………………………………19
3.1.2 Low excess noise …………………………………………………19
3.1.3 High absorption coefficient …………………………………21
3.2 Fabrication Processes ……………………………………………21
3.2.1 Comparison of several proposed SAM-SAPD
structures ……………………………………………………………21
3.2.2 Fabrication Processes ………………………………………22
3.3 Measurement Techniques ………………………………………34
3.3.1 Optical band-gap ……………………………………………34
3.3.2 Spectral response……………………………………………34
3.3.3 Shot noise and Excess noise factor………………………38
Chapter 4 Experimental Results and Discussion ……………41
4.1 Spectral response ……………………………………………41
4.2 Dark/photo I/V curves and optical gain ……………………44
4.2.1 Comparison of Devices A, B, and C ………………………44
4.2.2 Comparison of Device C, D, 2C(SL*2), and
3C(SL*3) ………………………………………………………………52
4.3 Shot noise & excess noise factor …………………………57
Chapter 5 Conclusion ……………………………………………66
References ……………………………………………………………67

參考文獻

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指導教授

洪志旺(Jyh-Wong Hong)

審核日期

2004-6-23

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