不同陽極蝕刻深度之氮化鋁鎵/氮化鎵蕭特基二極體特性分析

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范姜少琪(Shao-Chi Fan Jiang) 查詢紙本館藏

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電機工程學系

論文名稱

不同陽極蝕刻深度之氮化鋁鎵/氮化鎵蕭特基二極體特性分析

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摘要(中)

本論文主要針對在矽(111)基板上製作不同陽極蝕刻深度之氮化鋁鎵/氮化鎵蕭特基二極體。一般蕭特基二極體為了降低開關過程中的損耗，降低臨界電壓與保持低的漏電流是相當重要的議題，而本論文將針對降低開啟電壓進行研究。首先，利用TCAD的模擬分析無陽極蝕刻(Device A)、陽極蝕刻深度至AlGaN位障層(Device B)、陽極蝕刻深度超過2DEG介面之蕭特基二極體基本電性。接著探討其製程後的特性表現，利用室溫下的電容-電壓的量測曲線，分析不同陽極蝕刻深度與通道中的2DEG濃度關聯性，以及室溫下順向、逆向電流-電壓特性分析。當陽極蝕刻深度至AlGaN位障層，其臨界電壓(VT )為1.05 V，且藉由陽極端金屬的T型設計分散邊緣的電場，而有較高的崩潰電壓480 V。當陽極蝕刻深度超過2DEG介面，其臨界電壓(VT )達到最低0.75 V。
也利用變溫來探討氮化鋁鎵/氮化鎵蕭特基二極體順向偏壓及逆向偏壓下的特性，在順向偏壓下藉由不均勻能障模型來計算蕭特基能障，估算蒸鍍金屬後的蕭特基接觸有不均勻的接面。而逆向電流-電壓曲線可以進一步分析漏電流機制，因低溫下缺陷中之載子不易產生變化，而在高溫下載子就容易因為溫度的關係而從缺陷中逃脫。量測得知，漏電流皆會隨著電場和溫度而變化，而在較高逆偏壓下漏電流則與溫度無相依性，而是與電場相關，此種漏電流受溫度及電場影響之電流機制為Frenkel–Poole emission。其中Device B有較大的漏電流，推測原因可能是由於蝕刻後表面不平整及缺陷而造成較大的漏電流，其缺陷能階估算位在導電帶下方0.03 eV。但在Device A中，其缺陷能階估算位在導電帶下方1.19 eV，因只有表面Si3N4的蝕刻導致缺陷的原因不同。

摘要(英)

GaN-based heterostructure lateral Schottky barrier diodes (SBDs) grown on Silicon (111) substrate with various recess depths are investigated in this study. Conduction losses in onset voltage and reverse-bias leakage result in significant limitations to power switching performance of Schottky diodes. First of all, Silvaco TCAD was used to simulate the electrical properties of Schottky barrier diodes with various recess depths. Three diode structures are investigated, Device A is the SBD without recess in AlGaN layer, Device B is the SBD with a 20-nm recess depth in AlGaN layer (1.6 nm left) and Device C is the SBD with whole AlGaN layer removed and recessed to GaN layer. After SBD fabrication, both C-V and I-V characteristics at room temperature are analyzed. The results reveal that Device B shows threshold voltage (VT) of 1.05 V and reverse blocking voltage of 480 V. The SBD with recess through AlGaN to GaN layer demonstrates the lowest VT of 0.75 V.
Furthermore, temperature dependence of forward and reverse current-voltage characteristics of AlGaN/GaN SBDs are investigated. In forward bias condition, considering the alloy composition fluctuations inherent to low-temperature III-N alloys which results in a Schottky barrier height inhomogeneity, and that the Schottky barrier height follows a Gaussian distribution. By observing the reverse bias leakage current flow, it is possible to find the defect energy levels in AlGaN barrier are quantified by the leakage current model of Frenkel-Poole emission. Frenkel-Poole emission refers to electric-field-enhanced thermal emission from a trap state into a continuum of electronic states. Device B has larger leakage current due to stronger surface roughness (damages) that the trap state to be located 0.03 eV below the conduction-band edge. In the Device A, due to the in-situ SiN was removed before gate metallization that the trap state to be located 1.19 eV below the conduction-band edge.

關鍵字(中)

★ 氮化鋁鎵/氮化鎵
★ 蕭特基二極體
★ 陽極蝕刻

關鍵字(英)

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 X
第一章緒論 1
1.1 前言 1
1.2 氮化鎵蕭特基二極體市場發展與應用 3
1.3 氮化鎵蕭特基二極體國內外相關研究成果 5
1.4 研究動機與目的 18
1.5 論文架構 19
第二章氮化鋁鎵/氮化鎵蕭特基二極體於矽基板上之結構設計及元件模擬分析 20
2.1 前言 20
2.2氮化鋁鎵/氮化鎵於矽基板之磊晶結構與材料分析 20
2.3氮化鋁鎵/氮化鎵蕭特基二極體於矽基板之元件製作 26
2.4氮化鋁鎵/氮化鎵蕭特基二極體之元件特性模擬 30
2.5結論 34
第三章氮化鋁鎵/氮化鎵蕭特基二極體室溫之電性量測與分析 35
3.1前言 35
3.2氮化鋁鎵/氮化鎵蕭特基二極體之電容-電壓特性分析 35
3.3氮化鋁鎵/氮化鎵蕭特基二極體之電流-電壓特性分析 43
3.3.1 氮化鋁鎵/氮化鎵蕭特基二極體順向導通特性 43
3.3.2氮化鋁鎵/氮化鎵蕭特基二極體逆向崩潰特性 53
3.4結論 57
第四章氮化鋁鎵/氮化鎵蕭特基二極體變溫之電性量測與分析 58
4.1前言 58
4.2氮化鋁鎵/氮化鎵蕭特基二極體變溫萃取蕭特基能障 58
4.3氮化鋁鎵/氮化鎵蕭特基二極體逆向漏電流分析 68
4.4結論 74
第五章結論與未來展望 75
5.1結論 75
5.2未來展望 76
參考文獻 77
附錄I -氮化鋁鎵/氮化鎵蕭特基二極體與高電子遷移率電晶體製作流程 81
附錄II -氮化鋁鎵/氮化鎵高電子遷移率電晶體直流特性 85

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指導教授

辛裕明(Yue-Ming Hsin)

審核日期

2018-8-6

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