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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳俊維(Chun-Wei Chen) | |
| dc.contributor.author | Wei-Jung Lai | en |
| dc.contributor.author | 賴韋仲 | zh_TW |
| dc.date.accessioned | 2021-06-08T05:06:36Z | - |
| dc.date.copyright | 2011-07-07 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-07-04 | |
| dc.identifier.citation | Chap1
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/23637 | - |
| dc.description.abstract | 本論文目的，主要係探討利用低維度氮化銦材料與導電高分子以形成異質接面，並以此接面作為近紅外線偵測器的應用與電荷分離之機制研究。其中，低維度氮化銦材料包括一維奈米材料與薄膜材料，亦將界定出這些不同奈米結構的成長視窗，並參考文獻探討可能之成長機制。
本論文利用有機金屬化學氣相沉積方法來合成氮化銦奈米結構，並使用氣相-液相-固相成長機制來闡釋其形成的原因，而其中包含了液態合金催化劑擴散以及表面擴散兩種成長機制。此外，在金屬-氮化銦與導電高分子-氮化銦接面進行光電流與光反應量測，由光反應的靈敏來探討其元件的缺失；同時，使用靜態與動態螢光光譜來解析在異質接面發生的電荷分離現象，並更進一步利用電容-電壓量測來模擬出導電高分子的位能分佈，以找出電荷分離的機制。 因液態合金催化劑之擴散機制，使合金催化劑的大小決定了奈米線半徑大小；相對地，奈米柱呈現半徑逐漸縮小的現象，而這可以歸因於表面擴散的成長機制所導致。藉由與薄膜材料的活化能比對，可以發現一維奈米材料與薄膜材料均係呈現平面式成長，並且，對照奈米線與奈米柱的成長速率，本論文發現奈米柱需要較長時間來進行奈米結構初始成長。 由光電流產生在金屬-氮化銦接面研究可知，表面氧化層會抑制光電流產生；此外，光電流在導電高分子-氮化銦接面可以因此而增大，然而，於低偏壓下，由於熱游離電子使得此異質接面無法形成明顯的驅動電壓。本論文亦發現，由於氮化銦表面具有表面電荷累積，使得表面具有很強的內建電場，故造成導電高分子位能重新分佈導致電荷分離。 本論文認為，如何有效地降低氮化銦的載子濃度，並藉由表面修飾方法以控制表面位能彎曲程度，將會是未來影響氮化銦元件發展的關鍵。 | zh_TW |
| dc.description.abstract | The aim of this thesis is to form the heterojunction based on low-dimensional indium nitride and conducting polymer. A number of studies have been done to investigate the near infrared photodetector and the mechanism of charge separation using this hetero-junction. This thesis, by reference to the relevant literature, defines the growth windows of different nanostructures, including one-dimensional nanostructures and thin films. Possible growth mechanisms are also considered thoroughly.
In this thesis, the low-dimensional indium nitride is synthesized by using metal-organic chemical vapor deposition and vapor-liquid-solid growth mechanism, including liquid alloy and surface diffusion. The photocurrent and photoresponse measurement are performed in the junctions of metal/indium nitride, and conducting polymer/indium nitride. The potential application of the devices is evaluated by measuring the photoresponse sensitivity. Meanwhile, this thesis analyzes the phenomenon of charge separation by using static and dynamic photoluminescence spectroscopy. Potential distribution in conducting polymer is then modeled according to capacitance-voltage measurement. Because of liquid alloy diffusion, the diameter of nanowire is determined by alloy droplet. By contrast, the phenomenon of nanorod tapering can be attributed to surface diffusion. According to activation energy, the one-dimensional nanostructures follow planar growth, which is the same as the case for thin films. Also, the initial growth time of nanorod is longer than that of nanowire in accordance with growth rate. Thus, photocurrent will be suppressed by surface oxide layer based on the studies of photocurrent generation in metal/indium nitride. In addition, due to the junction between conducting polymer and indium nitride, photocurrent will be enhanced. However, in lower bias condition, the current-voltage curve does not show apparent built-in potential because of thermionic emission mechanism. Because the surface accumulation layer exists in indium nitride which results in strong built-in electrical field, it induces potential rearrangement in conducting polymer for charge separation. To conclude, this thesis argues that, to decrease the carrier concentration of indium nitride and control the magnitude of surface band bending would be indispensable for development of InN-based devices in future. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T05:06:36Z (GMT). No. of bitstreams: 1 ntu-100-F92527032-1.pdf: 5641810 bytes, checksum: 43df831e24eac2931b4d639497e81bc1 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 1 Introduction 1
1-1 Motivation 2 1-1-1 III-nitrides semiconductors 2 1-1-2 Indium nitride (InN) 3 1-2 Physical properties of InN 8 1-2-1 Burstein-Moss effect 11 1-2-2 Downward surface band bending 17 1-3 Overview of MOCVD grown InN thin films 20 1-4 Overview of CVD grown InN nanowires 23 1-5 Abbreviation 27 References 28 2 Principles of optical measurements in InN 37 2-1 Optical properties of InN 38 2-1-1 Raman scattering 38 2-1-2 Optical absorption 41 2-2 Optical characterization tools 45 2-2-1 Micro-Raman Spectroscopy 45 2-2-2 Macro photoluminescence (PL) spectroscopy 48 2-2-3 Absorption spectroscopy 51 References 53 3 Crystal growth and design of low-dimensional InN by MOCVD 57 3-1 The principle of MOCVD 58 3-2 InN 1D nanostructure growth mediated by gold catalyst 61 3-2-1 Silicon substrate 63 3-2-2 Indium Tin Oxide substrate 80 3-2-3 Gallium nitride (GaN) substrate 86 3-3 InN thin films growth 88 References 92 4 Photocurrent generation in InN and related heterojunction with P3HT 95 4-1 Device physics of photodetectors 96 4-2 MSM structure of InN NWs 98 4-3 InN NRs and poly(3-hexylthiophene) heterojunction 101 References 108 5 The exploration of charge separation in P3HT/InN bilayer structure 111 5-1 Electrical characterizations of polymer electronic devices 112 5-2 Surface induced charge separation in the interface 116 References 129 Conclusion 133 | |
| dc.language.iso | en | |
| dc.title | 低維度氮化銦:成長視窗及導電高分子異質接面 | zh_TW |
| dc.title | Low-Dimensional Indium Nitride:
Growth Window and Heterojunction with Conducting Polymer | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 陳貴賢(Kuei-Hsien Chen),林麗瓊(Li-Chyong Chen),吳季珍(Jih-Jen Wu),陳瑞山(Reui-San Chen) | |
| dc.subject.keyword | 氮化銦,導電高分子,異質接面,光偵測器,奈米線, | zh_TW |
| dc.subject.keyword | indium nitride,P3HT,heterojunction,photodetector,nanowire, | en |
| dc.relation.page | 135 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2011-07-04 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
| 顯示於系所單位： | 材料科學與工程學系 | |
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