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Electrical, Photoconductive, and Thermal Studies of Diamond, an Ultrawide-Bandgap Semiconductor for Power Electronics
Electrical, Photoconductive, and Thermal Studies of Diamond, an Ultrawide-Bandgap Semicond...
Electrical, Photoconductive, and Thermal Studies of Diamond, an Ultrawide-Bandgap Semiconductor for Power Electronics

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자료유형  
 학위논문 서양
최종처리일시  
20250211153059
ISBN  
9798346391142
DDC  
621.795
저자명  
Woo, Kelly Yi-Li.
서명/저자  
Electrical, Photoconductive, and Thermal Studies of Diamond, an Ultrawide-Bandgap Semiconductor for Power Electronics
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
155 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Chowdhury, Srabanti.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약Silicon-based electronic devices are constrained in their maximum operational voltage due to silicon's low breakdown field. Additionally, silicon's narrow band gap of 1.12 eV restricts their operating temperature range, as thermally generated carriers can degrade performance even at moderate temperatures. To address these challenges, researchers have turned to wide-bandgap materials, which exhibit superior performance in high power and high-frequency applications, as well as in extreme environments. Diamond, with an ultrawide-bandgap of approximately 5.45 eV, offers exceptional physical and electrical properties, including high electron-hole mobilities, a high breakdown electric field, and high thermal conductivity. These attributes make diamond a promising material for efficient semiconductor devices capable of operating at higher voltages than conventional wide-bandgap materials. This thesis evaluates diamond's performance in three areas relevant to power electronics: as a conventional electronic power device, its potential for optical triggering, and its application as a heat spreader for other semiconductor technologies.First, the controllability of the Schottky barrier height (SBH) of diamond Schottky barrier diodes and its effects on device performance were electrically evaluated, with UV-ozone treatment used to increase electron affinity and tune the SBH. This has significant impact on the reverse leakage and threshold voltage of diodes. Forward bias I-V measurements showed precise control of SBH from 1.35 eV to 1.98 eV, although high-temperature anneals consistently decreased the apparent SBH, with longer UV-ozone treatments leading to greater barrier inhomogeneity.For high voltage applications, the use of optical triggers enable safer and more reliable mechanisms for making and breaking circuits. Various diamond structures for extrinsic photoconductive semiconductor switches (PCSS) were investigated, with nitrogen-doped PCSS showing the highest on/off-state current ratio on the order of 1012with 532 nm pulses, while only the CVD-grown boron-doped epilayer and boron-implanted IIa devices were sensitive to 1064 nm. Device performances up to 500 V were demonstrated with responsivity as good as those of GaN and SiC PCSSs.Finally, in using diamond as a heat spreader in thermal engineering, a bottleneck of heat transport lies in the thermal resistance at the interface between the diamond and the semiconductor substrate. Interface engineering between diamond and GaN, and diamond and Si was demonstrated to achieve record-low thermal boundary resistances, facilitating more efficient thermal transport of heat away from the device channel.
일반주제명  
Etching
일반주제명  
Boron
일반주제명  
Diodes
일반주제명  
Energy
일반주제명  
Lasers
일반주제명  
Carbon
일반주제명  
Electric fields
일반주제명  
High temperature
일반주제명  
Nitrogen
일반주제명  
Annealing
일반주제명  
Electromagnetics
일반주제명  
High temperature physics
일반주제명  
Optics
일반주제명  
Thermodynamics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■020    ▼a9798346391142
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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a621.795
■1001  ▼aWoo,  Kelly  Yi-Li.
■24510▼aElectrical,  Photoconductive,  and  Thermal  Studies  of  Diamond,  an  Ultrawide-Bandgap  Semiconductor  for  Power  Electronics
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a155  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Chowdhury,  Srabanti.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aSilicon-based  electronic  devices  are  constrained  in  their  maximum  operational  voltage  due  to  silicon's  low  breakdown  field.  Additionally,  silicon's  narrow  band  gap  of  1.12  eV  restricts  their  operating  temperature  range,  as  thermally  generated  carriers  can  degrade  performance  even  at  moderate  temperatures.  To  address  these  challenges,  researchers  have  turned  to  wide-bandgap  materials,  which  exhibit  superior  performance  in  high  power  and  high-frequency  applications,  as  well  as  in  extreme  environments.  Diamond,  with  an  ultrawide-bandgap  of  approximately  5.45  eV,  offers  exceptional  physical  and  electrical  properties,  including  high  electron-hole  mobilities,  a  high  breakdown  electric  field,  and  high  thermal  conductivity.  These  attributes  make  diamond  a  promising  material  for  efficient  semiconductor  devices  capable  of  operating  at  higher  voltages  than  conventional  wide-bandgap  materials.  This  thesis  evaluates  diamond's  performance  in  three  areas  relevant  to  power  electronics:  as  a  conventional  electronic  power  device,  its  potential  for  optical  triggering,  and  its  application  as  a  heat  spreader  for  other  semiconductor  technologies.First,  the  controllability  of  the  Schottky  barrier  height  (SBH)  of  diamond  Schottky  barrier  diodes  and  its  effects  on  device  performance  were  electrically  evaluated,  with  UV-ozone  treatment  used  to  increase  electron  affinity  and  tune  the  SBH.  This  has  significant  impact  on  the  reverse  leakage  and  threshold  voltage  of  diodes.  Forward  bias  I-V  measurements  showed  precise  control  of  SBH  from  1.35  eV  to  1.98  eV,  although  high-temperature  anneals  consistently  decreased  the  apparent  SBH,  with  longer  UV-ozone  treatments  leading  to  greater  barrier  inhomogeneity.For  high  voltage  applications,  the  use  of  optical  triggers  enable  safer  and  more  reliable  mechanisms  for  making  and  breaking  circuits.  Various  diamond  structures  for  extrinsic  photoconductive  semiconductor  switches  (PCSS)  were  investigated,  with  nitrogen-doped  PCSS  showing  the  highest  on/off-state  current  ratio  on  the  order  of  1012with  532  nm  pulses,  while  only  the  CVD-grown  boron-doped  epilayer  and  boron-implanted  IIa  devices  were  sensitive  to  1064  nm.  Device  performances  up  to  500  V  were  demonstrated  with  responsivity  as  good  as  those  of  GaN  and  SiC  PCSSs.Finally,  in  using  diamond  as  a  heat  spreader  in  thermal  engineering,  a  bottleneck  of  heat  transport  lies  in  the  thermal  resistance  at  the  interface  between  the  diamond  and  the  semiconductor  substrate.  Interface  engineering  between  diamond  and  GaN,  and  diamond  and  Si  was  demonstrated  to  achieve  record-low  thermal  boundary  resistances,  facilitating  more  efficient  thermal  transport  of  heat  away  from  the  device  channel.
■590    ▼aSchool  code:  0212.
■650  4▼aEtching
■650  4▼aBoron
■650  4▼aDiodes
■650  4▼aEnergy
■650  4▼aLasers
■650  4▼aCarbon
■650  4▼aElectric  fields
■650  4▼aHigh  temperature
■650  4▼aNitrogen
■650  4▼aAnnealing
■650  4▼aElectromagnetics
■650  4▼aHigh  temperature  physics
■650  4▼aOptics
■650  4▼aThermodynamics
■690    ▼a0791
■690    ▼a0607
■690    ▼a0597
■690    ▼a0752
■690    ▼a0348
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164891▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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