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Alscn-Based Acoustic Resonators Utilizing Piezoelectric and Ferroelectric Effects
Alscn-Based Acoustic Resonators Utilizing Piezoelectric and Ferroelectric Effects
Alscn-Based Acoustic Resonators Utilizing Piezoelectric and Ferroelectric Effects

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105546
ISBN  
9798265405029
DDC  
620
저자명  
Wang, Jialin.
서명/저자  
Alscn-Based Acoustic Resonators Utilizing Piezoelectric and Ferroelectric Effects
발행사항  
[Sl] : Georgia Institute of Technology, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
142 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: A.
주기사항  
Advisor: Ansari, Azadeh.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
초록/해제  
요약The increasing consumer demand for high downloading speed and reliable communication channels has driven the development of the next-generation communication technologies, resulting in more complicated RF front-end modules with many integrated acoustic filters operating at much higher frequency ranges to avoid the overcrowded channels that are currently in use.This thesis focuses on the AlScN-based FBAR device due to its ability to scale up the resonant frequencies with high acoustic performance. Chapter 1 will state the motivation behind this research. Then, chapter 2 will introduce the acoustic performance of the sputtered AlScN-based FBAR and C-FBAR structure, demonstrating the first intrinsically switchable FBARs with one of the highest kt 2 (18.1%) reported to date at ~3 GHz. Next, the TCF and the voltage modulation of the resonant frequency of the FBARs are measured. Thanks to their wide bandgap, the FBARs demonstrate excellent high-temperature stability compared to other piezoelectric and ferroelectric materials.Chapter 3 will discuss the electrical and acoustic performance of the AlScN thin films and FBARs utilizing the ferroelectric behavior. Due to the intrinsic polarization switching ability and the permittivity modulation, ferroelectric materials show promising prospects as the material of choice for tunable/switchable resonators and tunable capacitors (varactors). Amongst popular ferroelectric materials, Aluminum Scandium Nitride (AlScN) acoustic devices have shown promising results for reconfigurable filter applications due to the simultaneous existence of excellent piezoelectric and ferroelectric properties. The fabricated FBARs show two operating states depending on the polarization of the AlScN thin film for the first time. The electrical properties of the AlScN-based metalferroelectric-meal (MFM) capacitors have also been demonstrated with polarizationdependent CV modulation and duo resistance states. In the future, the MFM capacitor will be used as a varactor to in tunable hybrid acoustic filters. Furthermore, the hightemperature electric and acoustic characterization of the AlScN devices is studied in Chapter 3. Here, the temperature dependence of the coercive field (-6.7kV/cmK) has been reported for the first time, showing a linearly decreasing trend. The DC frequency tunning of ~3% (-110V to +80V) is achieved at a high temperature 3 times higher than the room temperature. This chapter aims to understand the physics behind the FBAR switching mechanism and to fabricate sub-6GHz tunable hybrid filters.On the other hand, the evolution of the 5G market has pushed the research focus to FBARs operating in mmWave frequencies. Chapter 4 of this dissertation will focus on designing, fabricating, and characterizing the ultra-thin film FBARs operating between 18- 23GHz. The ultra-thin film used in this work has a fully epitaxial-grown resonating stack, resulting in not only a perfect single crystalline structure of the piezoelectric layer but also a perfect metal/piezoelectric contact, which improves the resonant device performance by removing the effect of thin oxide formed on top of the piezoelectric layer. This work also utilized a cascaded FBAR (cas-FBAR) structure that maximized the active area and improved the power handling capability of the fabricated devices, demonstrating one of the highest figure of merit (kt 2 x Q, FoM) FBAR devices at similar operating frequencies. Finally, chapter 5 concludes this thesis by proposing future directions toward optimizing the device.
일반주제명  
Random access memory
일반주제명  
Communication channels
일반주제명  
Radio frequency
일반주제명  
Residual stress
일반주제명  
High temperature
일반주제명  
Metal fatigue
일반주제명  
Etching
일반주제명  
Aluminum
일반주제명  
Design
일반주제명  
Lead
일반주제명  
Communications systems
일반주제명  
Acoustics
일반주제명  
Transistors
일반주제명  
Thin films
일반주제명  
Scanning electron microscopy
일반주제명  
Analytical chemistry
일반주제명  
Condensed matter physics
일반주제명  
Electrical engineering
일반주제명  
Materials science
일반주제명  
Thermodynamics
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05A.
전자적 위치 및 접속  
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MARC

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■0820  ▼a620
■1001  ▼aWang,  Jialin.
■24510▼aAlscn-Based  Acoustic  Resonators  Utilizing  Piezoelectric  and  Ferroelectric  Effects
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a142  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  A.
■500    ▼aAdvisor:  Ansari,  Azadeh.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2024.
■520    ▼aThe  increasing  consumer  demand  for  high  downloading  speed  and  reliable  communication  channels  has  driven  the  development  of  the  next-generation  communication  technologies,  resulting  in  more  complicated  RF  front-end  modules  with  many  integrated  acoustic  filters  operating  at  much  higher  frequency  ranges  to  avoid  the  overcrowded  channels  that  are  currently  in  use.This  thesis  focuses  on  the  AlScN-based  FBAR  device  due  to  its  ability  to  scale  up  the  resonant  frequencies  with  high  acoustic  performance.  Chapter  1  will  state  the  motivation  behind  this  research.  Then,  chapter  2  will  introduce  the  acoustic  performance  of  the  sputtered  AlScN-based  FBAR  and  C-FBAR  structure,  demonstrating  the  first  intrinsically  switchable  FBARs  with  one  of  the  highest  kt  2  (18.1%)  reported  to  date  at  ~3  GHz.  Next,  the  TCF  and  the  voltage  modulation  of  the  resonant  frequency  of  the  FBARs  are  measured.  Thanks  to  their  wide  bandgap,  the  FBARs  demonstrate  excellent  high-temperature  stability  compared  to  other  piezoelectric  and  ferroelectric  materials.Chapter  3  will  discuss  the  electrical  and  acoustic  performance  of  the  AlScN  thin  films  and  FBARs  utilizing  the  ferroelectric  behavior.  Due  to  the  intrinsic  polarization  switching  ability  and  the  permittivity  modulation,  ferroelectric  materials  show  promising  prospects  as  the  material  of  choice  for  tunable/switchable  resonators  and  tunable  capacitors  (varactors).  Amongst  popular  ferroelectric  materials,  Aluminum  Scandium  Nitride  (AlScN)  acoustic  devices  have  shown  promising  results  for  reconfigurable  filter  applications  due  to  the  simultaneous  existence  of  excellent  piezoelectric  and  ferroelectric  properties.  The  fabricated  FBARs  show  two  operating  states  depending  on  the  polarization  of  the  AlScN  thin  film  for  the  first  time.  The  electrical  properties  of  the  AlScN-based  metalferroelectric-meal  (MFM)  capacitors  have  also  been  demonstrated  with  polarizationdependent  CV  modulation  and  duo  resistance  states.  In  the  future,  the  MFM  capacitor  will  be  used  as  a  varactor  to  in  tunable  hybrid  acoustic  filters.  Furthermore,  the  hightemperature  electric  and  acoustic  characterization  of  the  AlScN  devices  is  studied  in  Chapter  3.  Here,  the  temperature  dependence  of  the  coercive  field  (-6.7kV/cmK)  has  been  reported  for  the  first  time,  showing  a  linearly  decreasing  trend.  The  DC  frequency  tunning  of  ~3%  (-110V  to  +80V)  is  achieved  at  a  high  temperature  3  times  higher  than  the  room  temperature.  This  chapter  aims  to  understand  the  physics  behind  the  FBAR  switching  mechanism  and  to  fabricate  sub-6GHz  tunable  hybrid  filters.On  the  other  hand,  the  evolution  of  the  5G  market  has  pushed  the  research  focus  to  FBARs  operating  in  mmWave  frequencies.  Chapter  4  of  this  dissertation  will  focus  on  designing,  fabricating,  and  characterizing  the  ultra-thin  film  FBARs  operating  between  18-  23GHz.  The  ultra-thin  film  used  in  this  work  has  a  fully  epitaxial-grown  resonating  stack,  resulting  in  not  only  a  perfect  single  crystalline  structure  of  the  piezoelectric  layer  but  also  a  perfect  metal/piezoelectric  contact,  which  improves  the  resonant  device  performance  by  removing  the  effect  of  thin  oxide  formed  on  top  of  the  piezoelectric  layer.  This  work  also  utilized  a  cascaded  FBAR  (cas-FBAR)  structure  that  maximized  the  active  area  and  improved  the  power  handling  capability  of  the  fabricated  devices,  demonstrating  one  of  the  highest  figure  of  merit  (kt  2  x  Q,  FoM)  FBAR  devices  at  similar  operating  frequencies.  Finally,  chapter  5  concludes  this  thesis  by  proposing  future  directions  toward  optimizing  the  device.
■590    ▼aSchool  code:  0078.
■650  4▼aRandom  access  memory
■650  4▼aCommunication  channels
■650  4▼aRadio  frequency
■650  4▼aResidual  stress
■650  4▼aHigh  temperature
■650  4▼aMetal  fatigue
■650  4▼aEtching
■650  4▼aAluminum
■650  4▼aDesign
■650  4▼aLead
■650  4▼aCommunications  systems
■650  4▼aAcoustics
■650  4▼aTransistors
■650  4▼aThin  films
■650  4▼aScanning  electron  microscopy
■650  4▼aAnalytical  chemistry
■650  4▼aCondensed  matter  physics
■650  4▼aElectrical  engineering
■650  4▼aMaterials  science
■650  4▼aThermodynamics
■690    ▼a0389
■690    ▼a0986
■690    ▼a0486
■690    ▼a0611
■690    ▼a0544
■690    ▼a0794
■690    ▼a0348
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05A.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360551▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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