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Zirconium-Doped Hafnium Oxide Based Ferroelectric Materials for Memory Applications
Zirconium-Doped Hafnium Oxide Based Ferroelectric Materials for Memory Applications
Zirconium-Doped Hafnium Oxide Based Ferroelectric Materials for Memory Applications

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260209102845
ISBN  
9798288816857
DDC  
540
저자명  
Huang, Fei.
서명/저자  
Zirconium-Doped Hafnium Oxide Based Ferroelectric Materials for Memory Applications
발행사항  
[Sl] : Stanford University, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
133 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Wong, S. Simon.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2023.
초록/해제  
요약As data processing and storage needs continue to grow at a rapid pace, the development of innovative memory technologies is crucial. The discovery of ferroelectricity in hafnia (HfO2)-based materials has garnered significant attention in both academia and industry, owing to their potential to revolutionize non-volatile memory (NVM) technology and enable novel computing architectures. HfO2-based ferroelectric materials offer advantages over conventional perovskite oxides, such as low-temperature synthesis and conformal growth in three-dimensional structures on silicon, making them compatible with complementary metal-oxide-semiconductor (CMOS) technology and ideal for device scaling. However, several challenges still exist for implementing ferroelectric HfO2 in commercial products, such as polarization variation during cycling (wake-up effect), high operation voltage, compatibility with back-end-of-line (BEOL) processing temperatures, and low memory density. In this dissertation, I tackled the challenges outlined above. I began by focusing on the Hf0.5Zr0.5O2 (HZO) material itself and addressing the wake-up effect through the introduction of an HfO2 buffer layer at the HZO/electrode interface. Subsequently, I developed a new measurement setup capable of directly measuring individual nm-sized devices, which enabled investigating the scaling effect in HZO-based ferroelectric capacitors. Through my research, I was able to demonstrate excellent ferroelectricity and reliability in ultra-thin HZO (4 nm) capacitors with molybdenum (Mo) electrodes. These capacitors exhibited low operation voltage, wake-up-free behavior, high endurance, and low RTA temperatures, making them highly desirable for practical applications. I also studied the size scaling effect down to 65 nm x 45 nm devices, where I observed ultra-high remanent polarization (2Pr) for the first time at this scale. In addition to exploring two-dimensional scaling to improve density, I also proposed a hybrid structure for 4 bits/cell storage, increasing the multi-bit capability in a single cell.
일반주제명  
Crystal structure
일반주제명  
Transmission electron microscopy
일반주제명  
Behavior
일반주제명  
Random access memory
일반주제명  
Electrodes
일반주제명  
Electric fields
일반주제명  
Metal fatigue
일반주제명  
CMOS
일반주제명  
Engineering
일반주제명  
Research & development--R&D
일반주제명  
Transistors
일반주제명  
Thin films
일반주제명  
Ferroelectrics
일반주제명  
Radiation
일반주제명  
Electromagnetics
일반주제명  
Electrical engineering
키워드  
Ferroelectricity
키워드  
Non-volatile memory technology
키워드  
Ferroelectric capacitors
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

 008260203s2023        us                              c    eng  d
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■035    ▼a(MiAaPQ)AAI32201023
■035    ▼a(MiAaPQ)Stanfordxf591sb3621
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a540
■1001  ▼aHuang,  Fei.
■24510▼aZirconium-Doped  Hafnium  Oxide  Based  Ferroelectric  Materials  for  Memory  Applications
■260    ▼a[Sl]▼bStanford  University▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a133  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Wong,  S.  Simon.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2023.
■520    ▼aAs  data  processing  and  storage  needs  continue  to  grow  at  a  rapid  pace,  the  development  of  innovative  memory  technologies  is  crucial.  The  discovery  of  ferroelectricity  in  hafnia  (HfO2)-based  materials  has  garnered  significant  attention  in  both  academia  and  industry,  owing  to  their  potential  to  revolutionize  non-volatile  memory  (NVM)  technology  and  enable  novel  computing  architectures.  HfO2-based  ferroelectric  materials  offer  advantages  over  conventional  perovskite  oxides,  such  as  low-temperature  synthesis  and  conformal  growth  in  three-dimensional  structures  on  silicon,  making  them  compatible  with  complementary  metal-oxide-semiconductor  (CMOS)  technology  and  ideal  for  device  scaling.  However,  several  challenges  still  exist  for  implementing  ferroelectric  HfO2  in  commercial  products,  such  as  polarization  variation  during  cycling  (wake-up  effect),  high  operation  voltage,  compatibility  with  back-end-of-line  (BEOL)  processing  temperatures,  and  low  memory  density.  In  this  dissertation,  I  tackled  the  challenges  outlined  above.  I  began  by  focusing  on  the  Hf0.5Zr0.5O2  (HZO)  material  itself  and  addressing  the  wake-up  effect  through  the  introduction  of  an  HfO2  buffer  layer  at  the  HZO/electrode  interface.  Subsequently,  I  developed  a  new  measurement  setup  capable  of  directly  measuring  individual  nm-sized  devices,  which  enabled  investigating  the  scaling  effect  in  HZO-based  ferroelectric  capacitors.  Through  my  research,  I  was  able  to  demonstrate  excellent  ferroelectricity  and  reliability  in  ultra-thin  HZO  (4  nm)  capacitors  with  molybdenum  (Mo)  electrodes.  These  capacitors  exhibited  low  operation  voltage,  wake-up-free  behavior,  high  endurance,  and  low  RTA  temperatures,  making  them  highly  desirable  for  practical  applications.  I  also  studied  the  size  scaling  effect  down  to  65  nm  x  45  nm  devices,  where  I  observed  ultra-high  remanent  polarization  (2Pr)  for  the  first  time  at  this  scale.  In  addition  to  exploring  two-dimensional  scaling  to  improve  density,  I  also  proposed  a  hybrid  structure  for  4  bits/cell  storage,  increasing  the  multi-bit  capability  in  a  single  cell.
■590    ▼aSchool  code:  0212.
■650  4▼aCrystal  structure
■650  4▼aTransmission  electron  microscopy
■650  4▼aBehavior
■650  4▼aRandom  access  memory
■650  4▼aElectrodes
■650  4▼aElectric  fields
■650  4▼aMetal  fatigue
■650  4▼aCMOS
■650  4▼aEngineering
■650  4▼aResearch  &  development--R&D
■650  4▼aTransistors
■650  4▼aThin  films
■650  4▼aFerroelectrics
■650  4▼aRadiation
■650  4▼aElectromagnetics
■650  4▼aElectrical  engineering
■653    ▼aFerroelectricity
■653    ▼aNon-volatile  memory  technology
■653    ▼aFerroelectric  capacitors
■690    ▼a0537
■690    ▼a0544
■690    ▼a0607
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17365876▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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