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Engineering a Self-Aligned Metal-Oxide-Semiconductor Gate Stack for Nano-Modular Device Fabrication
Engineering a Self-Aligned Metal-Oxide-Semiconductor Gate Stack for Nano-Modular Device Fa...
Engineering a Self-Aligned Metal-Oxide-Semiconductor Gate Stack for Nano-Modular Device Fabrication

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자료유형  
 학위논문 서양
최종처리일시  
20260202105539
ISBN  
9798265400857
DDC  
600
저자명  
Brummer, Amy C.
서명/저자  
Engineering a Self-Aligned Metal-Oxide-Semiconductor Gate Stack for Nano-Modular Device Fabrication
발행사항  
[Sl] : Georgia Institute of Technology, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
145 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: A.
주기사항  
Advisor: Vogel, Eric M.;Filler, Michael A.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
초록/해제  
요약Conventional integrated circuit technology has made great strides over the past 50 years and today can produce integrated circuits (ICs) with billions of nanoscale transistors. However, much of today's state-of-the-art semiconductor research focuses on technological improvements and advancements for manufacturing within the already established IC fabrication framework. The planar process for IC manufacturing involves hundreds of precise processing steps to fabricate monolithic ICs, and the development of new chip designs is an expensive and long process, which can limit process and product innovation. But what if electronics fabrication could be a more dynamic and customizable process that could still manufacture are large scales? By shifting the fabrication paradigm and embracing scalable, bottom-up manufacturing techniques, fully formed highperformance transistors can be produced and interconnected for low-cost fabrication of customizable circuitry. For example, high-performance modular nanowire transistors can be synthesized using bulk processing methods. The pre-fabricated devices can be deposited on a substrate, and metal interconnects can be adaptively printed to form circuits.This work focuses on developing a self-aligned gate stack that would enable the production of bottom-up nanowire electronic devices and on understanding how material deposition and post-processing impacts performance of the devices. A polymer masking material is used to pattern dopant-modulated silicon (Si) nanowires. This enables the selective deposition of a high-κ dielectric and a metal electrode via atomic layer deposition (ALD) to form a metal-oxide-semiconductor (MOS) gate stack around the channel region of the nanowire. This final structure is a functional, nano-modular field-effect transistor device that can be interconnected with other devices to form circuits.In the first part of this work, we develop the techniques and investigate the materials needed to fabricate the self-aligned gate stack. The polymer patterning process, referred to as Selective Co-Axial Lithography via Etching of Surfaces (SCALES), has been previously demonstrated by the group on semiconductor nanowires. This work adapts the SCALES process for planar Si substrates to enable the use of characterization techniques that require samples larger than a nanowire. With the planar SCALES process, a polymer film is synthesized across the entire surface of a planar, dopant-modulated substrate and then selectively etched with potassium hydroxide. Polymer remains attached to the heavily boron-doped regions, resulting in a polymer mask aligned to the dopant pattern of the underlying substrate. This patterned polymer mask enables the use of area-selective atomic layer deposition (AS-ALD) to deposit the high-κ dielectric and metal electrode. The selectivity of deposition is investigated for a variety of oxides and metals via AS-ALD, and ultimately hafnium oxide and platinum are determined to be the optimal materials system.The second part of this work focuses on fabricating and optimizing the self-aligned gate stack. We first demonstrate the successful deposition of a complete MOS gate stack by selectively depositing Pt on top of HfO2 on a boron-patterned Si substrate. The resulting structures are MOS capacitors that are characterized electronically to investigate how the selective deposition and post-deposition anneal impacts device performance. The quality of the oxide-semiconductor interface is particularly important for MOS device performance, so the HfO2-Si interface is investigated in detail by examining different SiO2 interlayer formation techniques. Physical characterization is used to understand the relationship between the interlayer formation and electrical performance. In summary, this work develops a self-aligned gate stack fabrication process and investigates the impact of processing on the electrical performance of the materials. And this self-aligned gate stack deposition process provides a pathway towards fabricating modular nanowire transistors.
일반주제명  
Metals
일반주제명  
Boron
일반주제명  
Semiconductor research
일반주제명  
Gold
일반주제명  
Electrodes
일반주제명  
Nanoparticles
일반주제명  
Polymerization
일반주제명  
Nanomaterials
일반주제명  
Electronics
일반주제명  
Transistors
일반주제명  
Scanning electron microscopy
일반주제명  
Nitrogen
일반주제명  
Polymers
일반주제명  
Integrated circuits
일반주제명  
Nanowires
일반주제명  
Gases
일반주제명  
Plasma etching
일반주제명  
Chemical vapor deposition
일반주제명  
Computer engineering
일반주제명  
Design
일반주제명  
Silicon wafers
일반주제명  
Analytical chemistry
일반주제명  
Electrical engineering
일반주제명  
Industrial engineering
일반주제명  
Materials science
일반주제명  
Nanotechnology
일반주제명  
Polymer chemistry
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05A.
전자적 위치 및 접속  
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MARC

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■1001  ▼aBrummer,  Amy  C.
■24510▼aEngineering  a  Self-Aligned  Metal-Oxide-Semiconductor  Gate  Stack  for  Nano-Modular  Device  Fabrication
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a145  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  A.
■500    ▼aAdvisor:  Vogel,  Eric  M.;Filler,  Michael  A.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2023.
■520    ▼aConventional  integrated  circuit  technology  has  made  great  strides  over  the  past  50  years  and  today  can  produce  integrated  circuits  (ICs)  with  billions  of  nanoscale  transistors.  However,  much  of  today's  state-of-the-art  semiconductor  research  focuses  on  technological  improvements  and  advancements  for  manufacturing  within  the  already  established  IC  fabrication  framework.  The  planar  process  for  IC  manufacturing  involves  hundreds  of  precise  processing  steps  to  fabricate  monolithic  ICs,  and  the  development  of  new  chip  designs  is  an  expensive  and  long  process,  which  can  limit  process  and  product  innovation.  But  what  if  electronics  fabrication  could  be  a  more  dynamic  and  customizable  process  that  could  still  manufacture  are  large  scales?  By  shifting  the  fabrication  paradigm  and  embracing  scalable,  bottom-up  manufacturing  techniques,  fully  formed  highperformance  transistors  can  be  produced  and  interconnected  for  low-cost  fabrication  of  customizable  circuitry.  For  example,  high-performance  modular  nanowire  transistors  can  be  synthesized  using  bulk  processing  methods.  The  pre-fabricated  devices  can  be  deposited  on  a  substrate,  and  metal  interconnects  can  be  adaptively  printed  to  form  circuits.This  work  focuses  on  developing  a  self-aligned  gate  stack  that  would  enable  the  production  of  bottom-up  nanowire  electronic  devices  and  on  understanding  how  material  deposition  and  post-processing  impacts  performance  of  the  devices.  A  polymer  masking  material  is  used  to  pattern  dopant-modulated  silicon  (Si)  nanowires.  This  enables  the  selective  deposition  of  a  high-κ  dielectric  and  a  metal  electrode  via  atomic  layer  deposition  (ALD)  to  form  a  metal-oxide-semiconductor  (MOS)  gate  stack  around  the  channel  region  of  the  nanowire.  This  final  structure  is  a  functional,  nano-modular  field-effect  transistor  device  that  can  be  interconnected  with  other  devices  to  form  circuits.In  the  first  part  of  this  work,  we  develop  the  techniques  and  investigate  the  materials  needed  to  fabricate  the  self-aligned  gate  stack.  The  polymer  patterning  process,  referred  to  as  Selective  Co-Axial  Lithography  via  Etching  of  Surfaces  (SCALES),  has  been  previously  demonstrated  by  the  group  on  semiconductor  nanowires.  This  work  adapts  the  SCALES  process  for  planar  Si  substrates  to  enable  the  use  of  characterization  techniques  that  require  samples  larger  than  a  nanowire.  With  the  planar  SCALES  process,  a  polymer  film  is  synthesized  across  the  entire  surface  of  a  planar,  dopant-modulated  substrate  and  then  selectively  etched  with  potassium  hydroxide.  Polymer  remains  attached  to  the  heavily  boron-doped  regions,  resulting  in  a  polymer  mask  aligned  to  the  dopant  pattern  of  the  underlying  substrate.  This  patterned  polymer  mask  enables  the  use  of  area-selective  atomic  layer  deposition  (AS-ALD)  to  deposit  the  high-κ  dielectric  and  metal  electrode.  The  selectivity  of  deposition  is  investigated  for  a  variety  of  oxides  and  metals  via  AS-ALD,  and  ultimately  hafnium  oxide  and  platinum  are  determined  to  be  the  optimal  materials  system.The  second  part  of  this  work  focuses  on  fabricating  and  optimizing  the  self-aligned  gate  stack.  We  first  demonstrate  the  successful  deposition  of  a  complete  MOS  gate  stack  by  selectively  depositing  Pt  on  top  of  HfO2  on  a  boron-patterned  Si  substrate.  The  resulting  structures  are  MOS  capacitors  that  are  characterized  electronically  to  investigate  how  the  selective  deposition  and  post-deposition  anneal  impacts  device  performance.  The  quality  of  the  oxide-semiconductor  interface  is  particularly  important  for  MOS  device  performance,  so  the  HfO2-Si  interface  is  investigated  in  detail  by  examining  different  SiO2  interlayer  formation  techniques.  Physical  characterization  is  used  to  understand  the  relationship  between  the  interlayer  formation  and  electrical  performance.  In  summary,  this  work  develops  a  self-aligned  gate  stack  fabrication  process  and  investigates  the  impact  of  processing  on  the  electrical  performance  of  the  materials.  And  this  self-aligned  gate  stack  deposition  process  provides  a  pathway  towards  fabricating  modular  nanowire  transistors.
■590    ▼aSchool  code:  0078.
■650  4▼aMetals
■650  4▼aBoron
■650  4▼aSemiconductor  research
■650  4▼aGold
■650  4▼aElectrodes
■650  4▼aNanoparticles
■650  4▼aPolymerization
■650  4▼aNanomaterials
■650  4▼aElectronics
■650  4▼aTransistors
■650  4▼aScanning  electron  microscopy
■650  4▼aNitrogen
■650  4▼aPolymers
■650  4▼aIntegrated  circuits
■650  4▼aNanowires
■650  4▼aGases
■650  4▼aPlasma  etching
■650  4▼aChemical  vapor  deposition
■650  4▼aComputer  engineering
■650  4▼aDesign
■650  4▼aSilicon  wafers
■650  4▼aAnalytical  chemistry
■650  4▼aElectrical  engineering
■650  4▼aIndustrial  engineering
■650  4▼aMaterials  science
■650  4▼aNanotechnology
■650  4▼aPolymer  chemistry
■690    ▼a0389
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■690    ▼a0546
■690    ▼a0794
■690    ▼a0652
■690    ▼a0495
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05A.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360516▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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