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Engineering Hole Injection and Transport in low-Dimensional Material Transistors
Engineering Hole Injection and Transport in low-Dimensional Material Transistors
Engineering Hole Injection and Transport in low-Dimensional Material Transistors

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211153002
ISBN  
9798346383642
DDC  
621.39
저자명  
Oberoi, Aaryan.
서명/저자  
Engineering Hole Injection and Transport in low-Dimensional Material Transistors
발행사항  
[Sl] : The Pennsylvania State University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
273 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Das, Saptarshi.
학위논문주기  
Thesis (Ph.D.)--The Pennsylvania State University, 2024.
초록/해제  
요약In response to the slowdown in transistor footprint scaling, and the increasing computational demands, advanced device development for high-performance and low-power logic applications has routed towards stacking of complementary Silicon (Si) nanosheets. However, traditional Si technology is reaching a tipping point owing to its thickness scaling limitations. Alternative device geometries proposed to reduce leakage while improving electrostatics require materials with beyond-Si capabilities. The utilization of novel, inherently-low-dimensional, semiconducting channel materials with superior electronic properties such as 2D Transition Metal Dichalcogenides (TMDs) and 1D Carbon Nanotubes (CNTs) have been proposed to extend the technology roadmap beyond Si. Conversely, innovative approaches to integrate memory and logic functionalities are worth exploring to address computation demands by tackling data-transfer bottlenecks. Furthermore, always-ON, edge devices, connected across platforms in this digital age, pose a serious security threat. Hence, a ground-up makeover in the next-generation of electronics powered by beyond-Si TMD materials is implemented through a single logic transistor capable of integrating memory, sensing, and security primitives.However, for beyond-Si-CMOS technology the need for enhancing p-type (hole) transport in 2D field-effect transistors (FETs) is identified as a critical yet challenging aspect. Tungsten Diselenide and Molybdenum Diselenide are proposed as promising 2D channel materials due to the more favorable Fermi-level pinning behavior near valence band edge. Techniques such as work-function engineering with the use of Palladium and contact interface optimization with the incorporation of Selenium, are explored to statistically improve hole injection efficiency. Following this strategy, a 3X reduction in contact resistance is achieved, down to 16 kΩ µm.Further, the research delves into threshold voltage engineering of p-type 2D channels using electrostatic modulation, gate dielectric optimization, and charge transfer oxide capping to achieve precise control over threshold voltage. Oxides of Molybdenum, Tungsten, and Germanium are studied in detail for their charge transfer mechanisms into the TMD channel. A large range in threshold voltage is achieved to modulate device behavior between high-performance and low-power operation with current switching ratio over 8 orders in magnitude.Precise layer engineering strategies are also elaborated, aiming to refine the transport properties of p-type transistors through uniform bilayer growth and layer functionalization techniques. Monolayer oxidation by plasma treatment of bilayer WSe2channel with Palladium contacts, reduces contact resistance by 9X whereas functionalization by annealing in NO environment reduces contact resistance down to 3.5 kΩ µm while maintaining current switching ratio over 6 orders in magnitude. Following this, an approach to achieving high-performance p-type 2D FETs is completed.Finally, interface characterization in 1D CNT channels is discussed, presenting methods to mitigate interface defects by post-process annealing. Furthermore, temperature-dependent impedance analysis is employed to assess defect densities across the semiconductor energy gap. This concludes by underscoring the importance of interface characterization in all-interface devices such as devices on low-dimensional channel materials. This work aims to highlight the potential of low-dimensional materials for beyond-Si-CMOS logic.
일반주제명  
Microprocessors
일반주제명  
Fourier transforms
일반주제명  
Semiconductors
일반주제명  
Single crystals
일반주제명  
Light emitting diodes
일반주제명  
Design
일반주제명  
CMOS
일반주제명  
Metal oxides
일반주제명  
Grain size
일반주제명  
Graphene
일반주제명  
Transistors
일반주제명  
Energy consumption
일반주제명  
Shear strain
일반주제명  
Entropy
일반주제명  
Electrical engineering
일반주제명  
Energy
일반주제명  
Mathematics
일반주제명  
Optics
기타저자  
The Pennsylvania State 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    ▼a9798346383642
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■035    ▼a(MiAaPQ)PennState20700auo337
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a621.39
■1001  ▼aOberoi,  Aaryan.
■24510▼aEngineering  Hole  Injection  and  Transport  in  low-Dimensional  Material  Transistors
■260    ▼a[Sl]▼bThe  Pennsylvania  State  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a273  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Das,  Saptarshi.
■5021  ▼aThesis  (Ph.D.)--The  Pennsylvania  State  University,  2024.
■520    ▼aIn  response  to  the  slowdown  in  transistor  footprint  scaling,  and  the  increasing  computational  demands,  advanced  device  development  for  high-performance  and  low-power  logic  applications  has  routed  towards  stacking  of  complementary  Silicon  (Si)  nanosheets.  However,  traditional  Si  technology  is  reaching  a  tipping  point  owing  to  its  thickness  scaling  limitations.  Alternative  device  geometries  proposed  to  reduce  leakage  while  improving  electrostatics  require  materials  with  beyond-Si  capabilities.  The  utilization  of  novel,  inherently-low-dimensional,  semiconducting  channel  materials  with  superior  electronic  properties  such  as  2D  Transition  Metal  Dichalcogenides  (TMDs)  and  1D  Carbon  Nanotubes  (CNTs)  have  been  proposed  to  extend  the  technology  roadmap  beyond  Si.  Conversely,  innovative  approaches  to  integrate  memory  and  logic  functionalities  are  worth  exploring  to  address  computation  demands  by  tackling  data-transfer  bottlenecks.  Furthermore,  always-ON,  edge  devices,  connected  across  platforms  in  this  digital  age,  pose  a  serious  security  threat.  Hence,  a  ground-up  makeover  in  the  next-generation  of  electronics  powered  by  beyond-Si  TMD  materials  is  implemented  through  a  single  logic  transistor  capable  of  integrating  memory,  sensing,  and  security  primitives.However,  for  beyond-Si-CMOS  technology  the  need  for  enhancing  p-type  (hole)  transport  in  2D  field-effect  transistors  (FETs)  is  identified  as  a  critical  yet  challenging  aspect.  Tungsten  Diselenide  and  Molybdenum  Diselenide  are  proposed  as  promising  2D  channel  materials  due  to  the  more  favorable  Fermi-level  pinning  behavior  near  valence  band  edge.  Techniques  such  as  work-function  engineering  with  the  use  of  Palladium  and  contact  interface  optimization  with  the  incorporation  of  Selenium,  are  explored  to  statistically  improve  hole  injection  efficiency.  Following  this  strategy,  a  3X  reduction  in  contact  resistance  is  achieved,  down  to  16  kΩ  µm.Further,  the  research  delves  into  threshold  voltage  engineering  of  p-type  2D  channels  using  electrostatic  modulation,  gate  dielectric  optimization,  and  charge  transfer  oxide  capping  to  achieve  precise  control  over  threshold  voltage.  Oxides  of  Molybdenum,  Tungsten,  and  Germanium  are  studied  in  detail  for  their  charge  transfer  mechanisms  into  the  TMD  channel.  A  large  range  in  threshold  voltage  is  achieved  to  modulate  device  behavior  between  high-performance  and  low-power  operation  with  current  switching  ratio  over  8  orders  in  magnitude.Precise  layer  engineering  strategies  are  also  elaborated,  aiming  to  refine  the  transport  properties  of  p-type  transistors  through  uniform  bilayer  growth  and  layer  functionalization  techniques.  Monolayer  oxidation  by  plasma  treatment  of  bilayer  WSe2channel  with  Palladium  contacts,  reduces  contact  resistance  by  9X  whereas  functionalization  by  annealing  in  NO  environment  reduces  contact  resistance  down  to  3.5  kΩ  µm  while  maintaining  current  switching  ratio  over  6  orders  in  magnitude.  Following  this,  an  approach  to  achieving  high-performance  p-type  2D  FETs  is  completed.Finally,  interface  characterization  in  1D  CNT  channels  is  discussed,  presenting  methods  to  mitigate  interface  defects  by  post-process  annealing.  Furthermore,  temperature-dependent  impedance  analysis  is  employed  to  assess  defect  densities  across  the  semiconductor  energy  gap.  This  concludes  by  underscoring  the  importance  of  interface  characterization  in  all-interface  devices  such  as  devices  on  low-dimensional  channel  materials.  This  work  aims  to  highlight  the  potential  of  low-dimensional  materials  for  beyond-Si-CMOS  logic.
■590    ▼aSchool  code:  0176.
■650  4▼aMicroprocessors
■650  4▼aFourier  transforms
■650  4▼aSemiconductors
■650  4▼aSingle  crystals
■650  4▼aLight  emitting  diodes
■650  4▼aDesign
■650  4▼aCMOS
■650  4▼aMetal  oxides
■650  4▼aGrain  size
■650  4▼aGraphene
■650  4▼aTransistors
■650  4▼aEnergy  consumption
■650  4▼aShear  strain
■650  4▼aEntropy
■650  4▼aElectrical  engineering
■650  4▼aEnergy
■650  4▼aMathematics
■650  4▼aOptics
■690    ▼a0389
■690    ▼a0544
■690    ▼a0791
■690    ▼a0405
■690    ▼a0752
■71020▼aThe  Pennsylvania  State  University.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0176
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164438▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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