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Atomistic Simulations to Model Defect Formation, Diffusion, and Ordering in Cu(In,Ga)Se2 and Cd(Se,Te) Alloys
Atomistic Simulations to Model Defect Formation, Diffusion, and Ordering in Cu(In,Ga)Se2 a...
Atomistic Simulations to Model Defect Formation, Diffusion, and Ordering in Cu(In,Ga)Se2 and Cd(Se,Te) Alloys

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152718
ISBN  
9798384096412
DDC  
542
저자명  
Gehrke, Aaron.
서명/저자  
Atomistic Simulations to Model Defect Formation, Diffusion, and Ordering in Cu(In,Ga)Se2 and Cd(Se,Te) Alloys
발행사항  
[Sl] : University of Washington, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
143 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Dunham, Scott.
학위논문주기  
Thesis (Ph.D.)--University of Washington, 2024.
초록/해제  
요약To improve the performance of Cu(In,Ga)Se2 and Cd(Se,Te) thin-film photovoltaic devices, a robust understanding of the alloy species is needed. The presence of alloying introduces unique challenges, as multiple species are randomly dispersed on the same lattice sites in the material. To optimize device performance, it is necessary to understand and control the precise arrangement of these alloy species. First, it is necessary to understand the energetic interactions between the alloy species and the other species (and defects) in the system, as these interactions determine the types of ordering expected. Second, it is necessary to understand the diffusivity of the alloy species, as it is needed to predict the actual kinetically-limited structures that form under different processing conditions. Third, it is necessary to understand how the alloy arrangement affects the behavior of other critical defects in the material, as this can impact phenomena such as dopant activation. Multi-scale modeling, where results from ab initio calculations (such as those from density functional theory) are fed into higher-level models (such as kinetic lattice Monte Carlo and continuum simulations), is well-suited for exploring the behavior of alloys considered here. In this work, we predict the diffusion under varying conditions of In and Ga in Cu(In,Ga)Se2 and of the intrinsic defects in Cd(Se,Te). We develop a nearest-neighbor interaction model to predict In/Ga ordering in Cu(In,Ga)Se2 alloys, finding a positive correlation between the Ga concentration and the presence of vacancies on the Cu-sublattice. We use this model to predict the band gap fluctuations resulting from these composition variations under a range of different processing conditions, producing results that agree well with experiment. We demonstrate a mechanism to passivate detrimental CuIn defects in Cu(In,Ga)Se2. We conduct a detailed analysis of the effects of Se/Te ordering in Cd(Se,Te) on the formation of detrimental AX center compensating defects, and investigate possible mitigation methods. Lastly, we present work done in conjunction with the UW MEM-C program on (1010) surface reconstructions in ZnO.
일반주제명  
Computational chemistry
일반주제명  
Materials science
일반주제명  
Applied physics
키워드  
Atomistic simulations
키워드  
Diffusion
키워드  
Thin-film photovoltaic devices
키워드  
Density functional theory
기타저자  
University of Washington Materials Science and Engineering
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI31489434
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a542
■1001  ▼aGehrke,  Aaron.
■24510▼aAtomistic  Simulations  to  Model  Defect  Formation,  Diffusion,  and  Ordering  in  Cu(In,Ga)Se2  and  Cd(Se,Te)  Alloys
■260    ▼a[Sl]▼bUniversity  of  Washington▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a143  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Dunham,  Scott.
■5021  ▼aThesis  (Ph.D.)--University  of  Washington,  2024.
■520    ▼aTo  improve  the  performance  of  Cu(In,Ga)Se2  and  Cd(Se,Te)  thin-film  photovoltaic  devices,  a  robust  understanding  of  the  alloy  species  is  needed.  The  presence  of  alloying  introduces  unique  challenges,  as  multiple  species  are  randomly  dispersed  on  the  same  lattice  sites  in  the  material.  To  optimize  device  performance,  it  is  necessary  to  understand  and  control  the  precise  arrangement  of  these  alloy  species.  First,  it  is  necessary  to  understand  the  energetic  interactions  between  the  alloy  species  and  the  other  species  (and  defects)  in  the  system,  as  these  interactions  determine  the  types  of  ordering  expected.  Second,  it  is  necessary  to  understand  the  diffusivity  of  the  alloy  species,  as  it  is  needed  to  predict  the  actual  kinetically-limited  structures  that  form  under  different  processing  conditions.  Third,  it  is  necessary  to  understand  how  the  alloy  arrangement  affects  the  behavior  of  other  critical  defects  in  the  material,  as  this  can  impact  phenomena  such  as  dopant  activation.  Multi-scale  modeling,  where  results  from  ab  initio  calculations  (such  as  those  from  density  functional  theory)  are  fed  into  higher-level  models  (such  as  kinetic  lattice  Monte  Carlo  and  continuum  simulations),  is  well-suited  for  exploring  the  behavior  of  alloys  considered  here.  In  this  work,  we  predict  the  diffusion  under  varying  conditions  of  In  and  Ga  in  Cu(In,Ga)Se2  and  of  the  intrinsic  defects  in  Cd(Se,Te).  We  develop  a  nearest-neighbor  interaction  model  to  predict  In/Ga  ordering  in  Cu(In,Ga)Se2  alloys,  finding  a  positive  correlation  between  the  Ga  concentration  and  the  presence  of  vacancies  on  the  Cu-sublattice.  We  use  this  model  to  predict  the  band  gap  fluctuations  resulting  from  these  composition  variations  under  a  range  of  different  processing  conditions,  producing  results  that  agree  well  with  experiment.  We  demonstrate  a  mechanism  to  passivate  detrimental  CuIn  defects  in  Cu(In,Ga)Se2.  We  conduct  a  detailed  analysis  of  the  effects  of  Se/Te  ordering  in  Cd(Se,Te)  on  the  formation  of  detrimental  AX  center  compensating  defects,  and  investigate  possible  mitigation  methods.  Lastly,  we  present  work  done  in  conjunction  with  the  UW  MEM-C  program  on  (1010)  surface  reconstructions  in  ZnO.
■590    ▼aSchool  code:  0250.
■650  4▼aComputational  chemistry
■650  4▼aMaterials  science
■650  4▼aApplied  physics
■653    ▼aAtomistic  simulations
■653    ▼aDiffusion
■653    ▼aThin-film  photovoltaic  devices
■653    ▼aDensity  functional  theory
■690    ▼a0794
■690    ▼a0219
■690    ▼a0215
■71020▼aUniversity  of  Washington▼bMaterials  Science  and  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0250
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163517▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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