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Anion Exchange Doping in Semiconducting Polymers
Anion Exchange Doping in Semiconducting Polymers
Anion Exchange Doping in Semiconducting Polymers

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211153124
ISBN  
9798346855187
DDC  
540
저자명  
Mehmedovic, Zerina.
서명/저자  
Anion Exchange Doping in Semiconducting Polymers
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
113 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
주기사항  
Advisor: Schwartz, Benjamin J.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약Conjugated polymers (CPs) are organic semiconducting materials that offer a promising alternative to inorganic semiconductors as they are flexible, inexpensive, and solution-processable. The biggest challenge in integrating CPs into thermoelectric and other devices is their limited electrical conductivity, especially in comparison to their inorganic counterparts. Recent efforts have focused on enhancing the performance of CPs by using another molecule to dope the polymer and create charge carriers. The sequential processing (SqP) method [Aguirre et. al. Adv. Energy Mater. 2015, 1402020], developed by our group, works by casting the polymer and dopants from semi-orthogonal solvents. By separating the polymer and doping casting steps, the polymer has enough time to aggregate, allowing control over the polymer crystallinity by changing the regioregularity or polymer processing conditions. Using SqP, we can study the effects of tuning the polymer crystallinity with anion-exchange (AX) doping, in which a high concentration of inert salt anion accompanies the introduction of the dopant [Yamashita et. al. Nature 572,634-638 (2019)]. In this dissertation, we will explore how introducing a molecular oxidant with and without an inert salt affects the conductivity of polymers with different crystallinities; we also will examine new spectroscopic features associated with AX doping that to date have been unassigned in the literature. The first chapter of this dissertation gives an overview of conjugated polymers, different doping mechanisms, and the tools we use to analyze doped-polymers including absorption, x-ray diffraction, and electrical Hall effect measurements. In chapter two we focus on AX doping and how the new doping mechanism affects the electrical properties of a well-studied polymer with varying crystallinities. Chapter three explores two new spectroscopic features that appear when using high concentration dopant and salt during the AX doping process. Using Resonance Raman spectroscopy and quantum chemistry calculations, we are able to assign these peaks to a salt-dopant complex that is formed during the exchange process. Chapter four explores the doping mechanism of a very strong oxidant that has been recently introduced to the polymer literature. Although there is debate on if the dopant counterion infiltrates the entirety of the polymer or just the amorphous regions, we show that the dopant does affect the crystal structure, indicating its intercalation into crystalline sites. Finally, chapter five discusses theoretical calculations on tungsten tetraboride, a synthetic inorganic material that has been discovered to have superhard characteristics. This chapter explores the various bonding properties of tungsten tetraboride to understand if the hardening affects are due to extrinsic or intrinsic affects. Although many unsolved questions remain in the conjugated polymer field, this dissertation breaks ground as foundational work in understanding new doping methods and molecular oxidants that have been introduced into the field.
일반주제명  
Chemistry
일반주제명  
Polymer chemistry
일반주제명  
Analytical chemistry
일반주제명  
Materials science
키워드  
Anion exchange
키워드  
Conjugated polymers
키워드  
Doping
키워드  
Electronic properties
키워드  
Hall effect
기타저자  
University of California, Los Angeles Chemistry 0153
기본자료저록  
Dissertations Abstracts International. 86-06B.
전자적 위치 및 접속  
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MARC

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■0820  ▼a540
■1001  ▼aMehmedovic,  Zerina.
■24510▼aAnion  Exchange  Doping  in  Semiconducting  Polymers
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a113  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-06,  Section:  B.
■500    ▼aAdvisor:  Schwartz,  Benjamin  J.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aConjugated  polymers  (CPs)  are  organic  semiconducting  materials  that  offer  a  promising  alternative  to  inorganic  semiconductors  as  they  are  flexible,  inexpensive,  and  solution-processable.  The  biggest  challenge  in  integrating  CPs  into  thermoelectric  and  other  devices  is  their  limited  electrical  conductivity,  especially  in  comparison  to  their  inorganic  counterparts.  Recent  efforts  have  focused  on  enhancing  the  performance  of  CPs  by  using  another  molecule  to  dope  the  polymer  and  create  charge  carriers.  The  sequential  processing  (SqP)  method  [Aguirre  et.  al.  Adv.  Energy  Mater.  2015,  1402020],  developed  by  our  group,  works  by  casting  the  polymer  and  dopants  from  semi-orthogonal  solvents.  By  separating  the  polymer  and  doping  casting  steps,  the  polymer  has  enough  time  to  aggregate,  allowing  control  over  the  polymer  crystallinity  by  changing  the  regioregularity  or  polymer  processing  conditions.  Using  SqP,  we  can  study  the  effects  of  tuning  the  polymer  crystallinity  with  anion-exchange  (AX)  doping,  in  which  a  high  concentration  of  inert  salt  anion  accompanies  the  introduction  of  the  dopant  [Yamashita  et.  al.  Nature  572,634-638  (2019)].  In  this  dissertation,  we  will  explore  how  introducing  a  molecular  oxidant  with  and  without  an  inert  salt  affects  the  conductivity  of  polymers  with  different  crystallinities;  we  also  will  examine  new  spectroscopic  features  associated  with  AX  doping  that  to  date  have  been  unassigned  in  the  literature.  The  first  chapter  of  this  dissertation  gives  an  overview  of  conjugated  polymers,  different  doping  mechanisms,  and  the  tools  we  use  to  analyze  doped-polymers  including  absorption,  x-ray  diffraction,  and  electrical  Hall  effect  measurements.  In  chapter  two  we  focus  on  AX  doping  and  how  the  new  doping  mechanism  affects  the  electrical  properties  of  a  well-studied  polymer  with  varying  crystallinities.  Chapter  three  explores  two  new  spectroscopic  features  that  appear  when  using  high  concentration  dopant  and  salt  during  the  AX  doping  process.  Using  Resonance  Raman  spectroscopy  and  quantum  chemistry  calculations,  we  are  able  to  assign  these  peaks  to  a  salt-dopant  complex  that  is  formed  during  the  exchange  process.  Chapter  four  explores  the  doping  mechanism  of  a  very  strong  oxidant  that  has  been  recently  introduced  to  the  polymer  literature.  Although  there  is  debate  on  if  the  dopant  counterion  infiltrates  the  entirety  of  the  polymer  or  just  the  amorphous  regions,  we  show  that  the  dopant  does  affect  the  crystal  structure,  indicating  its  intercalation  into  crystalline  sites.  Finally,  chapter  five  discusses  theoretical  calculations  on  tungsten  tetraboride,  a  synthetic  inorganic  material  that  has  been  discovered  to  have  superhard  characteristics.  This  chapter  explores  the  various  bonding  properties  of  tungsten  tetraboride  to  understand  if  the  hardening  affects  are  due  to  extrinsic  or  intrinsic  affects.  Although  many  unsolved  questions  remain  in  the  conjugated  polymer  field,  this  dissertation  breaks  ground  as  foundational  work  in  understanding  new  doping  methods  and  molecular  oxidants  that  have  been  introduced  into  the  field.
■590    ▼aSchool  code:  0031.
■650  4▼aChemistry
■650  4▼aPolymer  chemistry
■650  4▼aAnalytical  chemistry
■650  4▼aMaterials  science
■653    ▼aAnion  exchange
■653    ▼aConjugated  polymers
■653    ▼aDoping
■653    ▼aElectronic  properties
■653    ▼aHall  effect
■690    ▼a0485
■690    ▼a0486
■690    ▼a0495
■690    ▼a0794
■71020▼aUniversity  of  California,  Los  Angeles▼bChemistry  0153.
■7730  ▼tDissertations  Abstracts  International▼g86-06B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165104▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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