Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions

Doctoral Thesis in Materials Science.-- Group of Physical Chemistry of Surfaces and Interfaces, Institut de Ciència de Materials de Barcelona.-- Department of Physics, Faculty of Science, Universitat Autònoma de Barcelona.-- Supervisor: Dr. Esther Barrena; Tutor: Dr. Eva Maria Pellicer Vilà.

Detalles Bibliográficos
Autor: Silvestri, Francesco
Tipo de recurso: tesis doctoral
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/267402
Acceso en línea:http://hdl.handle.net/10261/267402
Access Level:acceso abierto
id ES_df9ea3bbfc85b44befb63066f5cb3fb1
oai_identifier_str oai:digital.csic.es:10261/267402
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
title Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
spellingShingle Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
Silvestri, Francesco
title_short Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
title_full Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
title_fullStr Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
title_full_unstemmed Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
title_sort Nanoscale Morphology and Structure of Organic Donor-Acceptor Heterojunctions
dc.creator.none.fl_str_mv Silvestri, Francesco
author Silvestri, Francesco
author_facet Silvestri, Francesco
author_role author
dc.contributor.none.fl_str_mv Barrena, Esther
Pellicer, Eva
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description Doctoral Thesis in Materials Science.-- Group of Physical Chemistry of Surfaces and Interfaces, Institut de Ciència de Materials de Barcelona.-- Department of Physics, Faculty of Science, Universitat Autònoma de Barcelona.-- Supervisor: Dr. Esther Barrena; Tutor: Dr. Eva Maria Pellicer Vilà.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
http://purl.org/coar/resource_type/c_db06
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/267402
url http://hdl.handle.net/10261/267402
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv CSIC - Instituto de Ciencia de Materiales de Barcelona (ICMAB)
Universidad Autónoma de Barcelona
publisher.none.fl_str_mv CSIC - Instituto de Ciencia de Materiales de Barcelona (ICMAB)
Universidad Autónoma de Barcelona
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422080667156480
spelling Nanoscale Morphology and Structure of Organic Donor-Acceptor HeterojunctionsSilvestri, FrancescoDoctoral Thesis in Materials Science.-- Group of Physical Chemistry of Surfaces and Interfaces, Institut de Ciència de Materials de Barcelona.-- Department of Physics, Faculty of Science, Universitat Autònoma de Barcelona.-- Supervisor: Dr. Esther Barrena; Tutor: Dr. Eva Maria Pellicer Vilà.The scientific effort dedicated to organic electronics in the last decades has led to impressive advancements in the field. Nevertheless, we are still far from fully exploiting the great potentiality offered by organic semiconductors (OSCs). Among the most crucial aspects determining the efficient operation of organic optoelectronic devices, we can find the control of the morphology of the active layers and their interfaces. The functionality of each of the organic layers composing the device, intimately depends on how the molecules arrange, order and orient in the solid film. As a consequence, characterizing the morphological and structural properties of the OSC films at the nanoscale is essential to understand and optimize the fundamental mechanisms operating in the working device. In this regard, the work presented in this doctoral thesis is directed to two branches of organic electronics that are at present deeply debated in the field: molecular doping and organic photovoltaics (OPV). The combination of high spatial resolution characterization techniques was employed with the aim of correlating the morphological traits of the investigated donor-acceptor films with their electronic properties and, in some cases, with the device performance. The first part of the work focuses on the p-type doping of pentacene (PEN) thin film with C60F48. We performed a systematic characterization of the heterojunction formed when evaporating C60F48 on PEN. The influence of the morphology of PEN films with varying thickness on the dopant growth was revealed by a detailed atomic force microscopy (AFM) study, supported by x-ray photoelectron emission microscopy (XPEEM). The repercussions on the local surface work function were determined by Kelvin probe microscopy (KPFM), that demonstrated strong charge transfer between the two molecules but evidencing significant local heterogeneities depending on the film morphology. Further inspection of the electronic properties of the system was carried out by employing photoemission spectroscopy (PES), that allowed to define the energetics and build the energy diagram level of the formed interface. The doping effect of C60F48 was further proven in a PEN-based organic field effect transistor (OFET), by performing an experiment where we evaluated in-situ the improvement of the OFET characteristics upon doping. The characterization of the system was completed by exploring the structural properties of heterojunctions with different architectures. The investigation, based on grazing incidence x-ray diffraction (GIXD), evidenced substantial structural differences depending on the design of the heterojunction. The second part of the thesis aims to unravel the morphology-performance relationship in OPV devices based on non-fullerene acceptors (NFAs). Specifically, we consider two NFAs that only differ in the design of the side-chains. The effects of the different structural evolution of the two NFAs upon thermal annealing on the device performance were examined by performing in-situ grazing incidence wide-angle x-ray scattering (GIWAXS) analysis and complementing with AFM topographical survey. The different thermotropic behaviour of the two NFAs and the considerable consequences on the photovoltaic efficiency are discussed, highlighting the important role played by polymorphism in this class of systems.Peer reviewedCSIC - Instituto de Ciencia de Materiales de Barcelona (ICMAB)Universidad Autónoma de BarcelonaBarrena, EstherPellicer, EvaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222021info:eu-repo/semantics/doctoralThesishttp://purl.org/coar/resource_type/c_db06application/pdfhttp://hdl.handle.net/10261/267402reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2674022026-05-22T06:33:51Z
score 15.81155

Similares en LA Referencia