Structure and dynamics of poly(9,9-dioctylfluoren-2,7-diyl-co-benzothiadiazole) (F8BT) and correlations with its electrical properties
Structure and dynamics of poly(9,9-dioctylfluoren-2,7-diyl-co-benzothiadiazole) (F8BT) and correlations with its electrical properties
The PHD project has two main goals. The first one is specifically related to investigations on molecular dynamics, structural conformations and packing of polyfluorene-based polymers. For this purpose, Wide Angle X-Ray Diffraction (WAXD), Solid-State Nuclear Magnetic Resonance (NMR) and Dynamical-Mechanical Thermal Analysis (DMTA) are being used as the main techniques. The second goal is to correlate molecular phenomena, as characterized in the first part, with opto-electronic properties of polyfluorene when used as active layer in an electronic device, such as a Polymer Light-Emitting Diode (PLED). In the second part, fabrication of devices and their electrical characterization as a function of temperature are the main objectives. Impedance Spectroscopy, Current-Voltage characterization of the devices and Time-Of-Flight (TOF) techniques are among the main techniques to be used in the second part of the project. Therefore, the project combines fundamental studies on molecular dynamics with technological performance of organic electronic.
Der erste Teil der Arbeit befasst sich mit der Untersuchung der molekularen Dynamik und Konformation sowie der molekularen Packung von Polyfluoren-basierten Polymerschichten. Die hauptsächlich verwendeten Analysemethoden waren die Röntgenweitwinkelbeugung (WAXD), die Festkörper-NMR und die dynamisch-mechanische Analyse (DMTA). In dem zweiten Teil der Arbeit wurden polymere Leuchtdioden (PLEDs) mit einem Polyfluorenderivat als Funktionsschicht hergestellt und deren optoelektronische Eigenschaften charakterisiert. Dazu wurden temperaturabhängige Strom-Spannungs-Kennlinien, Impedanzmessungen und Beweglichkeitsmessungen durchgeführt. Das Hauptziel der vorliegenden Arbeit war es, Korrelationen zwischen den molekularen Phänomenen, die im ersten Teil der Arbeit identifiziert wurden, und den Eigenschaften der PLEDs, die im zweiten Teil ermittelt wurden, zu finden.
O projeto de doutorado entitulado “Correlação das Propriedades Óticas e Elétricas com a Estrutura Física e Dinâmica Molecular de Filmes e Dispositivos de Polifluorenos e Derivados” apresenta duas etapas. A primeira é especificamente ligado a investigação da dinâmica molecular, conformação estrutural e empacotamento de polímeros derivados do polifluoreno. Para isso, Difração de Raio-X de Alto Ângulo (WAXD), Ressonânica Magnética no Estado Sólido (RMN) e Análise Térmica Dinâmico Mecânica (DMTA) serão utilizadas como técnicas principais. A segunda é oa de correlacionar, os fenômenos observados na primeira parte do projeto, com as propriedades opto-eletrônicas dos filmes poliméricos sendo utilizados como camada ativa em dispositivos eletrônicos do tipo Diodo Polimérico Emissor de Luz (PLED). Nesta segunda parte, a fabricação dos dispositivos e sua caracterização como função da temperatura serão os principais objetivos. Espectroscopia de Impedância, Corrente-Voltagem, Tempo de Vôo (TOF) e Photo-CELIV serão as principais técnicas de caracterização utilizadas. Dessa forma, o projeto combina estudos fundamentais de aspectos moleculares com o desempenho tecnológico de dispositivos optoeletrônicos.
The PHD project has two main goals. The first one is specifically related to investigations on molecular dynamics, structural conformations and packing of polyfluorene-based polymers. For this purpose, Wide Angle X-Ray Diffraction (WAXD), Solid-State Nuclear Magnetic Resonance (NMR) and Dynamical-Mechanical Thermal Analysis (DMTA) are being used as the main techniques. The second goal is to correlate molecular phenomena, as characterized in the first part, with opto-electronic properties of polyfluorene when used as active layer in an electronic device, such as a Polymer Light-Emitting Diode (PLED). In the second part, fabrication of devices and their electrical characterization as a function of temperature are the main objectives. Impedance Spectroscopy, Current-Voltage characterization of the devices and Time-Of-Flight (TOF) techniques are among the main techniques to be used in the second part of the project. Therefore, the project combines fundamental studies on molecular dynamics with technological performance of organic electronic