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Filtering by: Creator Bratsch, Anthony D. Remove constraint Creator: Bratsch, Anthony D. Contributor advisor sim Ostroverkhova, Oksana Remove constraint Contributor advisor sim: Ostroverkhova, Oksana

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  • Exciton and Polariton Nature in Organic Crystals

    Creator:
    Van Schenck, Jonathan D. B.
    Abstract:
    Understanding the impact of inter-molecular orientation on the optical proper-ties of organic semiconductors is important for designing next-generation organic (opto)electronic and photonic devices. However, fundamental aspects of how various features of molecular packing in crystalline systems determine the nature and dynamics of excitons have been a subject of debate. Toward...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Jonathan D. B. Van

  • Low temperature microscopy of organic optoelectronic materials

    Creator:
    Thieme, Mattson
    Abstract:
    We present a report on a new capability for low temperature microscopy of organic optoelectronic semiconductor materials. We may now perform photoluminescence (PL) and conductivity measurements as a function of temperature on a microscopic level. Testing confirmed the setup's ability to support microscopic measurements at pressures of 10^-6 Torr and...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    - tained including PL, of single crystals as well as donor-acceptor (D/A) spincast �lms, and images of

  • Exploration of charge-transfer exciton formation in organic semiconductors through transient photoconductivity measurements

    Creator:
    Neunzert, Afina
    Abstract:
    This project investigated transient photoconductivity in organic donor-acceptor (D-A) systems, where a flourinated anthradithiophene, ADT-TES-F, acts as the donor. Various acceptor molecules were used, with different sidegroups, and different HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy level offsets relative to the acceptor. Thin film composites...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    -acceptor (D- A) systems, where a �ourinated anthradithiophene, ADT-TES-F, acts as the donor. Various

  • Optical Tweezer Trapping of Colloidal Polystyrene and Silica Microspheres

    Creator:
    Peters, Kyle C.
    Abstract:
    Optical trapping is a tool used throughout a wide variety of disciplines rang- ing from precisely probing and manipulating sub-micron organisms in biol- ogy to analyzing fundamental charge transfer in colloidal physics. This thesis presents research involving optical tweezer force measurements of polystyrene and silica microspheres. In addition, preliminary work...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    varying electric-field frequencies. 2S. H. Behrens and D. G. Grier. The charge of glass and silica

  • Photostability of organic semiconductors : from bulk to nanoscales

    Creator:
    Quist, Nicole Arianne
    Abstract:
    Organic semiconductors have attracted considerable attention due to their applications in low-cost, solution-processable (opto)electronic devices. An important class of high-performance organic semiconductors is pentacene derivatives, which exhibit high charger carrier mobilities in field-effect transistors and ultrafast singlet fission in photovoltaic devices. These derivatives have served as benchmark materials for systematic...
    Resource Type:
    Dissertation
    Full Text:
    formation depending on the host matrix. This was also compared to single Pn donor (D) molecules that were

  • (Opto)electronic Properties of Xylindein and Organic (Opto)electronic Devices

    Creator:
    Giesbers, Gregory J.
    Abstract:
    Organic semiconductors are of interest for (opto)electronic applications due to their low cost, solution processability, and tunable properties. Natural product-derived organic pigments have attracted attention due to their extraordinary environmental stability and unexpectedly good optoelectronic performance, in spite of only partially conjugated molecular structures. Fungi-derived pigments are a naturally sourced,...
    Resource Type:
    Dissertation
    Full Text:
    in donor- acceptor (D-A) bulk heterojunction (BHJ) solar cells. Fullerenes are the most common

  • Light-matter interactions : from the photophysics of organic semiconductors to high spatial resolution optical tweezer-controlled nanoprobes

    Creator:
    Kendrick, Mark J.
    Abstract:
    Studies of light-matter interactions in organic semiconductors and in optical tweezer trapping of nanoparticles are presented. In the research related to organic semiconductor materials, a variety of novel materials and their composites have been characterized, and physical mechanisms behind their optoelectronic properties have been established. Three novel functionalized hexacene derivatives...
    Resource Type:
    Dissertation
    Full Text:
    6.2.2 Geometrical Optics Regime (d>>) .............................................................108

  • Optoelectronic properties of organic semiconductor materials : from bulk to single molecule

    Creator:
    Shepherd, Whitney E. B.
    Abstract:
    The behavior and application of organic semiconductor materials depend strongly on their molecular structure, and molecular interactions. Several studies of intermolecular interactions in functionalized polyacene materials are presented. The degree and onset of aggregation of a functionalized anthradithiophene derivative was studied as a function of concentration in two different host...
    Resource Type:
    Dissertation
    Full Text:
    -TES-F/t-bu BTBTB films at two concentrations (D(2%) and D(0.02%)) under 355 nm excitation. Solution

  • Electronic and Optical Properties of Organic Semiconductors : Experiment and Simulation

    Creator:
    Johnson, Brian
    Abstract:
    The continued development of organic semiconductor materials relies on an understanding of the relationship between optoelectronic properties, molecular structure, and molecular interaction. Several detailed studies of electronic properties in functionalized polyacene materials are presented. A computational model which allows the extraction of charge generation and transport properties from experimental data...
    Resource Type:
    Dissertation
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.3.2 Intensity Dependence . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 3.4 D/A

  • Photophysics of organic semiconductors at the nanoscale

    Creator:
    Grollman, Rebecca R.
    Abstract:
    Organic semiconductors are used in a wide variety of applications including transistors,solar cells, and light emitting diodes. These materials are solution-processable,low cost, and tunable. Many successful organic optoelectronic materials utilizeblends of several types of molecules (such as donors and acceptors) in order topromote charge generation. As blends are an inherently...
    Resource Type:
    Dissertation
    Full Text:
    with a constant acceptor concentration (IF- TIPS, 5 nm). (d) The top time trace represents a