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Filtering by: Creator Ray, R. D. Remove constraint Creator: Ray, R. D. Advisor Ostroverkhova, Oksana Remove constraint Advisor: Ostroverkhova, Oksana Degree Level Bachelor's Remove constraint Degree Level: Bachelor's

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  • 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:
    with the Pn-R-F8 derivatives whose D/A LUMO o�set is approximately 0.55 eV, an optimal value for small

  • 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:
    opposed to those with smaller D-A separations. 15 References [1] Tracey M. Clarke and James R

  • 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:
    Trapping 5 2.1 Geometric (ray) Optics Model: Mie Regime (d��) . . . . . . 5 2.2 Rayleigh Regime (d

  • Fungal Photonics

    Creator:
    Spafford, Jasper
    Abstract:
    The spalting fungus Scytalidium cuboideum secretes a red pigment that produces naphthoquinonic crystals that are a photonic material candidate. The molecule can pack together in different configurations resulting in amazingly different optical properties. I developed a procedure (slowly evaporating the solvent) to preferentially grow two of these configurations, which have...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    ............................................................................................................................5 X-ray diffraction

  • Optoelectronic Properties of a Novel Fungi-derived Pigment

    Creator:
    Wiesner, Cameron
    Abstract:
    In industry, there is considerable interest in finding sustainable, renewable materials for use in electronic devices. Pigments derived from spalting fungi are of particular interest due to their longevity in diverse environmental conditions. The focus of my project was to characterizethe properties of a novel, fungi-derived pigment, and to discover...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    Acknowledgments I would like to thank Dr. Seri Robinson and PhD student Ray Van Court for their continued

  • Optical Tweezers-Based Probe of Charge Transfer in Organic Semiconductors at Microscopic Scales

    Creator:
    Busche, Jacob A.
    Abstract:
    A method for measuring the (dis)charging dynamics of organic semiconductors with single-electron resolution in multiple environments is developed using optical tweezers. A 1μm silica bead was coated with either a pristine organic semiconductor or an electron donor-acceptor blend, trapped using optical tweezers, and driven with an oscillating electrical driving force....
    Resource Type:
    Honors College Thesis
    Full Text:
    light directed by the bead is returned as an equal and opposite force to the bead: d~pdt = ∑ ~F , where

  • Modeling optical reflection and electric field intensity in organic semiconductor microcavities

    Creator:
    Munk, Rebecca
    Abstract:
    Organic semiconductors are a promising alternative to the traditional inorganic semiconductors, such as silicon. Organics are solution-processable, low-cost, sustainable, and have interesting optoelectronic properties. One such property is the formation of exciton-polaritons, quantum quasi-particles formed by an electron-hole pair in the semiconductor and a photon. This process can be induced...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    refractive index is given by 𝑛 = ε 𝑟 µ 𝑟 . (1.3.2.1) Most of the time, the refractive index is treated

  • The interaction of bulk heterojunction donor/acceptor blends with polaritonic state creation in organic crystalline films

    Creator:
    Center, Reid
    Abstract:
    We explore the interactions between charge transfer exciton states (CTEs) and an optical microcavity by testing the effects that cavity resonance has on the CTEs and if CTEs can be coupled with a photon to create quasiparticles known as polaritons. Exciton polaritonics is becoming a booming area of research mainly...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    . [7] Ellis, D. S.; Hill, J. P.; Wakimoto, S.; Birgeneau, R. J.; Casa, D.; Gog, T.; Kim, Young-June

  • Organic Semiconductors : Incorporating Xylindein into (Opto)Electronic Devices

    Creator:
    Rath, Jeremy J.
    Abstract:
    This research investigates the electronic properties of a fungi-derived pigment, xylindein as a novel sustainable material for organic electronics. Xylindein molecules were characterized in solution and in film. Absorption spectra and (photo)luminescence spectra were taken at various excitation wavelengths. Xylindein’s molecular properties were computed with the Gaussian 09 software suite....
    Resource Type:
    Undergraduate Thesis
    Full Text:
    . D. Dimitrov and J. R. Durrant, “Materials Design Considerations for Charge Generation in Organic

  • Study of Organic Semiconductors Using Time-Resolved Charge Measurements at the Microscale

    Creator:
    Wallace, Richard
    Abstract:
    Understanding charge transfer in organic semiconductors is important for developing devices like organic light emitting diodes and flexible electronics. Optical tweezers have been used in many disciplines for trapping, manipulating, and analyzing microscopic objects such as microspheres, micro-organisms, and other colloidal particles. Using optical tweezers, studies have measured the average...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    semiconductors. 1.2 Donor-Acceptor Semiconductors In optoelectronics, donor-acceptor (D/A) composites are