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  • 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:
    , 126(19):194503–194503, 2007. iii iv electrophoresis experiments designed to track the movement of

  • 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:
    -spring system and can be described using Hooke’s Law. (See figure 2.1) Fs = −ks~r Here ks is the force

  • 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:
    the bandgap. This state decays within the first ∼100 fs after excitation, into a ground state

  • On the photoresponse of several novel oligoacene and anthradithiophene derivatives

    Creator:
    Day, Jonathan
    Abstract:
    The results of an investigation into carrier dynamics in several novel functionalized and solution-processable pentacene and anthradithiophene derivatives are reported. Measurements were made of real-time photoresponse of polycrystalline thin films of these materials to ultrafast laser pulses, on picosecond to microsecond time-scales, as well as measurements of dark current and...
    Resource Type:
    Dissertation
    Full Text:
    plate; WP: Wollaston prism; and BD: balanced detector. (b) Single-scan THz trace (FWHM 250 fs) and (c

  • (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:
    Femtosecond Transient Absorption (fs-TA) Spectroscopy....... 62 5.2.7 Measurements of (Opto)electronic

  • 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:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 4.28 P(t) for on+off times for Pn-F8-TIPS in a PMMA host plotted in green. In black, fit data

  • 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:
    -plane momentum compared with the dispersion of incident free space (FS) external fields at different

  • 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

  • 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:
    calculated trap efficiency Q ............................................126 LIST OF FIGURES

  • 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:
    terms of photophysics, TIPS–Pn films exhibit ultrafast (< 100 fs) SF, depending on film morphology[27