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  • 1
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 94 (1972), S. 7970-7975 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Accident Analysis and Prevention 20 (1988), S. 39-51 
    ISSN: 0001-4575
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Architecture, Civil Engineering, Surveying , Psychology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 2670-2676 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Studies of interface formation on conventional semiconductor materials are typically carried out under relatively pristine conditions. However, for devices based on the use of electronic polymers there is also compelling interest in exploring the variations in contact behavior that might result under realistic manufacturing conditions like multilayer device assembly based on solution coating technology. Small molecule doped polymers (MDPs) developed principally as large area coatings for electrophotographic use are now finding wider device applications. These polymers are insulators capable of transporting excess injected charge with a unipolar drift mobility which can be tuned over a wide range by varying the concentration of transport active species. Most significant in the present context, MDPs can be rendered trap free by molecular design. These unique characteristics of MDPs make it possible to analyze the relative injection efficiencies of their interfaces with various contacts simply by a direct comparison of current–voltage characteristics with time of flight drift mobility measurements carried out on the same film coatings. In this way, and apart from their intrinsic interest and practical value, MDPs and closely related polymeric media provide the ideal venue for the study of contact phenomena on molecular solids. Almost all the present measurements were carried out by measuring dark hole injection from various preformed metal substrates into the MDP film TPD/polycarbonate. Under these circumstances it was found that while injection efficiency nominally scaled with the estimated interfacial energy step there was significant variance that in some cases could be clearly associated with the specific details of interfacial chemistry. For one exceptional case where Au was evaporated on the free surface of an already cast film a time and temperature dependent contact forming process could be delineated in which the interface systematically evolved from emission limited to ohmic. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 77 (1973), S. 987-990 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 1038-1046 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dark decay of open-circuit surface voltage on a composition series of capacitively charged a-Se-Te films has been analyzed. The bulk process controlling dark decay is demonstrated to be thermal emission of holes from discrete states deep in the mobility gap. The hole sweepout process causes the progressive development of negative deeply trapped space charge in the bulk which is experimentally manifested in the distinct shape of the associated dark discharge curves. The rate of dark discharge and the detailed shape of the dark decay function dV/dt vs t vary systematically with alloy composition. Phenomenological parameters of the dark decay can be related to an underlying Gaussian emission center distribution in the gap by numerical simulation techniques. It is demonstrated that progressive Te addition to the binary alloy broadens this distribution and shifts it toward the valence-band mobility edge.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1127-1129 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The extent to which transport behavior can be simply correlated with the macroscopic dielectric properties of a transport polymer is explored by employing a "vapor doping'' procedure as a means of reversibly varying its bulk dielectric properties. Under controlled uptake and subsequent outgassing of polar CH3CN vapor, the hole drift mobility of the transport polymer PTPB is monitored, while its relative dielectric constant is reversibly varied between ε=3.7, its undoped value, and ε=6.0, its saturation value at room temperature. There is neither an associated change in hole drift mobility nor in the dispersion of injected carrier transit times. When the same procedure is carried out on a closely related molecularly doped polymer TPD in polycarbonate, an increase in dispersion is clearly indicated but the transit time of the fastest carriers remains unaffected.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 3167-3169 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe photoinduced charge transfer process in a bilayer device comprised of poly(p-phenylene vinylene) (PPV) layer and a trap-free molecularly doped polymer containing diaryldiamine (TPD) dispersed in polycarbonate (PC). The time resolved charge transfer from PPV to TPD:PC in the presence of an electric field is analyzed. The injection (transfer) efficiency of the photoinduced holes from PPV into TPD:PC is about 25% holes/photons at electric fields at 4×105 V/cm or higher. Minimal trapping of photocarriers at the interface region between the two polymer layers is associated with this transfer.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1288-1290 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the steady-state current supported by a variety of contacts on a polytetraphenylbenzidine hole transport polymer. When glassy carbon is used as a hole injecting contact to the polymer, the current is found to exhibit prototypical emission limited behavior. Unique features of the electric field and temperature dependence of the emission limited current cannot be explained by injection theories appropriate to conventional band type semiconductors. A model of thermally assisted tunneling from carriers at the Fermi level of the contact to localized states in the polymer has been formulated. This model is able to critically account for key features in the experimental data. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2030-2032 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to estimate the deep-trapping mobility-lifetime (μτ) product for holes and electrons in poly(p-phenylene vinylene) (PPV), trap-free space-charge-limited current, and time-of-flight measurements were performed on bilayer devices comprising of a PPV layer and a trap-free molecularly doped polymer layer. μτ products of about 10−9 and 10−12 cm2/V were found for holes and electrons respectively, corresponding to an average range of 1 μm for holes and 10 A(ring) for electrons under an electric field of 105 V/cm. The low μτ value for electrons is attributed to severe deep trapping of electrons in PPV, which effectively reduces their range. Implications on the efficiency of electroluminescence devices are discussed. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
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