PHOTOELECTROCHEMICAL AND ELECTROREFLECTANCE STUDY OF ORGANIC SEMICONDUCTORS.
Item
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Title
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PHOTOELECTROCHEMICAL AND ELECTROREFLECTANCE STUDY OF ORGANIC SEMICONDUCTORS.
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Identifier
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AAI8611373
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identifier
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8611373
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Creator
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PERAMUNAGE, DHARMASENA.
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Contributor
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Micha Tomkiewicz
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Date
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1986
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Analytical
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Abstract
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Techniques, that are traditionally used to study Semiconductor/Electrolyte interface of Inorganic Semiconductors, such as Electrolyte Electroreflectance (EER), Photocurrent Spectroscopy and Impedance spectral Analysis, were used to study the Organic Semiconductor/Electrolyte Interface. Even though one expects complications arising from the special topology of the space charge layer within the fibre and the possibility of the film, undergoing chemical changes in aqueous electrolyte, we could still extract useful data specific for this interface.;EER of lightly doped Polyacetylene has two peaks. One at 1.45 ev and other at 1.55 ev. These peaks were assigned tentatively, to an excitonic transition and direct band to band transition. EER of Neutral Poly-3methylthiophene (P3MT) has one peak at 2.05 ev, which could be fitted to a third derivative lineshape expected from lowfield EER. Lineshape corresponds to a bandgap value of 2.1 ev, and it confirms the quasi one dimensionality of the polymer. EER of moderately doped P3MT showed an additional structure, which could be correlated to a polaron level 0.15ev below the conduction band. EER of both trans -(CH)(,x) and P3MT showed evidence for firmi level pinning.;Relaxation spectra of moderately doped P3MT shows a flat band of about 0.7 v vs.SCE. Trans -(CH)(,x) and neutral P3MT gave Impedance spectra which could not be analysed in terms of frequency independent passive elements.;The action spectra observed for trans -(CH)(,x) and P3MT were analysed, in terms of the Gartner model. Both polymers were shown to be direct gap semiconductors. The deposition of Pt improved the photoresponse with the maximum somewhere around 2 x 10('-7)mol/cm('2).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Chemistry
