Aqueous precipitation and electrical properties of In2S3: characterization of the In2S3/polyaniline and In2S3/polypyrrole heterojunctions
Identifieur interne : 000284 ( Main/Exploration ); précédent : 000283; suivant : 000285Aqueous precipitation and electrical properties of In2S3: characterization of the In2S3/polyaniline and In2S3/polypyrrole heterojunctions
Auteurs : RBID : ISTEX:10853_1993_Article_BF00367815.pdfAbstract
The stability of indium sulphide aqueous supersaturated solutions at pH 2.50 and 25°C was investigated. Spontaneous precipitation proceeded at rates proportional to the solution supersaturation via a polynuclear mechanism and the phase formed was identified as In2S3. The absorption spectrum of In2S3 was measured from 190–800 nm and from the absorption threshold the optical energy gap was estimated to be E0 = (1.8 ± 0.1) eV. The thermal energy gap Et = (1.6 ± 0.2)eV was determined from resistivity against temperature measurements and a thermopower coefficient S = −100μVK−1 at room temperature was found. Finally, In2S3/polyaniline and In2S3/polypyrrole heterojunctions were prepared and from the investigation of their I–V characteristics, the values of the ideality factor, n, the saturation current density, J0, and the effective barrier height, ϕB, were determined to be n = (15 ± 2), J0 = (38 ± 7) A m−2 and ϕB = 0.56 eV for the polyaniline and n = (64 ± 8), J0 = (13 ± 2) A m−2 and ϕB = 0.59 eV for the polypyrrole heterojunction.
DOI: 10.1007/BF00367815
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<front><div type="abstract" xml:lang="eng">The stability of indium sulphide aqueous supersaturated solutions at pH 2.50 and 25°C was investigated. Spontaneous precipitation proceeded at rates proportional to the solution supersaturation via a polynuclear mechanism and the phase formed was identified as In2S3. The absorption spectrum of In2S3 was measured from 190–800 nm and from the absorption threshold the optical energy gap was estimated to be E0 = (1.8 ± 0.1) eV. The thermal energy gap Et = (1.6 ± 0.2)eV was determined from resistivity against temperature measurements and a thermopower coefficient S = −100μVK−1 at room temperature was found. Finally, In2S3/polyaniline and In2S3/polypyrrole heterojunctions were prepared and from the investigation of their I–V characteristics, the values of the ideality factor, n, the saturation current density, J0, and the effective barrier height, ϕB, were determined to be n = (15 ± 2), J0 = (38 ± 7) A m−2 and ϕB = 0.56 eV for the polyaniline and n = (64 ± 8), J0 = (13 ± 2) A m−2 and ϕB = 0.59 eV for the polypyrrole heterojunction.</div>
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<abstract lang="eng">The stability of indium sulphide aqueous supersaturated solutions at pH 2.50 and 25°C was investigated. Spontaneous precipitation proceeded at rates proportional to the solution supersaturation via a polynuclear mechanism and the phase formed was identified as In2S3. The absorption spectrum of In2S3 was measured from 190–800 nm and from the absorption threshold the optical energy gap was estimated to be E0 = (1.8 ± 0.1) eV. The thermal energy gap Et = (1.6 ± 0.2)eV was determined from resistivity against temperature measurements and a thermopower coefficient S = −100μVK−1 at room temperature was found. Finally, In2S3/polyaniline and In2S3/polypyrrole heterojunctions were prepared and from the investigation of their I–V characteristics, the values of the ideality factor, n, the saturation current density, J0, and the effective barrier height, ϕB, were determined to be n = (15 ± 2), J0 = (38 ± 7) A m−2 and ϕB = 0.56 eV for the polyaniline and n = (64 ± 8), J0 = (13 ± 2) A m−2 and ϕB = 0.59 eV for the polypyrrole heterojunction.</abstract>
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