It was found that the photophysical characteristics of film composites based on poly(vinyl butyral) with additions of particles of the hetero-polyoxometalate complex (NH4)5{[Cu(en)2][PMo8V4O40]}·9H2O have an unusual dependence on the duration of illumination with visible light, which is expressed as change in the sign of the photocurrent during long-term illumination. It is suggested that the negative photoconductivity is due to the formation of significant volume charge in the volume of the composite film. It was concluded from analysis of the photovoltaic characteristics that the volume charge is formed by non-equilibrium negative electric charges. A phenomenological model that describes the observed effect is proposed.
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Translated from Teoreticheskaya i Éksperimental’naya Khimiya, Vol. 52, No. 1, pp. 9-13, January-February, 2016.
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Davidenko, N.A., Kokozay, V.N., Davidenko, I.I. et al. Photoconducting Characteristics of Films of Poly(Vinyl Butyral)/Hetero-Polyoxometalate Composite. Theor Exp Chem 52, 10–15 (2016). https://doi.org/10.1007/s11237-016-9443-0
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DOI: https://doi.org/10.1007/s11237-016-9443-0