Quantum Efficiency (Φ) Enhancement of p-CuI Sensitized LB Films of Methylviolet-C18 by Minimizing Dye Aggregates

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dc.contributor.authorKarunarathna, P. G. D. C. K.
dc.contributor.authorFernando, C. A. N.
dc.contributor.authorDe Silva, S. N. T.
dc.date.accessioned2022-02-08T04:51:35Z
dc.date.available2022-02-08T04:51:35Z
dc.date.issued2015
dc.description.abstractIt is well known that the spectral response of wide band gap semiconductor materials can be extended to the visible region by deposition of suitable dyes on the surface (Senadeera et al., 2005; Fernando et al., 2013). In addition to the adustability of the spectral response, dye sensitized solar cells have several advantages (Kubo et al., 2002). The dye sensitized photocurrent is rather insensitive to the impurites and the defects of the semiconductor. When dyes with intense absorption bands are deposited, the light absorption at the sensitized surface becomes much higher than a bare semiconductor surface. Although the absorption properties of the dye increases with the concentration of the absorbed dye on the semiconductor surface, a dye sensitized photocurrent enhacement cannot be observed with the increase of the number of dye molecules on the semicondutor because of the energy dissipative proceses of the excited states of the dye and the recombination of photogenerated charge carriers (Fernando et al., 1994). Methodology Commercially available well cleaned copper sheets (1cmx3cm) were used to deposit p-CuI nano thin films from the following method. A solution of CuI was prepared by dissolving 5mg of CuI in 10ml of moisture free acetonitrile. CuI colloidal solution was lightly spread on the well cleaned copper surface until forming a thickness ≈ 5.0 µm to prepare Cu/p-CuI photoelectrodes. Cu/p- CuI photoelectrodes were used to deposit LB films. Experimental set up used for LB deposition is shown in the Fig.1 (Fernando et al., 2013). 2M KI and 1x10 M NaH2PO4- Na2HPO4 pH=6 buffer solution was used as the electrolyte. AFM pictures of the samples were obtained using a Park’s AFMXE-70 Instrument. Photocurrent quantum efficiency (Ф%) was calculated using the following equation, Ф% = [number of electrons created / number of photons incident]x100%en_US
dc.identifier.isbn9789550481088
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/8305/24-MRT-Quantum%20Efficiency%20%28%ce%a6%29%20Enhancement%20of%20p-CuI%20Sensitized%20LB%20.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.subjectMineral Sciencesen_US
dc.subjectMaterials Sciencesen_US
dc.subjectScience and Technologyen_US
dc.subjectElectronic Engineeringen_US
dc.subjectNano Materials & Nanotechnologyen_US
dc.titleQuantum Efficiency (Φ) Enhancement of p-CuI Sensitized LB Films of Methylviolet-C18 by Minimizing Dye Aggregatesen_US
dc.title.alternativeResearch Symposium 2015en_US
dc.typeOtheren_US
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