Abstract
Efficient photocathodes made of polymorph monoclinic and orthorhombic CuNb2O6 thin films was prepared by PLD technique (248 nm, 5 Hz, 525 mJ/cm2, (30 °C, 100 °C, 200 °C, 400 °C, 600 °C). Desired phase formation was confirmed from XRD peak corresponding to (1‾31) and (131) (d = 2.975 Å and d = 2.919 Å) of m-CuNb2O6 and (311) (d = 2.939 Å) of o-CuNb2O6 plane. Morphological analysis exposes transformation of cubic into truncated cubes in m-CuNb2O6 and polyhedron to spherical particles in m-CuNb2O6 thin films. Using CuNb2O6, p-DSSC was fabricated (CNO/N719/I−/I3−/Pt) and their efficiency was tested. Photovoltaic cell exhibited device performance of m-CuNb2O6 (0.24%) and o-CuNb2O6 (0.22%). Higher photovoltaic performance of o-CuNb2O6 (600 °C) photocathode DSSC arises due to various factors like dense, continuous surface with well-connected morphology, higher dye loading, NIR light harnessing capability and higher photoconversion efficiency. PLD deposited CuNb2O6 provides a new insight in the DSSCs application.
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