Tóm tắt

Efficient photocathodes made of polymorph monoclinic and orthorhombic CuNb2O6 thin films was prepared byrnPLD technique (248 nm, 5 Hz, 525 mJ/cm2, (30 ◦C, 100 ◦C, 200 ◦C, 400 ◦C, 600 ◦C). Desired phase formationrnwas confirmed from XRD peak corresponding to (131) and (131) (d = 2.975 Å and d = 2.919 Å) of m-CuNb2O6rnand (311) (d = 2.939 Å) of o-CuNb2O6 plane. Morphological analysis exposes transformation of cubic intorntruncated cubes in m-CuNb2O6 and polyhedron to spherical particles in m-CuNb2O6 thin films. Using CuNb2O6,rnp-DSSC was fabricated (CNO/N719/I− /I3 − /Pt) and their efficiency was tested. Photovoltaic cell exhibited devicernperformance of m-CuNb2O6 (0.24%) and o-CuNb2O6 (0.22%). Higher photovoltaic performance of o-CuNb2O6rn(600 ◦C) photocathode DSSC arises due to various factors like dense, continuous surface with well-connectedrnmorphology, higher dye loading, NIR light harnessing capability and higher photoconversion efficiency. PLDrndeposited CuNb2O6 provides a new insight in the DSSCs application.