Development of Molybdenum Trioxide (MoO3) by Spin Coating Method for Photovoltaic Application

Abstract

Molybdenum trioxide (MoO 3 ), thin films have been deposited on glass substrates by spin-coating method using ammonium heptamolybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 ·4H 2 O ) as a single source precursor of Mo and O. They were subjected to atmospheric heat treatment at different temperatures (200, 400 and 500 °C). MoO 3 thin films obtained were characterized using X-ray diffraction techniques (XRD), scanning electron microscopy (SEM), energy dispersed spectroscopy (EDS) and integrating sphere. The XRD patterns of annealed films show the formation of ΜοΟ 3 in a polycrystalline phase, formation of MoO 3 was also confirmed by EDS. The SEM photographs show that the thin films obtained are in layer-type structure and their grains size increases with increasing of annealing temperatures. The measurement results of integrating sphere show that the MoO 3 thin film prepared at 500 °C transmit about 72% and reflect about 12% of the visible spectrum.