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Title: Structural, optical, electrical and photovoltaic electrochemical studies of cobalt molybdate thin films
Authors: Pandey, P K
Bhave, N S
Kharat, R B
Keywords: Cobalt molybdate thin films;Spray pyrolysis;Optical absorption;dc electrical conductivity
Issue Date: Jan-2006
Publisher: CSIR
IPC Code: H01C17/1075, G01R
Abstract: The deposition of cobalt molybdate (CoMoO4) thin film by spray pyrolysis (SP) process, using its ammoniacal solution as precursor, has been presented. The growth of the film takes place by pyrolytic decomposition of the spraying precursor solution onto the preheated glass substrates. X-ray diffraction (XRD) studies confirm the microcrystalline, single-phase nature of the sintered thin films. Scanning electron microscope (SEM) images clearly show the aggregate of crystallites of dimensions 1-5 mm. The optical absorption studies of the sintered thin films in the wavelength range 350 - 850 nm show direct as well as indirect optical transitions in the material. The direct and indirect band gap values found to be 1.75 and 1.40 Ev, respectively. The films are semiconducting in nature and highly resistive at room temperature as evident from their dc electrical conductivity measurements obtained by the two point probe method in the temperature range 300 - 500 K. Plot of log(σ) versus 1/T clearly indicates a break in the curve corresponding to the temperature 345 K. The thin films of CoMoO4 deposited on FTO coated conducting glass substrate were sintered in hydrogen atmosphere to be used as photoanode in photovoltaic electrochemical (PVEC) cell. The PVEC cell configuration is: CoMoO4 | Ce4+, Ce3+ | Pt; 0.1 M in 0.1 N H2SO4. The PVEC characterization reveals the fill factor and power conversion efficiency to be 0.431 and 1.20%, respectively. The flat band potential has been found to be – 0.32 V versus Standard calomel electrode (SCE).
Page(s): 52-58
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.44(01) [January 2006]

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