|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
IJPAP Vol.44(01) [January 2006] >
| 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) |
| Source: | IJPAP Vol.44(01) [January 2006]
|
|
