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Kulkarni A.,PSGVPMs ASC College | Arote S.,University of Pune | Pathan H.,University of Pune | Naushad M.,King Saud University | Patil R.,PSGVPMs ASC College
Indian Journal of Physics | Year: 2016

The present study demonstrates the chemical bath deposition of Bi2S3 over previously prepared porous photoanode of SnO2 for solar cell fabrication. Deposition of Bi2S3 onto SnO2 photoanode is carried out at 27 °C for 30, 60 and 120 m, showing structural modification and different Bi/S ratio with increase in deposition time. An enhancement in the optical absorbance is observed as a function of deposition time. The best photovoltaic performance is observed for the deposition time of 30 m. The obtained photovoltaic performance is correlated with the structural, optical and elemental analysis of the sensitized photoanodes, finding a qualitative role of recombination resistance in determining the photoconversion performance. © 2016, Indian Association for the Cultivation of Science.

Kulkarni A.N.,PSGVPMs ASC College | Arote S.A.,University of Pune | Pathan H.M.,University of Pune | Patil R.S.,PSGVPMs ASC College
Materials for Renewable and Sustainable Energy | Year: 2015

The study deals with the sensitization of the porous SnO2 films deposited on fluorine-doped tin oxide with nanocrystalline Sb2Se3. The sensitization was achieved for three different sensitization times employing chemical solution deposition with antimony chloride and sodium selenosulphate as precursors for Sb3+ and Se2-, respectively. The unsensitized and sensitized photoelectrodes were characterized using X-ray diffractometry, scanning electron microscopy and diffused reflectance spectroscopy. The solar cells fabricated using three different photoelectrodes were characterized for their photovoltaic performance using the photocurrent density versus photovoltage curves. The study revealed that sensitization time significantly influences the photovoltaic parameters namely, short circuit current density (J sc), open circuit voltage (V oc) and fill factor (FF) and hence the photovoltaic efficiency (η). © 2015 The Author(s).

Kulkarni A.N.,PSGVPMs ASC College | Rajendra Prasad M.B.,University of Pune | Ingle R.V.,University of Pune | Pathan H.M.,University of Pune | And 3 more authors.
Optical Materials | Year: 2015

Films of Sb2S3 nanocrystals were deposited using chemical solution deposition. The structural and optical properties of the deposited films were investigated as a function of reaction time and temperature of the solution bath. The X-ray diffractometric studies confirmed the orthorhombic phase of Sb2S3 in the deposited films with steady variation in crystallinity. The effect of the bath conditions apparently was found to be playing a significant role in controlling the reaction rate resulting in the morphological evolution of the Sb2S3 nanocrystals. The band gaps of the deposited Sb2S3 films obtained from the optical absorption studies were found to be in the range 1.9-2.0 eV and suggest the possibility of band gap tunability of Sb2S3 in the visible region. The photoluminescence studies revealed that the Sb2S3 nanocrystals showed apparent band edge luminescence at around 610 nm and Stokes shifted defect induced emission at around 717 nm. © 2015 Elsevier B.V. All rights reserved.

Karode B.,PSGVPMs ASC College | Patil U.,R C Patel ASC College | Jobanputra A.,PSGVPMs ASC College
Indian Journal of Biotechnology | Year: 2013

Vanillin (4-hydroxy-3-methoxybenzaldehyde), a pleasant smelling aromatic compound, occurs naturally in vanilla beans. It is widely used as a flavouring additive for beverages and aromatic additive for candles, fragrances, and perfumes. It is also noted as nutraceutical. Efforts have been made to obtain aromatic compounds produced by means of biological process, which employ microorganisms. White rot fungus, Phanerochaete chrysosporium NCIM 1197 was used to transform lignocellulosic substrates like rice husk, groundnut shell, etc. Further, detection and quantification of vanillin were carried out by TLC and spectrophotometrically. The maximum vanillin production (up to 55 μg/mL) was observed within 72 h using groundnut shell as a substrate. The use of various carbon sources, viz., glucose and starch, along with groundnut shell, affected vanillin production. Supplementation of glucose along with groundnut shell showed more increase in vanillin production (37 μg/mL within 96 h) in comparison to the supplementation of starch (up to 21 μg/mL within 96 h).

Kulkarni A.N.,PSGVPMs ASC College | Kulkarni A.N.,College of Engineering, Pune | Arote S.A.,University of Pune | Pathanm H.,University of Pune | Patil R.S.,PSGVPMs ASC College
Bulletin of Materials Science | Year: 2015

The preparation of crystalline antimony sulphide (Sb2S3) by chemical route at room temperature was reported in this paper. The structural, morphological and optical properties of as-synthesized sample were systematically investigated. X-ray diffraction (XRD) analysis confirms the orthorhombic crystal phase for prepared Sb2S3. Scanning electron microscope (SEM) images show uniform, dense spherical morphology having diameter around 200-220 nm. Energy band gap calculated from optical absorption spectra was observed around 2.17 eV. Contact angle measurement confirms the hydrophilic nature of the deposited film. The photoluminescence analysis shows low green luminescence as well as Stoke's shift for as-prepared Sb2S3. The nanostructured solar cell is fabricated for energy harvesting purpose with Sb2S3-sensitized SnO2 photoanode and polysulphide electrolyte. The solar cell with FTO/SnO2/Sb2S3 photoanode shows VOC ∼ 240 mV, Jsc ∼ 0.640 mA cm-2 and FF ∼ 35%. The working mechanism and energy level diagram of Sb2S3/SnO2 system have been discussed. © Indian Academy of Sciences.

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