Papers by Vikram Bhalekar
Quantum Dots - Recent Advances, New Perspectives and Contemporary Applications [Working Title]
In the modern and automated twenty-first century, with technological advancements, the scientific... more In the modern and automated twenty-first century, with technological advancements, the scientific society has gifted a new alternative clean energy source (dye/quantum dot sensitized solar cells) to mankind as one of the applications of nanomaterials. Nowadays, the world is using a tremendous amount of fossil fuel for energy creation, the solar energy by using nanomaterials in the form of solar cells is a perfect alternative. In the present chapter, the emphasis has been given on the different techniques used by the researcher for synthesis of nanoparticles. The synthesis of quantum dots by simple cost-effective technique is covered with respect to PbS quantum dots. The working of quantum dot sensitized solar cells is also explained with its basic components. The narrow-band-gap semiconducting materials, which are suitable for solar cell application, are also listed in this context.
A simple and cost-effective chemical precipitation method for the synthesis of Nb 2 O 5 nanoparti... more A simple and cost-effective chemical precipitation method for the synthesis of Nb 2 O 5 nanoparticles is reported. The as-synthesized powder is amorphous and after annealing at 500 C the crystalline phase is observed, which is then used for the preparation of photoelectrode material sensitized with N3 dye toward dye sensitized solar-cell application. The effect of Nb 2 O 5 layer over TiO 2 by making a bilayer structure for dye-sensitized solar-cell application is studied. The device performance is studied using the current density-voltage (J-V) curve as well as by external quantum efficiency measurement (EQE). Furthermore, the behavior of electron in the device is studied by electrochemical impedance spectroscopy (EIS) measurement. It is observed that the amount of dye loading increases with optical reflection for the bilayer structure, which leads to the improvement in J SC along with EQE. The maximum power conversion efficiency obtained for the bilayer structure is 5.26%.
Materials Research Express
ES Materials & Manufacturing
to editing, proofing, and formal publication of the final version of record. This work is current... more to editing, proofing, and formal publication of the final version of record. This work is currently citable by using the Digital Object Identifier (DOI) given below. The Version of Record will be published online in Early View as soon as possible and may be different to this accepted article as a result of editing. Readers should obtain the version of record from the journal website shown below when it is published to ensure accuracy of information. The authors are responsible for the content of this accepted article.
Journal of Solid State Electrochemistry
This study deals with the sensitization of the porous titanium oxide (TiO2) films deposited on fl... more This study deals with the sensitization of the porous titanium oxide (TiO2) films deposited on fluorine doped tin oxide with copper selenide (Cu3Se2). The sensitization was achieved for three different sensitization times employing chemical solution deposition with copper sulfate and sodium selenosulphate as precursors for copper and selenium ions, respectively. X-ray diffraction analysis confirms the tetragonal crystal phase of prepared Cu3Se2 film on glass substrate and deposition of Cu3Se2 on TiO2 film. Optical absorption spectra showed that deposition of Cu3Se2 film helps to enhance the photo-response of the TiO2 film. The Raman spectra analysis shows existence of vibration mode of Cu-Se covalent bond with lattice vibration modes of anatase phase of titanium oxide. Semiconductor-sensitized solar cell is fabricated for energy harvesting purpose with Cu3Se2-sensitized TiO2 photoanode, polysulphide electrolyte, and α-MoO3 carbon composite counter electrode. The working mechanism and energy level diagram of Cu3Se2/TiO2 system are discussed.
Chemical Physics Letters
Abstract Room temperature Successive Ionic Layer Adsorption and Reaction technique was efficientl... more Abstract Room temperature Successive Ionic Layer Adsorption and Reaction technique was efficiently used to sensitize PbS on ZrO 2 for device grade application. The chemical approach used in present study to lower down the development cost. UV–Vis study of PbS sensitized ZrO 2 showed good optical coverage over the visible region. Finally, the device fabrication was done for PbS sensitized ZrO 2 as photoanode, polysulphide as electrolyte and MoO 3 as a counter electrode. The effect of surface passivation (ZnS) over PbS is also examined. Surface passivated ZrO 2 /PbS device shows the improvement in efficiency of 1.53% which is ∼3 times higher than ZrO 2 /PbS (0.55%).
Now days, quantum dot sensitized solar cells have fascinated a great deal of interest due to its ... more Now days, quantum dot sensitized solar cells have fascinated a great deal of interest due to its advantages that include high molar extinction coefficient, tunable energy gaps, and multiple exciton generation of quantum dots. In this present work, the linker free approach was used to sensitize TiO photoelectrodes with PbS QDs by successive ionic layer adsorption and reaction at room temperature. The photovoltaic 2
ES Materials & Manufacturing
Engineered Science
The maximum efficient of 5.82 % was recorded for PbS sensitized TiO photoanode with 2 compact lay... more The maximum efficient of 5.82 % was recorded for PbS sensitized TiO photoanode with 2 compact layer and surface passivation by ZnS with polysulphide electrolyte and molybdenum oxide (MoO) as a counter electrode.
Materials Research Express , 2018
Sustained and efficient photovoltaic action depends on the electrolyte employed in the device lik... more Sustained and efficient photovoltaic action depends on the electrolyte employed in the device like Quantum Dot Sensitized Solar cell (QDSSC). The study here focuses on the comparison of performance of different polysulphide electrolytes in CdS QDSSC by virtue of difference in their composition. Systematic electrochemical analyses were performed to study the effect of electrolyte composition on the overall solar cell performance by employing chronoamperometry, electrochemi-cal impedance spectroscopy and electrical characterization of the fabricated solar cells. Of all the composition of electrolytes considered here, a modified polysulphide electrolyte with combination of ethanol, methanol and water has emerged as the best.
physica status solidi (a) , 2018
A simple and cost-effective chemical precipitation method for the synthesis of Nb 2 O 5 nanoparti... more A simple and cost-effective chemical precipitation method for the synthesis of Nb 2 O 5 nanoparticles is reported. The as-synthesized powder is amorphous and after annealing at 500 C the crystalline phase is observed, which is then used for the preparation of photoelectrode material sensitized with N3 dye toward dye sensitized solar-cell application. The effect of Nb 2 O 5 layer over TiO 2 by making a bilayer structure for dye-sensitized solar-cell application is studied. The device performance is studied using the current density-voltage (J-V) curve as well as by external quantum efficiency measurement (EQE). Furthermore, the behavior of electron in the device is studied by electrochemical impedance spectroscopy (EIS) measurement. It is observed that the amount of dye loading increases with optical reflection for the bilayer structure, which leads to the improvement in J SC along with EQE. The maximum power conversion efficiency obtained for the bilayer structure is 5.26%.
ES Materials & Manufacturing, 2019
View Article Online Lead sulfide quantum dots have been synthesized from a cost-effective and fac... more View Article Online Lead sulfide quantum dots have been synthesized from a cost-effective and facile chemical method namely ionic reaction using lead nitrate and sodium sulphide as precursors in aqueous solutions. The as prepared nanocrystals are characterized for their optical, structural and electrochemical properties using optical absorption spectroscopy, transmission electron microscopy and cyclic voltammetry respectively. The PbS quantum dots have an average size of 6 nm. The strong size quantization is observed from cyclic voltammetry and absorption spectroscopy.
This study deals with the sensitization of the porous titanium oxide (TiO 2) films deposited on f... more This study deals with the sensitization of the porous titanium oxide (TiO 2) films deposited on fluorine doped tin oxide with copper selenide (Cu 3 Se 2). The sensitization was achieved for three different sensitization times employing chemical solution deposition with copper sulfate and sodium selenosulphate as precursors for copper and selenium ions, respectively. X-ray diffraction analysis confirms the tetragonal crystal phase of prepared Cu 3 Se 2 film on glass substrate and deposition of Cu 3 Se 2 on TiO 2 film. Optical absorption spectra showed that deposition of Cu 3 Se 2 film helps to enhance the photo-response of the TiO 2 film. The Raman spectra analysis shows existence of vibration mode of Cu-Se covalent bond with lattice vibration modes of anatase phase of titanium oxide. Semiconductor-sensitized solar cell is fabricated for energy harvesting purpose with Cu 3 Se 2-sensitized TiO 2 photoanode, polysulphide electrolyte, and α-MoO 3 carbon composite counter electrode. The working mechanism and energy level diagram of Cu 3 Se 2 /TiO 2 system are discussed.
Room temperature Successive Ionic Layer Adsorption and Reaction technique was efficiently used to... more Room temperature Successive Ionic Layer Adsorption and Reaction technique was efficiently used to sen-sitize PbS on ZrO 2 for device grade application. The chemical approach used in present study to lower down the development cost. UV–Vis study of PbS sensitized ZrO 2 showed good optical coverage over the visible region. Finally, the device fabrication was done for PbS sensitized ZrO 2 as photoanode, poly-sulphide as electrolyte and MoO 3 as a counter electrode. The effect of surface passivation (ZnS) over PbS is also examined. Surface passivated ZrO 2 /PbS device shows the improvement in efficiency of 1.53% which is $3 times higher than ZrO 2 /PbS (0.55%).
tropmet.res.in
Global warming is an attack on the life line of world. Due to global warming temperature of the g... more Global warming is an attack on the life line of world. Due to global warming temperature of the globe is increasing, so there is increase in entropy, shifting of monsoon, , change in cropping pattern, several health related problems and recession in economy. Due to industrialization and deforestation, everything gets disturbed. It's a short term gain but long term loss.
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Papers by Vikram Bhalekar