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PEC solar cell behaviour of NbSe2 and NbS2 single crystals grown by DVT technique

Author Affiliations

  • 1Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, Gujarat, India
  • 2Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, Gujarat, India
  • 3Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, Gujarat, India
  • 4Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, Gujarat, India
  • 5Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, Gujarat, India
  • 6Department of Physics, Sardar Patel University, Vallabh Vidyanagar-388120, Gujarat, India

Res. J. Physical Sci., Volume 5, Issue (7), Pages 1-7, September,4 (2017)

Abstract

Transition Metal dichalcogenides constitute a well- defined family of compounds which crystallize in a layer type structure. These compounds have energy band gap close to the solar spectrum maxima and hence they form an important class of solar cell materials. P-N junction and other solid junction solar cells are practical form of solar cells which have been, by now, transformed from research level to commercial shape; where as solid – liquid junction solar cells have some limitations for their commercialisation. Nevertheless, they form an important tool to study electrochemical interaction for characterizing different material properties of semiconductor electrode. In this paper authors have attempted to fabricate Photoelectrochemical solar cell with semiconductor electrode using crystals of NbX2 (X= S, Se) grown by Vapour transport techniquei. E. Direct Vaapour Transport (DVT) technique. Two solar cell electrodes using single crystals of NbSe2 and NbS2 as photoelectrodes have been prepared. A mixture of iodine [I2], potassium ferricyanide [K3Fe(CN)6] and potassium ferrocyanide [K4Fe(CN)6] was employed as an electrolyte with concentration of 0.025M I2 + 0.1M [K4Fe(CN)6] + 0.1M [K3Fe(CN)6]. The dark and polychromatic solar cell responses were recorded with the help of incandescent lamp varying intensity of illumination between 30 mW/cm2 to 120 mW/cm2. The solar cell parameters like fill factor (FF), Open circuit Voltage (Voc), Short circuit Current (Isc) and photoconversion efficiency (&

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