Abhay Kumar Singh; R. Ganesan; Jong Tae Park
Abstract
Next-generation high-performance heterojunction photovoltaic (PV) modules can be fabricated with an appropriate active layer material. Therefore, it is worth to examine physical properties of the recent developed Cu25(In16Ga9)Se40Te10 (CIGST) material for the potential photovoltaic application. This, ...
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Next-generation high-performance heterojunction photovoltaic (PV) modules can be fabricated with an appropriate active layer material. Therefore, it is worth to examine physical properties of the recent developed Cu25(In16Ga9)Se40Te10 (CIGST) material for the potential photovoltaic application. This, report demonstrates the structural, optical and electrical properties of the 8000 and 16000 pulses deposited CIGST films on top of the ITO coated soda lime substrate (CIGST/ITO/substrate); whereas, the substrate temperature was 550 0 C. The 16000 pulses deposited thin film surface roughness (45 nm) and thickness (~1.4 μm) are obtained lower and higher than the 8000 pulses thin film. The cross sectional EDS elemental mapping also gives the fewer interlayer inclusions for the 8000 pulses deposited thin film. With the increasing thin films thicknesses a distinguishable UV/Visible peak shift toward the high wavelength side and enhance in optical energy band gap (1.13 and 1.2 eV) are noticed. Device fabricated (CIGST/ITO/substrate) with the 16000 pulses have a sharp current growth upto 2.0 × 10 -2 amp with a lower resistance under the applied voltage range 0-20V. The internal (IQE) and external (EQE) quantum efficiencies charge carriers transport for the fabricated devices are also discussed.
J.S. Roy; T. Pal Majumder; R. Dabrowski; B.K. Mahato; A. Barman
Abstract
The optical properties of CdS nanorods have been modified in presence of antiferroelectric liquid crystals (AFLC). The effective refractive index of the CdS nanorods has been increased from 2.468 to 2.499 due to presence of AFLC molecules. The change in optical band gap of the CdS nanorods dispersed ...
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The optical properties of CdS nanorods have been modified in presence of antiferroelectric liquid crystals (AFLC). The effective refractive index of the CdS nanorods has been increased from 2.468 to 2.499 due to presence of AFLC molecules. The change in optical band gap of the CdS nanorods dispersed in AFLC causes the increment of refractive index of the CdS nanorods. The optical band gap of the CdS nanorods has been shifted from 2.61 eV to 2.52 eV due to presence of AFLC. We have also observed the enhanced photoluminescence (PL) intensity and red shift in emissive energy band of CdS nanorods dispersed in AFLC.
J. S. Roy; K. Pal; T. Pal Majumder
Abstract
Various nanostructured CdS samples have been synthesized with assistance of starch (bio-polymer) by solvothermal method. We have synthesized nano-regime, nanorods and nanoparticles by simply changing the starch-solvent combinations. The highly polymeric (branched) structure of starch capped the CdS samples ...
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Various nanostructured CdS samples have been synthesized with assistance of starch (bio-polymer) by solvothermal method. We have synthesized nano-regime, nanorods and nanoparticles by simply changing the starch-solvent combinations. The highly polymeric (branched) structure of starch capped the CdS samples to modify the surfaces and hence tune the optical properties. The optical band gaps for three samples are 2.34, 2.37 and 2.38 eV. The photoluminescence emission peak also changes with surface modification of the nanomaterials. The sensitivity of the optical properties of CdS nanomaterials with structural modification by means of polymer may be used for practical application like solid state lighting.
