ORCID Profile
0000-0003-4595-6367
Current Organisation
Bangladesh Atomic Energy Commission
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Publisher: Elsevier BV
Date: 2017
Publisher: AIP Publishing
Date: 07-2019
DOI: 10.1063/1.5109003
Abstract: Monocrystalline silicon solar cells with photo-absorbing morphology can lify light-trapping properties within the absorber layer and help to fabricate cost-effective solar cells. In this paper, the effect of different parameters namely temperature and time of Cu-assisted chemical etching was thoroughly investigated for the optimization of the light absorption properties. P-type monocrystalline wafers were selectively treated with Cu(NO3)2.3H2O:HF:H2O2:DI water solution at 50 °C for five different time duration. The entire process was repeated at five different temperatures for 20min as well to study the relation between etching temperature and surface reflectance. Sonication bathing was used for the removal of the deposited Cu atoms from the surface with the variation of time and the effect was examined using energy dispersive spectroscopy (EDS). Field emission scanning electron microscopy (FESEM) and UV/VIS spectroscopy were conducted to study the surface morphology and light absorbance respectively. Inverted shapes almost similar to inverted pyramids or porous surface were found randomly on the surface of the wafer. The effect of temperature was found more significant compared to the effect of time variation. An optimum light reflectance was found at 50 °C for 20 min of texturization. Atomic force microscopy (AFM) of the textured s le revealed the average depth of pyramidal shape was about 1.58 μm. EDS results showed a proportional relation between time and Cu removal process, and a complete Cu atoms free textured surface after 25 min of sonication bathing. Therefore, a suitable Cu-assisted texturization technique was found, which could enable lowering the photo-reflectance below 1% without any antireflection coating.
Publisher: IOP Publishing
Date: 22-02-2019
Publisher: Elsevier BV
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 06-02-2020
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 2017
Publisher: Walter de Gruyter GmbH
Date: 20-12-2017
Abstract: Use of Degussa P25 titanium-dioxide nanopowder in dye-sensitized solar cell (DSSC) photoanode improves efficiency of the DSSC cell. Annealing of titanium dioxide is required for fabrication of crystalline mesoporous thin film photoanode on transparent conducting glass using doctor blade method. Different annealing temperatures provide different structural, morphological, and optical properties of the photoanode, which may influence the efficiency of the cell. In this paper, energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and UV-Vis-NIR spectroscopicanalysis have been carried out to investigate annealing temperature effect on various structural parameters, mole-fraction, phase-content, and optical bandgap of the TiO 2 film photoanode. It was observed that depending on annealing temperature, theratio of polymorphs of Degussa P25 changed substantially. For the change in annealing temperature from 350 °C to 600 °C, variations occurred in crystallite size from 11.9 nm to 24.9 nm, strain from 0.006 to 0.014, specific surface area from 62.77 m 2 ·g -1 to 125.74 m 2 ·g -1 , morphology index from 0.49 to 0.64, dislocation density from 5 × 10 13 line/m 2 to 8 × 10 15 line/m 2 , crystallite per unit surface area from 2 × 10 13 m -2 to 2.5 × 10 14 m -2 , and optical bandgap from 2.4 eV to 3.1 eV.
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 09-2018
Publisher: Walter de Gruyter GmbH
Date: 20-10-2017
Abstract: Zinc oxide thin films with different thicknesses were prepared on microscopic glass slides by sol-gel spin coating method, then hydrothermal process was applied to produce zinc oxide nanorod arrays. The nanorod thin films were characterized by various spectroscopic methods of analysis. From the images of field emission scanning electron microscope (FESEM), it was observed that for the film thickness up to 200 nm the formed nanorods with wurtzite hexagonal structure were uniformly distributed over the entire surface substrate. From X-ray diffraction analysis it was revealed that the thin films had good polycrystalline nature with highly preferred c-axis orientation along (0 0 2) plane. The optical characterization done by UV-Vis spectrometer showed that all the films had high transparency of 83 % to 96 % in the visible region and sharp cut off at ultraviolet region of electromagnetic spectrum. The band gap of the films decreased as their thickness increased. Energy dispersive X-ray spectroscopy (EDS) showed the presence of zinc and oxygen elements in the films and Fourier transform infrared spectroscopy (FT-IR) revealed the chemical composition of ZnO in the film.
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 12-2018
Publisher: IOP Publishing
Date: 10-05-2019
Publisher: Elsevier BV
Date: 11-2018
No related grants have been discovered for M. Khalid Hossain.