IOSR-JAP   Volume-13 ~ Issue-4 ~ Jul. – Aug. 2021

ABSTRACT: Dye sensitized solar cells were successfully fabricated using deionized water and ethanol to extract natural dye from Bush tea (Hyptis Suavelens). Nanocrystaline titanium (iv) oxide (TiO2) (solaonix SA) was deposited on the working electrode by Dr. Blade method and Platinum catalyst was deposited on the counter electrodes using screen printing method. The optical properties of the solar cells were investigated using Ava Spec-2048 UV/Visible Spectrophotometer. Electrical properties of solar cells were characterized using Oriel Class A Solar Simulator. The I-V characterization of the cells was measured in dark and illumination intensity and the illumination intensity used was....

Keywords: dye sensitized, solar cells, Nanocrystaline Titanium

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ABSTRACT: In nature every semiconductor material needs to be doped. Sometimes to nearly degenerate level, eg. In applications such as thermoelectric, transparent, electronics or power electronics. However, many materials with finite band gaps are not dopable at all, while many others exhibit strong preferences towards allowing either p-type or n-type doping, but not both. In this work we develop a model of strained InGaAs/GaAsSb double barrier quantum well heterostructure on InP substrate using the model solid theory. The matlab program model was used to obtain the conduction and valence band offsets and their ratios,. These were obtained theoretically by employing experimental binary band parameters obtained from literatures.

Keywords: Band Offsets; Intrinsic; Electron concentration; Strained Conduction Band.

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ABSTRACT: Al Doped CoO thin film [ACO] were successfully deposited on amorphous glass substrates using Successive Ionic Layer Adsorption and Reaction deposition method [SILAR]. The deposited film were annealed at temperature of 300oC and the annealed time varied for 1hr, 1hr.15mins, 1hr.30mins, 1hr.45mins and 2hrs. Thin films of ACO were deposited on glass by successive immersion of the substrate into a complex (NH4) AlCoCl2 bath kept at room temperature. 3ml of 3M solution of ammonia (NH4) used as a complexing agent was measures and added into a beaker with 40.0g of 0.6M of CoCl to form a complex cobalt ion, 10% of AlCl2 was also measured and added as a dopant....

Keywords: [Aluminum, Cobalt oxide, thin films, Annealing time,]

[1]. Ananda, K. and Rajendran, V. Morphological and size effect of NiO nanoparticle via solvothermal process and their optical properties. Material Science and Semi-Conductor Process, (2011), 14(1) 43-47.
[2]. Avila . G., Barrera . C., Huerta L. ., a d Mu l, S. "Structural and Electrical Characterization of Cobalt Oxide Semiconductors. Solar Energy Material and Solar Cells, (2004), 82; 269-275. "
[3]. Bahlawane, N., Premkumar, A. and Kohse, K. "Preparation of doped spinel cobalt oxide thin films and evaluation of their thermal stability. Chemical Vapor Deposition", (2007), 13(2-3), 118-122.
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[5]. Chougule, M., Palit, V. and Sen, S. "Synthesis and characterization of Co3O4. Thin films," (2012), 2(1).

ABSTRACT: A limited-extent test of the validity of using a statistical tool in conjunction with acquired ground electrical resistivity data to build a protocol that could ease the efforts and cost that is put into acquiring labourious vertical electrical sounding (VES) data-field in a geologically-similar locality has been completed at the 4 km2 southern Phase II Development of the Gidan Kwano Campus, Minna, Nigeria. The arbitrarily-fixed very high correlation threshold chosen for that study ensured that the statistical tool under consideration was given a negative recommendation even though the fundamental mathematics of this method was sound and the prevailing geology was encouraging. The aim of this study is to expand the scope of that previous study so as to further examine the results of the simple regression analysis (SRA) method as applied to the corpus of the 4 km2 VES data-field for a more....

Keywords: VES; resistivity; groundwater; statistical-analysis; SRA

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