An Experimental Analysis of Illumination Intensity and Tilt Angle Dependency of Photovoltaic Cell Electric Output Parameters

K.M. Omatola¹ , V.I. Sule²

1. Department of Physics, Kogi State University, Anyigba, Nigeria.
2. Department of Physics, Kogi State University, Anyigba, Nigeria.

Correspondence should be addressed to: komatola@yahoo.com, Tel.:+2348053507607.

Section:Research Paper, Product Type: Journal-Paper
Vol.8 , Issue.2 , pp.15-21, Apr-2020

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v8i2.1521

Online published on Apr 30, 2020

Copyright © K.M. Omatola, V.I. Sule . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Photovoltaic effect or phenomenon is the creation of a voltage and corresponding current in a material upon exposure to light energy following the principle that for every excitation there must be a response. The exposition of a solar cell to incident optical radiation excites the dislodgement of electrons hence the creation of holes and subsequent migration of opposite charges. The amount of voltage that can be generated is a function of the intensity of incident optical radiation and the position of the solar cell to such radiation. Measurements of illumination intensity from halogen and tungsten lamps by a digital lux meter and open circuit voltage, short circuit current as output parameters by volt- amp meter LCD display embedded in the solar power device was carried out. The evaluation of fill factor, maximum power and conversion efficiency as other output parameters in relation to illumination from the sources of light at varying angle and distance were carried out in this study also. The variation of the internal resistance of the cell with light intensity was also investigated. The maximum output voltage and current were realized at angle zero degree when the light ray falls at normal to the cell surface. The two 10Watts halogen lamp gave the highest illumination intensity of 116lx while the 40Watt and 60Watt tungsten lamp placed at 10cm from the solar cell indicated an intensity of 70lx and 25lx each. The results showed the strongly direct dependency of these parameters on illumination intensity and their inverse dependence on the tilt angle and distance of the illumination source. The internal resistance decreases with increasing intensity while the evaluated fill factor, maximum power and efficiency remain fairly constant but at an average value 0.53, 122mW and 55% respectively.

Key-Words / Index Term :
Output parameters, Photo generated Voltage, Open Circuit Current, Fill factor, Conversion Efficiency

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