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Abstract
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Today, due to qualitative growth and scientific advances, energy, especially electricity is
increasingly needed by human society. One of the almost endless and pure energy which have
been paid attention over the years is the solar energy. Solar cells directly convert solar energy
into electrical energy and are one of the main blocks of photovoltaic systems. Significant
improvement has been made in the performance of solar cells since their introduction.
Improvement of parameters such as cell efficiency, solar spectrum absorption and manufacturing
costs which are key parameters in the process of cell development. The crystalline type is
commonly used to achieve a lower recombination and higher absorption coefficient, and other
types of silicon that have high recombination and low absorption coefficient, leading to a sharp
drop in cell efficiency are not used as much. Different kinds of light trapping techniques and
effective photons trapping using some fibered structures and various types of reflecting structures
and light scattering, etc., have been proposed. In this paper, distributed Bragg reflector structure
and also diffraction grating structure are used. In both structures, determination of the optimum
material and also geometric properties to achieve maximum improvement in efficiency have
taken into consideration.
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