Band gap calculation of 2-D photonic crystal and its application towards thin film solar cell

Md. Ahsan Habib, Mohammad Zahir Uddin Suja, Sunayna Binte Bashar, Saeed Mahmud Ullah

Abstract


Two-dimensional (2-D) photonic crystals (PhCs) of square lattice have been investigated to find the complete photonic band gap. Band diagram calculations have been performed using the simulator "PWE band solver" of the software package optiFDTD, based on plane wave expansion method. Air holes in dielectric background with four different shapes have been considered. Parameters like filling fraction, rod/air hole orientation angle and material dielectric constant have been varied. It has been found that PhCs with square air holes have the largest gap; the gap-midgap ratio is 13.66% for GaAs (when filling fraction, f=0.680 and orientation angle ϑ = 30°). Finally, a proposal is made to improve the efficiency of thin film solar cell using this photonic crystal as back reflector.  

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Photonics Letters of Poland - A Publication of the Photonics Society of Poland
Published in cooperation with SPIE

ISSN: 2080-2242