| Popis: |
The performance of thin film solar cells in terms of photonic conversion efficiency (PCE) is presently not satisfactory. Several techniques are being applied to enhance their efficiency by considering optical trapping and/or by improvement in electrical properties. Among many optical trapping processes, use of surface plasmon effect is a promising technique for significant improvement in optical absorption as well as photonic conversion efficiency mainly in semi-transparent active material based solar cells. This effect obtained by interaction of the metal nano structure with incident electromagnetic radiation can result in massive increment in effective absorption of photons inside active material of solar cells. On the other hand, the properties of surface plasmon can be tuned by changing the shape, size and environmental dielectric of metallic nano-structures. In this work, silver nano balls of particular size and position are suitably placed in perovskite thin film solar cells to produce surface plasmon effect and the corresponding improvement in performance is observed with the help of theoretical simulations. To make the solar cell cost effective as well as efficient, silver nano balls are replaced with nano balls of polystyrene coated with silver. By proper optimization of size and position of silver coated polystyrene nano balls, we propose a 500nm thick methylammonium lead tri-iodide (CH3NH3PbI3) based solar cell of maximum photonic conversion efficiency (η) 22.56% having short circuit current density (JSC) 25.68mA/cm2 and open circuit voltage (VOC ) 1.003V with a fill factor (FF) 87.59% while considering 1.5AM solar irradiance. |
