The Effect of Indium Tin Oxide (ITO) Nanowire on Perovskite Thin Film Solar Cells
摘要
Thin film solar cells suffer from poor conversion efficiency due to a massive reduction in the optical path length as a result of the very thin layer of active material when compared to traditional amorphous silicon solar cells. Despite the adoption of several techniques including optical trapping using diffraction grating, localized surface plasmon polariton, anti-reflective coating, and optimization of the carrier collection process, thin film solar cells still exhibit poor conversion efficiency. In this work, to enhance the optical absorption, perovskite nanowires are considered as a component of the planar thin film solar cell structure, and optimization of the dimension and periodicity is performed on the basis of the optical performance of the structure. In the next step, indium tin oxide (ITO) nanowire is considered instead of perovskite, and a significant improvement in performance is observed. To further enhance the performance, the top of the ITO nanowire is modified such that the top surface becomes concave. Then the ITO nanowires are placed inside the active material layer for better carrier collection, and the depth of the nanowires is again optimized according to the performance results observed. The proposed thin film solar cell structure achieves conversion efficiency of 30.72% along with short-circuit current density of 33.87 mA/cm2 and open-circuit voltage of