Introducing nanostructure patterns for performance enhancement in PbS colloidal quantum dot solar cells

With attention to the thin film structure of colloidal quantum dot solar cells, in this paper in order to improvement of active layer absorption of them, we have proposed the use of nanostructure pattern for enhancement of their performance. For this purpose we have presented suitable nano hemisphare patterns in colloidal quantum dot solar cells for light trapping in absorption layer. Then with simulation of the obtained nanostructure solar cells we have studied on improving the absorption spectrum and thus increasing the short circuit current density of them. In order to simulation of light propagation in nanostructures, we have used finite-difference time-domain method. According to the calculation results and with optimization of periodic nanostructure patterns, we have shown that short circuit current density has been increased up to 15.95%. Absorption spectrum, quantum efficiency density and short circuit current density have been discussed for colloidal quantum dot solar cells nanostructures with low and high thickness of absorption layer in this paper.