Light-trapping in perovskite solar cells

We numerically demonstrate enhanced light harvesting efficiency in both CH3NH3PbI3 and CH(NH2)(2)PbI3-based perovskite solar cells using inverted verticalcone photonic-crystal nanostructures. For CH3NH3PbI3 perovskite solar cells, the maximum achievable photocurrent density (MAPD) reaches 25.1 mA/cm(2), corresponding to 92% of the total available photocurrent in the absorption range of 300 nm to 800 nm. Our cell shows 6% absorption enhancement compared to the Lambertian limit (23.7 mA/cm(2)) and has a projected power conversion efficiency of 12.9%. Excellent solar absorption is numerically demonstrated over a broad angular range from 0 to 60 degree for both S- and P-polarizations. For the corresponding CH(NH2)(2)PbI3 based perovskite solar cell, with absorption range of 300 nm to 850 nm, we find a MAPD of 29.1 mA/cm(2), corresponding to 95.4% of the total available photocurrent. The projected power conversion efficiency of the CH(NH2)(2)PbI3 based photonic crystal solar cell is 23.4%, well above the current world record efficiency of 20.1%. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).