Study on light absorption of CH3NH3PbI3 perovskite solar cells enhanced by gold nanobipyramids

Perovskite solar cell is a third-generation solar cell with great potential. A method for reducing light energy loss and enhancing light absorption without changing the thickness of perovskite layer need to be developed ur- gently. In this paper, the gold nanobipyramids were applied in CH3NH3PbI3 perovskite solar cells, and their light absorption enhancement efficiency was calculated using the finite difference time domain method. The results show that the plasmon effect of gold nanobipyramids can significantly enhance the light absorption efficiency of the absorption layer with an increase of 45.48%. Further studies show that gold nanobipyramid arrays with different depths and layers remarkably influence the improvement of light absorption efficiency of the perovskite solar cells. The mechanism was verified by calculating the electric field enhancement and light reflectivity. Finally, an optimization scheme of gold nanobipyramid arrangement in perovskite layer was discussed. This study provides a new idea for enhancing the light absorption capacity and improving the photoelectric con- version efficiency of perovskite solar cells. This method has potential applications in other solar cells.

Automated summary

In this paper, gold nanobipyramids were used to enhance the light absorption efficiency in CH3NH3PbI3 perovskite solar cells. The plasmon effect of gold nanobipyramids increased the light absorption efficiency by 45.48%. The depth and layers of gold nanobipyramid arrays significantly influenced the improvement of light absorption efficiency. This study provides a new approach to enhance the light absorption capacity and improve the photoelectric conversion efficiency of perovskite solar cells, with potential applications in other solar cells.