Study on light absorption enhancement of perovskite solar cells by gold nanobipyramids

Abstract

As the third generation of solar cells, perovskite solar cells have attracted extensive attention because of their relatively simple structure and high theoretical photoelectric conversion efficiency. However, there are still some problems in thin film perovskite solar cells, such as severe light energy loss, less light absorption in the near-infrared region and part of visible wavelength. Without increasing the thickness of the perovskite absorption layer, using the plasmon effect of metal nanoparticles is an effective method to reduce the light energy loss and enhance the light absorption of solar cells. In this paper, the light absorption of two kinds of perovskite solar cells with and without gold nanobipyramids array structure are simulated by the finite difference time domain method. The results show that the light absorption efficiency of the absorption layer of perovskite solar cells with gold nanobipyramids array structure is improved by 42.93%. Further research shows that the local surface plasmon resonance of gold nanobipyramids can produce substantial electric field enhancement, which may be why gold nanobipyramids enhance the light absorption and improve the efficiency of perovskite solar cells. This study provides a new idea to improve the photoelectric conversion efficiency of perovskite solar cells.