Improved Optical Efficiencies of Perovskite Thin Film Solar Cells by Randomly Distributed Ag Nanoparticles

The position of embedded plasmon nanoparticle is a key factor affecting the performance of perovskite solar cells (PSCs). It is crucial to unveil whether and how do the randomly distributed Ag nanoparticles within the active layer improve the optical efficiency of PSC. In this work, a comparative study between the optical properties of PSCs by embedding randomly distributed Ag nanospheres and nanocubes within the absorption layer is numerically performed by the finite element method. It demonstrates that the obtained maximum photocurrent reaches 23.5 mA/cm 2 and 23.6 mA/cm 2 , which gets 22.7% and 23.3% improvement relative to that of planar reference, respectively. Their optimal filling factor F is also predicted, which is discussed in terms of the synergistic effects of the localized surface plasmon resonance (LSPR) and the occupancy competition between the nanoparticle and perovskite. The photocurrent improvement of the concerned PSCs embedded with Ag@TiO 2 core–shell NPs is also discussed. The present work is believed to be highly useful for the future development and application of PSCs to boost their optical efficiencies, especially for PSC embedded with randomly distributed plasmon nanoparticles.