We systematically investigate the light absorption behavior of the Pb-based perovskite active layer in textured perovskite solar cells (PSCs) based on two-dimensional TiO2 nano-semisphere electron extraction layer by the finite element method (FEM). The simulation results reveal that enhanced light absorption efficiency of a 100-nm-thick textured perovskite layer achieves 64.8% under AM 1.5 G solar irradiation and owns increase of 16.8% in comparison to the control planar cell. To elucidate the origins of absorption enhancement, the detailed field distribution is investigated, displaying different photonic and plasmonic modes; their mutual coupling jointly resulting in a remarkable light absorption enhancement in the 600- to 800-nm-long wavelength range. Our textured PSCs offer an attractive solution to conserve Pb-based perovskite consumption and realize angle-insensitive and high-efficiency ultrathin PSCs.
It has been demonstrated experimentally that the presence of metallic nanoparticles (MNPs) in the active layer assists in improving the power conversion efficiency of organic solar cells (OSCs), due to the combination of favorable optical as well as electrical effects. In this work, the optical effects of two different spherical MNPs (Ag and Au nanospheres) on absorption enhancement in the active layer with the optimal thickness are analyzed in detail using finite-difference time-domain simulation. The results reveal clearly that the absorption enhancement in the OSCs is dependent on both the properties of MNPs and the types of the donor/acceptor blend systems. We conclude that Au nanospheres are less effective as compared to Ag nanospheres on absorption enhancement in OSCs, and large sized MNPs are favorable for light trapping in the organic active layer due to the prominent plasmonic excitations. For a low bandgap polymer PSBTBT:PC71BM blend system incorporating Ag nanospheres, a 11.2% increase in the integrated absorption is obtained due to the excitation of magnetic and electric resonances of surface plasmons. This work could contribute to the development of high efficiency plasmonic OSCs.
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