Improved Efficiency of Inverted Perovskite Solar Cells Via Surface Plasmon Resonance Effect of Au@PSS Core‐Shell Tetrahedra Nanoparticles

Abstract

Sufficient absorption to incident solar illumination, long exciton diffusion length, and efficient dissociation are extremely critical factors to guarantee an acquirement of high power conversion efficiency (PCE) in solar cells, including perovskite solar cells (PSCs). In this work, Au@poly(4‐styrenesulfonate) (PSS) core–shell tetrahedra nanostructures, synthesized by seed mediated growth method, are incorporated into PSCs for the first time to improve light absorption of methylammonium lead iodide via surface plasmon resonance effect. Both the use of Au tetrahedra core and the introduction of ultrathin PSS shell are beneficial for generating a strong local field and preventing from exciton quenching at the surface of nanoparticles (NPs). With an optimal concentration of Au@PSS tetrahedra NPs, the PCE achieves 16.53%, showing a significant improvement factor of 18.83% compared to the reference device without NPs. Analyses indicate that in addition to promotion of light absorption of active layer over the broad wavelength range, the Au@PSS tetrahedra NPs also increase exciton dissociation and charge transfer efficiency by enhancing the recombination resistance inside PSCs and reducing photoluminescence intensity and exciton/carrier lifetime of perovskite films.

Oriented Perovskite Crystal towards Efficient Charge Transport in FASnI3 Perovskite Solar Cells

“…According to the fitted results shown in the inset of Figure 6e, the R rec value (75 343 Ω) is much larger for the 2,3‐DAPAC‐passivated FASnI 3 PSC than the control FASnI 3 one (27 312 Ω). Because the recombination ratio is inversely proportional to R rec , [ 65,66 ] the higher R rec value in the 2,3‐DAPAC‐passivated FASnI 3 PSC indicates that charge recombination is effectively inhibited with the use of 2,3‐DAPAC, which is consistent with the increased V oc .…”

Synergy of Plasmonic Silver Nanorod and Water for Enhanced Planar Perovskite Photovoltaic Devices

“…However, the utilization efficiency of photon energy below the wavelength of 350 nm and above 750 nm is poor, which limits the performance of PSCs . Therefore, finesses to enhance the light absorption of perovskite material over all the visible light range are adopted by researchers, among which the effect of surface plasmon polaritons (SPPs) have been widely adopted . SPPs are electromagnetic excitations existing at the interface between a metal (e.g., noble metal nanoparticles) and a dielectric material .…”

“…Through the multiple reflection and scattering of light, the path of light propagation will be extended . Other advantages of introducing SPPs effect include acting as a sub‐wavelength antenna, increasing the absorption cross‐section of semiconductors, promoting electron‐hole separation, forming Schottky junction to suppress the recombination …”

“…So far, the metallic nanoparticles have been applied in different layers of the PSC devices, e.g., the electron‐selective photoanode, the hole‐selective contact layer . However, only a few reports about the use of SPPs directly in the perovskite layer presented possibility due to the fear of reaction between the metal and the halide ions in the perovskite material .…”

Ag@SiO2 Core-shell Nanoparticles Embedded in a TiO2 Mesoporous Layer Substantially Improve the Performance of Perovskite Solar Cells

“…Furthermore, an insulating SiO 2 shell was added onto the surface of metal NPs to inhibit corrosion [ 29 ] and exciton quenching [ 30 ], however, this did not influence the LSPR effect. Metal-oxide core-shell NPs have widespread application in PSCs [ 31 , 32 , 33 , 34 , 35 , 36 ], as well as in DSSCs [ 37 ] and organic solar cells [ 38 , 39 ]. However, there has been little research on incorporating Ag@SiO 2 NPs into low-cost free-hole-conductor PSCs with carbon counter electrodes.…”