Plasmonic Au Nanooctahedrons Enhance Light Harvesting and Photocarrier Extraction in Perovskite Solar Cell

Abstract

Improvements in the light-harvesting capacity and the carrier extraction are both significant to improve the photovoltaic performance of perovskite solar cells (PSCs). It has been proved that local surface plasmon resonance (LSPR) based on metallic nanostructures is practical for capturing light to enhance light harvesting. Motivated by this, a special shaped Au nanoparticle, e.g., nanooctahedrons (Au NOs), with a broadband LSPR peak and a suitable size is controlled synthesized and applied in a PSCs device. The power conversion efficiency of PSCs is increased from 16.95 to 19.05% with a short-circuit current density (J sc) as high as 23.63 mA/cm2. Besides the enhanced light-trapping effect of Au NOs LSPR proved by optical spectroscopy analysis, the Kelvin probe force microscopy results show that Au NOs can also effectively reduce the surface potential of the electron transport layer, which promotes effective photocarrier extraction at the interfaces. This paper sheds light on the question of how plasmon excitation and light localization might be used advantageously in high-efficiency photovoltaics.

Ag/MgO Nanoparticles via Gas Aggregation Nanocluster Source for Perovskite Solar Cell Engineering

“…Moreover, in Figure 8 , the IPCE spectra of the best-performing cell and of the (0%) reference cell are compared, along with the corresponding integrated current density (J integrated ). The observed enhancement in IPCE takes place in the whole (340–760) nm optical window, in agreement with previous results reported in the literature [ 99 , 100 , 101 ]. This broadband effect has been attributed to different NP-related effects, suggesting that, besides near-field LSPR-enhanced absorption, other mechanisms such as increased far-field scattering, facilitated charge-transfer and separation [ 37 , 102 ] and reduction in the exciton binding energy [ 42 , 48 ] may play a relevant role.…”

Lithography-Free, Large-Area Spatially Segmented Disordered Structure for Light Harvesting in Photovoltaic Modules

“…Based on the design of the photonic structure to deliver sunlight into the active area, structural approaches such as the use of prisms, randomly scattered pyramid structures, , tapered structures, , diffraction gratings, , correlating nanostructure, and periodic/nonperiodic array , have been reported. Fundamentally, focused on either antireflection (AR) or light redirection, its designing and processing results are successfully presented. − However, to address the entailing issues from optical losses, a more robust/comprehensive strategy is necessary, which can simultaneously control the incident light to achieve AR, light collection, and complete light trapping. , Furthermore, to maximize the light harvesting performance with satisfactory cost-effectiveness of modularization of the PV system and scalability, simple-processed and affordable photonic structures are required. However, the complicated process and the sophisticated pattering still highly diminish the cost-effectiveness and further limit the mass production on a large scale. − …”

Controlling the charge carrier dynamics by modulating the orientation diversity of perovskites

“…To investigate the effect of the perovskite active layers, we used well-known transporting materials without special treatment. [27][28][29][30][31] As shown in Fig. 4b, at a scan rate of 0.1 V s À1 with an aperture area of 0.09 cm 2 , the D.O.…”