Newly Developed Broadband Antireflective Nanostructures by Coating a Low-Index MgF₂ Film onto a SiO₂ Moth-Eye Nanopattern

Abstract

A newly developed nanopatterned broadband antireflective (AR) coating was fabricated on the front side of a glass/indium tin oxide/perovskite solar cell (PSC) by depositing a single interference layer onto a two-dimensional (2D)patterned moth-eye-like nanostructure. The optimized developed AR nanostructure was simulated in a finite-difference time domain analysis. To realize the simulated developed AR nanostructure, we controlled the SiO 2 moth-eye structure with various diameters and heights and a MgF 2 single layer with varying thicknesses by sequentially performing nanosphere lithography, reactive ion etching, and electronbeam evaporation. Optimization of the developed AR nanostructure, which has a 100 nm-thick MgF 2 film coated onto the SiO 2 moth-eye-like nanostructure (diameter 165 nm and height 400 nm), minimizes the reflection loss throughout the visible range. As a result, the short-circuit current density (J SC ) of the newly ARcoated PSC increases by 11.80%, while the open-circuit voltage (V OC ) remains nearly constant. Therefore, the power conversion efficiency of the newly developed AR-decorated PSC increases by 12.50%, from 18.21% for a control sample to 20.48% for the optimum AR-coated sample. These results indicate that the newly developed MgF 2 /SiO 2 AR nanostructure can provide an advanced platform technology that reduces the Fresnel loss and therefore increases the possibility of the commercialization of glass-based PSCs.

TiO 2 , ZnO, and SnO 2 -based metal oxides for photocatalytic applications: principles and development

“…Through the fabrication of polymeric pillars on polycarbonate substrates, Sun et al [115] achieved an average reflection of 1.21% in the visible light range from 380 to 760 nm, at normal incidence and below 4% at 50°of incidence angle (Figure 20c). A similar approach has been reported by Yoo et al [116] based on patterned SiO 2 nanopillar arrays coated with 100 nm of low-reflective index material MgF 2 (n = 1.38). Associated with a perovskite solar cell (PSC), SiO 2 /MgF 2 patterned surface demonstrate increase of the power conversion efficiency (PCE) by 12.50% [116].…”

“…A similar approach has been reported by Yoo et al [116] based on patterned SiO 2 nanopillar arrays coated with 100 nm of low-reflective index material MgF 2 (n = 1.38). Associated with a perovskite solar cell (PSC), SiO 2 /MgF 2 patterned surface demonstrate increase of the power conversion efficiency (PCE) by 12.50% [116].…”

“…Recently, the nature inspired approach of the Moth-eye gains significant attention due to a relatively simple fabrication approache and high AR efficiency [115,116]. This biomimetic approach tends to reproduce the surface of the moth eye which present the array of 200 to 300 nm sized pillars (Figure 20).…”

Performance Enhancement of All-Inorganic Carbon-Based CsPbIBr2 Perovskite Solar Cells Using a Moth-Eye Anti-Reflector

“…For the large-area devices (1 cm 2 ), it can be seen from Figure 6d and Table 1 that the improvement of PCE for CsPbIBr 2 PSCs with moth-eye anti-reflector resulted from the enhanced J SC by 15.09%, which is in line with above discussions. In addition, we also performed the optical simulations based on finite-difference time-domain (FDTD) [39,[57][58][59] to explore the more efficient moth-eye nanostructures. It is found that by adjusting the ratios of depth to width, line widths, and periods, this structure is promising to achieve better anti-reflectivity at wider wavelength range (seeing supporting information), and thus may be used in future single and multi-junction solar cells.…”

Photonic crystals for perovskite‐based optoelectronic applications

“…A suitable optical design can simultaneously enhance the light trapping (LT), prolong the optical path length, improve the perovskite film quality and release the residual stress. [28][29][30][31][32][33][34] Photonic crystal (PC) is one of the most common bio-inspired ordered periodic structures for manipulating light. [35][36][37][38] According to the structure of PC, it can be divided into one-dimensional (1D) PC, two-dimensional (2D) PC, and three-dimensional (3D) PC, as shown in Figure 1.…”