Bilayer broadband antireflective coating to achieve planar heterojunction perovskite solar cells with 23.9% efficiency

Abstract

Although perovskite solar cells (PSCs) have achieved encouraging efficiency, the photon loss at the substrate due to light reflection has not been well addressed. Light management is promising to reduce reflection loss and realize higher power conversion efficiency (PCE) of PSCs. Here, a bilayer antireflective coating (ARC) has been designed and coated onto the backside of the glass substrate of (FAPbI 3) x-(MAPbBr 3) 1−x PSCs to enhance photon harvesting and consequently the device efficiency. The bottom layer of the bilayer ARC is made from a silica polymer and the top layer is made from the mixture of hexamethyldisiloxane-modified mesoporous silica nanoparticles and a fluorinated silica polymer. By adjusting the refractive index and the film thickness of each layer according to a two-layer model, enhanced glass transmittance in a broadband wavelength range can be reached, with the maximum transmittance increasing from ca. 90% to over 95%. With the bilayer ARC, the maximum short-circuit current density and PCE of (FAPbI 3) x (MAPbBr 3) 1−x PSCs can be increased from 25.5 mA cm −2 and 22.7% to 26.5 mA cm −2 and 23.9% with negligible changes in fill factor and opencircuit voltage. This work presents a simple yet effective strategy to enhance the efficiency of solar cells employing bilayer antirefective coatings, which can be applied to other types of solar cells.

Stable tin perovskite solar cells developed via additive engineering

“…Organic-inorganic lead halide perovskite solar cells (PSCs) have been instrumental in converting solar energy into electricity at low cost, and their efficiency has increased from 3.8% to 25.5% [1][2][3][4][5][6][7][8]. Improvements in their overall stability have also contributed to lead-based perovskite's success [9][10][11][12][13][14][15][16]; nonetheless, the toxicity of lead remains a concern in the large-scale application of PSCs, and the potential danger of lead poisoning has cast doubts over their future implementation [17,18].…”

Crystal growth of two-dimensional organic–inorganic hybrid perovskites and their application in photovoltaics

“…Once the ARC was used in the devices, the main increase of the photovoltaic parameters is the J SC , and the V OC and FF remain unchanged. 196,197 For example, Choi fabricated a sticker-type ultra-thin (20 μm) perfluoropolyether AR film (SUPA) with a refractive index of 1.34 and light transition efficiency of 98.3% (Fig. 15a), and the J SC of the SUPA-used PerSCs reached 26.63 mA cm −2 , which increased by 3.82% compared with the control device.…”

Reducing Optical Reflection Loss for Perovskite Solar Cells Via Printable Mesoporous SiO2 Antireflection Coatings

“…improved the transmittance of the glass substrate from 90% to 95% and got a PCE enhancement for PSCs by preparing a porous antireflective coating and a bilayer broadband antireflective coating with mesoporous silica nanoparticles. [ 50,51 ] Given these results, we can see that optical management has great significance on the photovoltaic performance enhancement for PSCs.…”