Light Management via Tuning the Fluorine‐Doped Tin Oxide Glass Haze‐Drives High‐Efficiency CsPbI₃ Solar Cells

Abstract

Transparent conductive fluorine‐doped tin oxide (FTO) glasses play a vital role in perovskite solar cells (PSCs) for their high conductivity and outstanding transparent properties. However, among all optical characteristics (transmittance, reflectance, and scattering) for glass, the light‐scattering property (usually defined by the haze) is usually negligent. Herein, four kinds of glasses with different hazes for CsPbI3 PSCs are carefully studied. Obviously, by using optimal glass (haze of 5%, transmittance of 83%, and no antireflection layer), the short‐circuit current density (JSC) and power conversion efficiency (PCE) of the cell are enhanced for reducing the escape of light from the solar cell. Further characterization reveals that such improvement not only originates from the comprehensive effect of the scattering from the FTO glass but also the large contrast in the imaginary part of the refractive index and the surface roughness between each layer in the PSC. Meanwhile, the effect of the presence of antireflection films on light scattering is compared. It is also found that leakage current induced by haze glass is avoided for small‐area (0.09 cm2) PSCs usually fabricated in the laboratory.

HI hydrolysis-derived intermediate as booster for CsPbI3 perovskite: from crystal structure, film fabrication to device performance

“…Meanwhile, its performance was greatly increased 3.15%, from 15.53% to 16.02% [89] . Furthermore, we developed a core-shell-structured upconversion nanoparticles (UCNPs) to capture the NIR light, making it possible to obtain 15.86% PCE (noted that the improvement of PCE is negligible), J SC = 19.17 mA/cm 2 [90] . We also investigated the influence of different haze glass substrates, and used the optimized one to fabricate CsPbI 3 PSCs with 16.24% PCE.…”

“…This maybe cause by current loss and insufficient utilization of light, resulting from the relatively large bandgap (compared with hybrid perovskite films). Developing high efficiency DCNPs/UCNPs, to capture UV-light or NIR could be an useful solution [90] .…”