Photonic Structuration of Hybrid Inverse-Opal TiO₂—Perovskite Layers for Enhanced Light Absorption in Solar Cells

Abstract

Photonic structuration is an efficient way to improve light harvesting in multiple optoelectronic applications. In this study, photonically structured TiO2 is considered as a photoanode layer for perovskite solar cells to enhance light absorption through the excitation of quasi-guided modes within the photoactive perovskite material, while optimizing the charge collection in the photovoltaic assembly and therefore its global efficiency. Practically, polystyrene beads of various diameters are used as hard templating sacrificial agents for the design of inverse-opal TiO2 through spin-coating protocols. The positive impact of the porous photonic structuration in comparison with compact, unstructured photoactive layers is demonstrated. An optimum of light absorption is shown for hybrid TiO2–perovskite structures composed of ∼400 nm diameter TiO2 hollow spheres filled with CH3NH3PbI3, confirming recent numerical predictions. However, electronic-related countereffects are observed in consecutively assembled solar cells when pore dimensions exceed the estimated diffusion length of electrons in the infiltrated perovskite material. Upper conversion efficiency is obtained with solar cells composed of ∼220 nm diameter large TiO2 pores filled with CH3NH3PbI3.

Spray‐Coated Lead‐Free Cs2AgBiBr6 Double Perovskite Solar Cells with High Open‐Circuit Voltage

“…EIS results are presented as Nyquist plots in Figure 6. Data were fitted with the equivalent circuit model shown in the inset [41] and are shown in Table 2. The equivalent electrical circuit consists of: an R 1 resistance associated with wires and contacts (high frequency); an R 2 //Q 2 element (with Q as constant phase element modeling an imperfect capacitor) characteristic of the selective contacts, including c-TiO 2 and mp-TiO 2 for electron-selective contacts and the Spiro-OMeTAD for hole-selective contacts, respectively (medium frequency); and an R 3 //Q 3 element for interfacial recombination between electrons and holes (low frequency).…”

Zirconium-based cubic-perovskite materials for photocatalytic solar cell applications: a DFT study

“…[1][2][3][4][5] As a result, technology based on perovskites is estimated to be more cost-effective and appropriate than silicon-based technology. 6 The scientic community has especially interested in halide hybrid perovskites from 2009 to 2020. So the efficiency has improved from 3.8 percent to 23.7 percent in these era.…”

“…Consequently, solar cells manufactured from these supplies will be more efficient than silicon-created solar cells. 6 This class of semiconductors can also be observed in a variety of other electronic devices, such as LEDs, photo-detectors, and other solar-to-fuel conversion devices. 25,26 Perovskites exhibit semiconducting and insulating properties, according to previous research.…”

Quasi-Guided Modes in Titanium Dioxide Arrays Fabricated via Soft Nanoimprint Lithography

“…There have only been a few observations QGMs in titania-based structures. , This is the first report in which the electric and magnetic QGMs coupled to the mixed RA­(1,1) have been observed. Furthermore, the E-QGM1 mode observed for the A550 and A480 at high R6G concentrations had Q-factors of ∼110 (fwhm ∼8 nm) and ∼ 80 (fwhm ∼8 nm), respectively, and a reflectance peak of roughly ∼50%.…”