Abstract
A novel class of ordered mesoporous titania scaffolds prepared via colloidal lithography is attractive for perovskite-based solar cells thanks to the increased light-trapping inside the perovskite layer induced by the feedback structure and to the improved perovskite film.
Highlights
Photonic structuring for photon recycling/ light trapping is a current area of interest in photovoltaics, with a view to optimizing the optical design for overall absorption, but there have been only a few studies aimed at templating mesoporous titania films onto well-ordered monolayers and/or reporting hollow structures
The most prominent feature that emerges from inspection of this data is the distinctively larger value of the power conversion efficiency (PCE) of the 370 nm sphere cells compared to all others i.e. B8.5 Æ 1%, albeit we do note that these are below the state-of-the-art values reported for compact TiO2 (c-TiO2) or meso-TiO2 cells.[28,29]
We note that the average short-circuit current densities ( Jsc) are higher for the nanostructured devices than for the devices prepared on both the compact titania layer and on the ‘‘standard’’ device prepared onto the nanostructured titania. We attribute this to two facts: first, as confirmed by the X-ray diffraction (XRD) pattern and AFM, the perovskite crystalline domains are smaller than the ones obtained onto the compact titania, and for this reason they are in full contact with the electron-transporting layer; second, the ordered layer is a better scattering medium compared the other two, and this improves light harvesting in the active layer
Summary
Photonic structuring for photon recycling/ light trapping is a current area of interest in photovoltaics, with a view to optimizing the optical design for overall absorption, but there have been only a few studies aimed at templating mesoporous titania films onto well-ordered monolayers and/or reporting hollow structures.
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