High-Performance Perovskite Solar Cells with a Weak Covalent TiO₂:Eu³⁺ Mesoporous Structure

Abstract

Mesoporous TiO2 nanocrystals with attached Eu3+ ions in an amorphous state are employed as structures for highly efficient perovskite solar cells. The down-conversion TiO2:Eu3+ nanocrystal shows a good photoluminescence characteristic to convert the incident high-energy photon into a lower-energy photon, which improves the UV light utilization capability of perovskite solar cells (PSCs). The device within 1.0 wt % Eu3+ ions shows an improvement of 29.2% from 12.22% to 15.79% in PCE compared with the typical devices without Eu3+ in TiO2, which is attributed to the increased utilization of incident UV light and the dramatically suppressed electron recombination process. To summarize, the combination of a high UV light-harvesting capability and a slow electron recombination process with TiO2:Eu3+ mesoporous structure could successfully develop more efficient and stable PSCs.

Co/Eu co‐doped electron transport layer enhances charge extraction and light absorption for efficient carbon‐based HTM‐free perovskite solar cells

“…This is well agreement with the previous reports by Jiang. 28 Based on the above analysis, we conclude that low Co/Eu co-doping content (3%Co/0.6%Eu) has no conspicuous influence on the crystallinity of TiO 2 and the lowered peak intensities ( Figure 1A) of XRD patterns are ascribed to the Eu doping.…”

Mechanisms and Suppression of Photoinduced Degradation in Perovskite Solar Cells

“…An ideal downshifting layer is expected to have strong UV absorption capability, excellent luminescence quantum yield, low-cost manufacturing, long-term stability and so on. [209][210][211] The down-conversion material can be placed outside the device or inside the device. [212,213] As the poor transmittance of the down-conversion layer limits its application outside the device, [214] it was usually integrated into the interior of the device, by which the converted light can be absorbed by the photoactive layer.…”

Excitation of Wet Perovskite Films by Ultrasonic Vibration Improves the Device Performance

“…The low shunt resistance and the low FF are due to manufacturing defects of all the layers. Optimization of other layers, such as the HTL, and employing compositional and interface engineering [48] would further increase the photovoltaic parameters, albeit at the expense of additional steps and costs. Finally, Figure 13b shows the histogram of 50 MAPbI 3 devices treated with the SVPT for 180 s, as well as the histogram of the control devices.…”