Highly efficient perovskite solar cells with a compositionally engineered perovskite/hole transporting material interface

Abstract

We demonstrate reduced charge recombination by formation of an engineered passivating layer, which leads to an enhanced power conversion efficiency of 21%.

Mixed 3D–2D Passivation Treatment for Mixed‐Cation Lead Mixed‐Halide Perovskite Solar Cells for Higher Efficiency and Better Stability

“…Results are shown in Figure 2. [9,17,27] Upon deposition of the mixture of FAI and iBAI solution on the perovskite surface, prominent changes can be observed: 1) the bright white grains on the surface disappeared; 2) surface morphology is changed as the iBAI content increases. [9,17,27] Upon deposition of the mixture of FAI and iBAI solution on the perovskite surface, prominent changes can be observed: 1) the bright white grains on the surface disappeared; 2) surface morphology is changed as the iBAI content increases.…”

“…[9,17,27] Upon deposition of the mixture of FAI and iBAI solution on the perovskite surface, prominent changes can be observed: 1) the bright white grains on the surface disappeared; 2) surface morphology is changed as the iBAI content increases. [8,9,17] The formation of a surface layer on the MP50-treated sample is confirmed by cross-section SEM imaging (Figure 2h), showing a continuous film with finer grains formed on top of the 3D perovskite which has much larger grains. Pinholes occasionally appear in this surface layer (Figure 2b and Figure S3 (Supporting Information)).…”

“…This Figure 3b. [9] For the MP0-treated sample in Figure 3b, a plane XRD pattern was obtained ("PbI 2 + MP0" line in Figure 3b) without any of the peaks for pure iBAI, FAI, or PbI 2 (for reference, XRD peaks for pure iBAI and FAI on test structures are displayed Figure S4 in the Supporting Information). It can be seen that films with MP treatment in Figure 3b do not have the PbI 2 peak at 12.6°, consistent with results shown in Figure 3a, suggesting that the PbI 2 has been involved in a reaction with the MP precursor solutions.…”

Spiro‐Phenylpyrazole‐9,9′‐Thioxanthene Analogues as Hole‐Transporting Materials for Efficient Planar Perovskite Solar Cells

“…Since the first report by Miyasaka and co-workers in 2009, [1] the perovskites (e.g., CH 3 NH 3 PbI 3 ) have been widely studied due to their good light absorption capability from visible to near-infrared, long charge diffusion lengths, and high carrier mobilities as well as solutionprocessabilities. [11][12][13][14][15][16][17][18][19] Nowadays, as a necessary component in the most studied conventional n-i-p junction PVSCs, the hole-transporting materials (HTMs) play an even more critical role in efficiently extracting holes separated from perovskite layer and simultaneously transmitting to anode in order to avoid loss in open-circuit voltage (V oc ) and decrease in charge recombination. [11][12][13][14][15][16][17][18][19] Nowadays, as a necessary component in the most studied conventional n-i-p junction PVSCs, the hole-transporting materials (HTMs) play an even more critical role in efficiently extracting holes separated from perovskite layer and simultaneously transmitting to anode in order to avoid loss in open-circuit voltage (V oc ) and decrease in charge recombination.…”

Analysing the Prospects of Perovskite Solar Cells within the Purview of Recent Scientific Advancements

“…With the XRD pattern, they proved that the partially reacted PbI 2 was converted into perovskite, suppressing the defects and enhancing the Voc. This modification resulted in an efficiency of 21.3% for the best cell [51].…”