Data from: Enhancing halide ion homogeneity in blade-coated wide-bandgap perovskite for perovskite-organic tandem solar cells

The shared processing technologies of perovskite and organic
semiconductors make them ideal partners for constructing
perovskite-organic tandem solar cells. However,
the different crystallization rates of bromide and
iodide ions lead to inhomogeneous vertical halide
distribution within wide-bandgap (WBG) perovskite
films, causing significant open-circuit voltage (VOC) loss. In
this study, we developed an approach to blade-coat
halide-compositionally homogeneous WBG perovskite films by introducing a
hydrogen-bonding donor solvent (formamide). The formamide effectively
modulates crystallization kinetics via balancing the differential
hydrogen-bonding interactions of formamide with bromide and iodide ions.
The resultant WBG perovskite solar cells achieved a power conversion
efficiency of 18.9 % with an exceptional VOC of 1.41 V. Finally, a
perovskite-organic tandem solar cell was fabricated,
achieving a high efficiency of 26.3 % (certified as 25.6 %)
and retaining 92 % of its initial
efficiency after being illuminated for 1,000 hours. This work
provides an approach for the large-area fabrication of
halide-compositionally homogeneous WBG perovskite films, paving the way
for the industrialization of tandem devices.