Enhanced interfacial characteristics of perovskite solar cell with multi-functional organic hole-selective interlayer

Enhancement of Interfacial Properties by Indoloquinoxaline‐Based Small Molecules for Highly Efficient Wide‐Bandgap Perovskite Solar Cells

“…Consequently, these results indicate the effective passivation of undercoordinated Pb 2+ ions by the organic HTMs. [46,58] To understand the charge distribution within the molecules and the interactions between each organic HTM and perovskite layer, we conducted Kevin probe force microscope (KPFM) analyses (Figure 3b). It has been reported that, when a molecule possesses a sufficiently high intrinsic dipole moment and is subjected to an electric field, a strong induced dipole moment ( = polarizability × electric field) is generated.…”

“…Apart from molecular geometries, the existence of multiple Lewis basic nitrogen sites in both IQTPA and IQTPAFlu is beneficial for passivating the defects in perovskite layer through the strong interaction with uncoordinated Pb 2+ cations. [ 45,46,57 ] The passivation of defects in the perovskite layer by the organic interlayer was confirmed through X‐ray photoelectron spectroscopy (XPS) measurements. The interface region between NiO x and the perovskite was identified by the rapid variation in the intensity of the Pb 4f signals during Ar ion sputtering (Figure S12, Supporting Information).…”

“…Consequently, these results indicate the effective passivation of undercoordinated Pb 2+ ions by the organic HTMs. [ 46,58 ]…”

Dopant‐free NiOx Nanocrystals: A Low‐cost and Stable Hole Transport Material for Commercializing Perovskite Optoelectronics

“…Park et al. reported a newly design 5,11‐dihydroindolo[3,2‐b]carbazole‐based polymeric macromolecule (PSIC x ) that can enhance the interfacial characteristics between the solution‐processed NiO x NCs and perovskite, consequently improving the performance and stability of inverted PSCs [72] …”

“…Park et al reported a newly design 5,11-dihydroindolo [3,2-b]carbazole-based polymeric macromolecule (PSIC x ) that can enhance the interfacial characteristics between the solution-processed NiO x NCs and perovskite, consequently improving the performance and stability of inverted PSCs. [72] Recently, ionic liquids and inorganic salts have also been employed to modify the properties of the NiO x /perovskite interface. For example, Bi et al reported a kind of ionic liquid, 1-ethyl-3-methylimidazolium aminoacetate (EMI-MAE), which was adopted as an interfacial modifier at the NiO x /perovskite interface.…”