Fig. 11. (a). Schematic diagram depicting the SIM on the (110) crystal plane of rutile-TiO₂ (for octahedra, grey: PbI₂Br₄, green: SmBr₆, blue: TiO₆; for spheres, and pink: Cs). Reproduced with permission.¹²⁹ Copyright 2018, Wiley-VCH. b. UPS spectra of SnO₂ and SnO₂/PEIE. (c). Energy-level diagram of IPSCs. (b and c) Reproduced with permission.¹³² Copyright 2021, Wiley-VCH. (d). Schematic diagram of charge transfer from GO to inorganic NPs. (e). Characteristic J–V curves of various solar cells. (f). Long-term stability of IPSCs. (d–f) Reproduced with permission.¹³⁴ Copyright 2021, Wiley-VCH.