Ion-Dipole Interaction Enabling Highly Efficient CsPbI 3 Perovskite Indoor Photovoltaics.

Metal halide perovskites are ideal candidates for indoor photovoltaics (IPVs) because of their easy-to-adjust bandgaps, which can be designed to cover the spectrum of any artificial light source. However, the serious non-radiative carrier recombination under low light illumination restrains the application of perovskite-based IPVs (PIPVs). Herein, polar molecules of amino naphthalene sulfonates were employed to functionalize the TiO 2 substrate, anchoring the CsPbI 3 perovskite crystal grains with a strong ion-dipole interaction between the molecule-level polar interlayer and the ionic perovskite film. The resulting high-quality CsPbI 3 films with the merit of defect-immunity and large shunt resistance under low light conditions enabled the corresponding PIPVs with an indoor power conversion efficiency of up to 41.2% (P in : 334.11 𝜇W/cm 2 , P out : 137.66 𝜇W/cm 2 ) under illumination from a commonly used indoor light-emitting diode light source (2956 K, 1062 lux). Furthermore, the device also achieved efficiencies of 29.45% (P out : 9.80 𝜇W/cm 2 ) and 32.54% (P out : 54.34 𝜇W/cm 2 ) at 106 (P in : 33.84 𝜇W/cm 2 ) and 522 lux (P in : 168.21 𝜇W/cm 2 ), respectively. This article is protected by copyright. All rights reserved.