Ion-Dipole Interaction Enabling Highly Efficient CsPbI<sub>3</sub> Perovskite Indoor Photovoltaics.
basic_science · Level V
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- Record sourced from PubMed, PMID 37286198.
- Also identified by DOI 10.1002/adma.202210106.
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Abstract
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 are employed to functionalize the TiO<sub>2</sub> substrate, anchoring the CsPbI<sub>3</sub> 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<sub>3</sub> films with the merit of defect-immunity and large shunt resistance under low light conditions enable the corresponding PIPVs with an indoor power conversion efficiency of up to 41.2% (P<sub>in</sub> : 334.11 µW cm<sup>-2</sup> , P<sub>out</sub> : 137.66 µW cm<sup>-2</sup> ) under illumination from a commonly used indoor light-emitting diode light source (2956 K, 1062 lux). Furthermore, the device also achieves efficiencies of 29.45% (P<sub>out</sub> : 9.80 µW cm<sup>-2</sup> ) and 32.54% (P<sub>out</sub> : 54.34 µW cm<sup>-2</sup> ) at 106 (P<sub>in</sub> : 33.84 µW cm<sup>-2</sup> ) and 522 lux (P<sub>in</sub> : 168.21 µW cm<sup>-2</sup> ), respectively.