2 research outputs found

    Exploring the Effects of the Pb<sup>2+</sup> Substitution in MAPbI<sub>3</sub> on the Photovoltaic Performance of the Hybrid Perovskite Solar Cells

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    Here we report a systematic study of the Pb<sup>2+</sup> substitution in the hybrid iodoplumbate MAPbI<sub>3</sub> with a series of elements affecting optoelectronic, structural, and morphological properties of the system. It has been shown that even partial replacement of lead with Cd<sup>2+</sup>, Zn<sup>2+</sup>, Fe<sup>2+</sup>, Ni<sup>2+</sup>, Co<sup>2+</sup>, In<sup>3+</sup>, Bi<sup>3+</sup>, Sn<sup>4+</sup>, and Ti<sup>4+</sup> results in a significant deterioration of the photovoltaic characteristics. On the contrary, Hg-containing hybrid MAPb<sub>1–<i>x</i></sub>Hg<sub><i>x</i></sub>I<sub>3</sub> salts demonstrated a considerably improved solar cell performance at optimal mercury loading. This result opens up additional dimension in the compositional engineering of the complex lead halides for designing novel photoactive materials with advanced optoelectronic and photovoltaic properties

    Probing the Intrinsic Thermal and Photochemical Stability of Hybrid and Inorganic Lead Halide Perovskites

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    We report a careful and systematic study of thermal and photochemical degradation of a series of complex haloplumbates APbX<sub>3</sub> (X = I, Br) with hybrid organic (A<sup>+</sup> = CH<sub>3</sub>NH<sub>3</sub>) and inorganic (A<sup>+</sup> = Cs<sup>+</sup>) cations under anoxic conditions (i.e., without exposure to oxygen and moisture by testing in an inert glovebox environment). We show that the most common hybrid materials (e.g., MAPbI<sub>3</sub>) are intrinsically unstable with respect to the heat- and light-induced stress and, therefore, can hardly sustain the real solar cell operation conditions. On the contrary, the cesium-based all-inorganic complex lead halides revealed far superior stability and, therefore, provide an impetus for creation of highly efficient and stable perovskite solar cells that can potentially achieve pragmatic operational benchmarks
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