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Zahirovic, Indira
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document
Solution-Processed Bismuth(III)-Based Halide Perovskites as Absorber Materials for Photovoltaic Applications
Abstract
Bismuth(III) halide perovskites are promising alternative absorber materials to commonly used organolead- and organotin-based perovskites due to the low toxicity and ambient stability.<sup>[1]</sup> In this work, hybrid organic-inorganic bismuth(III) halide perovskites based on methylammonium (CH<sub>3</sub>NH<sub>3</sub><sup>+</sup>, MA<sup>+</sup>) as A-site cation and halide counter ions (I<sup>-</sup>, Cl<sup>-</sup>) incorporated on the X-site of the perovskite structure were investigated using bismuth(III) halides (BiI<sub>3</sub>, BiCl<sub>3</sub>) and methylammonium iodide (MAI) as starting compounds. The perovskite absorber materials (MA<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>, MA<sub>3</sub>Bi<sub>2</sub>I<sub>9-x</sub>Cl<sub>x</sub>) were prepared in a low-temperature solution-based processing route following a one-step and two-step procedure.<sup>[2,3]</sup> The absorber materials were evaluated with regard to their photovoltaic performance in organic (PEDOT:PSS) as well as in planar (c-TiO<sub>2</sub>) and meso-structured (c-TiO<sub>2</sub>/mp-TiO<sub>2</sub>) perovskite solar cell architecture (Fig. 1). In addition, the perovskites were characterized optically (UV/VIS spectroscopy, light microscopy), structurally (X-ray diffraction), andmorphologically (atomic force microscopy).