Authors:

Kamran Hajibayli

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About Paper:

The solar energy industry has been dominated by crystalline silicon technologies; however, alternative materials like perovskites, with an ABX3 crystal structure, have seen extensive research over the past decade. Recently, the focus on lead halide perovskites has increased due to their cost-effectiveness, ease of processing, and high efficiency. Nevertheless, the instability and toxicity of lead in these perovskites have spurred research into chalcogenide perovskite materials, which use S, Se, and Te as anions instead of halides. Among these, BaZrS3 is the most researched, known for its desired distorted perovskite crystal structure and potential beneficial properties similar to halide perovskites. The initial task for our project was to determine the alloying potential of BaZrS3 with SrZrS3, which crystallizes in a needle-like phase at lower temperatures. The main goal is to identify the stoichiometry range that produces the perovskite phase at lower temperatures. The procedure for the project was solution-based colloidal synthesis, performed for both materials through thermal decomposition via heat up. The primary methods for establishing the perovskite phase are via powder X-ray diffraction (pXRD) and Transmission Electron Microscopy (TEM). We aim to verify where the perovskite phase of the barium zirconium sulfide and strontium zirconium sulfide alloy is most stable. Current observations of pXRD and TEM measurements show that a barium- rich stoichiometry gives a more stable perovskite phase. In the future, the fabrication of these alloyed materials into thin films will be studied to characterize their optoelectronic properties and determine their potential for device applications. Keywords: Chalcogenide Perovskites; Alloy; Solar Energy; Stoichiometry

Source:

Purdue University / 2024

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Co-authors:

Kamran Hajibayli