Importance of tailoring lattice strain in halide perovskite crystals

By Hui‐Seon Kim, N. Park. NPG Asia Materials, 2020

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In this review paper, the residual strain of a polycrystalline halide perovskite film is systematically studied based on its structural inhomogeneity, which is closely correlated to the local carrier dynamics caused by a modulated electronic band structure. Long-range collective strain ordering is responsible for the overall structural properties, consequently determining the optoelectronic properties of the perovskite film. Notably, the perovskite phase stability is strongly affected by the internal strain, favoring a lower energy state. The important parameters affecting the residual strain in a real perovskite film, ranging from thermal stress to lattice mismatch and compositional inhomogeneity, are subsequently introduced along with their impacts on the optoelectronic properties and/or the stability of the crystals. Methods for using strain to improve the performance of a promising solar cell material have been reviewed by researchers in South Korea. A family of hybrid organic-inorganic semiconductors known as halide perovskites have emerged as a rival to silicon for the production of solar cells. Atomic-level physical forces, for example, the strain induced when a material is compressed, can improve the semiconductor’s optoelectronic properties. Hui-Seon Kim from Inha University in Incheon, and Nam-Gyu Park from Sungkyunkwan University in Suwon have summarized how this strain arises in perovskite thin films and the ways in which it modifies the dynamics of the material’s electrical charge carriers. The researchers used this understanding to suggest methods for strain engineering these materials to improve the performance of solar cell devices. The structural inhomogeneity is inherited by residual strain in perovskite crystals. The residual strain affects an electronic band structure of the perovskite film and thus determines its optoelectronic properties. Therefore, the strain engineering can be a powerful tool to not only govern structural defects but also derive demanding properties with an ensured phase stability. In this review, the effect of lattice strain is broadly explored, coupled with relevant affecting parameters.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a3036225402b51138f80134bace23b28d1d20557

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