Regensburg 2025 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.20: Poster
Montag, 17. März 2025, 18:30–20:30, P1
Thermoelectricity in Bi-directionally Strained CsSnI3 Perovskite — •Michele Reticcioli1, Mariangela Ruggeri2, Giovanna D’Angelo2, and Alessandro Stroppa1 — 1CNR-SPIN L’Aquila, Italy — 2Università degli Studi di Messina, Italy
Thermoelectric materials play a pivotal role in energy sustainability, converting waste heat into electricity without moving parts or emissions. Recent advances spotlight metal halide perovskites, such as CsSnI3, as promising candidates for eco-friendly thermoelectric applications due to their low thermal conductivity and high electrical efficiency. In this work, we explore the influence of bidirectional strain on the orthorhombic gamma-phase of CsSnI3 using density functional theory (DFT), complemented by experimental insights from our collaborators. Strain effects, ubiquitous in thin films grown on mismatched substrates, are known to modify electronic structures and transport properties. Our findings reveal a peculiar dependence of the bandgap on strain direction and intensity. These changes directly impact the thermoelectric properties, including the Seebeck coefficient and figure of merit, emphasizing the interplay between strain-induced electronic modulation and thermoelectric performance. This study contributes to the growing understanding of strain effects in perovskites, offering valuable insights into their potential for thermoelectric applications.
Keywords: thermoelectricity; perovskite; DFT