Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics II (joint session HL/KFM)
HL 45.13: Talk
Thursday, March 20, 2025, 12:45–13:00, H13
Circular Dichroism Engineering via Bismuth Doping and Cation Substitution in 2D Lead-Halide Perovskites — •Jan-Heinrich Littmann1, Keito Mizukami1,2, Henrik Spielvogel1, Philip Klement1, Satoko Fukumori2, Hirokazu Tada2, and Sangam Chatterjee1 — 1Institute of Experimental Physics I and Center for Materials Research (ZfM), Justus Liebig University Giessen, Giessen, Germany — 2Graduate School of Engineering Science, Osaka University, Japan
Hybrid lead halide perovskites have garnered significant attention for their remarkable semiconductor properties. Their building blocks allows for tuneable features such as the crystal structure and the electronic bandgap. Introducing chiral cations into these materials endows them with chiroptical properties, such as circularly polarized luminescence (CPL) and spin-polarized charge transport, promising applications in optoelectronics and spintronics. However, the mechanism of chirality transfer remains poorly understood due to complex structure-property relationships. This study delves into the impact of heterovalent Bi3+ doping on the genuine circular dichroism (CD) of 2D lead iodide perovskites incorporating methylbenzylamine (MBA) and (pyridyl)ethylamine (PyEA) cations. Bi3+ doping, while preserving the band gap, significantly influences the genuine CD, suggesting a doping-dependent chirality transfer mechanism. Our findings provide valuable insights into the structure-property relationships in chiral perovskites and pave the way for the rational design of advanced chiroptical materials.
Keywords: Circular Dichroism; Doping; Hybrid Metal Halide Perovskites