Temperature-Dependent Optical and Structural Properties of Chiral Two-Dimensional Hybrid Lead-Iodide Perovskites

材料科学 热膨胀 铁电性 带隙 三元运算 凝聚态物理 光电子学 结晶学 电介质 化学 物理 计算机科学 冶金 程序设计语言
作者
İbrahim Dursun,Maxwell W. Terban,Yuanze Xu,Xiaoyu Zhang,Sanjit Ghose,Ming‐Xing Li,Pranab Sarker,Hao Li,Mircea Cotlet,Tao Wei,Deyu Lu,Qiuming Yu
出处
期刊:Journal of Physical Chemistry C [American Chemical Society]
卷期号:127 (31): 15423-15434 被引量:5
标识
DOI:10.1021/acs.jpcc.3c04296
摘要

Layered hybrid halide perovskites gain chirality via the incorporation of chiral organic cations in the spacer layer. These so-called chiral two-dimensional (2D) halide perovskites have attracted considerable interest recently for chiral optoelectronic, spintronic, and ferroelectric applications. However, the effect of temperature on these materials, especially how the structure changes with temperature and its impact on the chiral optoelectronic properties, remains an open question. Here, we study the effect of temperature change on chiral optoelectronic and structural properties through temperature-dependent circularly polarized photoluminescence (CPPL) microscopy and synchrotron powder X-ray diffraction as well as pair distribution function analysis to elucidate the intrinsic chiral optoelectronic and structural variations for R-, S-, and racemic-methylbenzylamine lead iodide. Our results show that the temperature-induced band gap changes indicate a strong electron–phonon coupling compared to the thermal-induced lattice expansion in chiral 2D perovskites. From powder diffraction measurements, a monotonic lattice expansion is observed on heating with no structural phase transitions over 90–360 K detected for the three samples studied herein. Locally, a strongly anisotropic and even negative expansion in some components of the instantaneous Pb–I pair-distance distribution is suggestive of coupling between dynamical intralayer distortions and lattice expansion. This work provides insights into the fundamental understanding of the temperature effect on chiral optoelectronic and structural properties of chiral 2D perovskites, which can lead to new chiral materials design strategies for future chiral optoelectronic applications.
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