Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D34: Optical Spectroscopic Measurements of 2D Materials III
3:00 PM–5:48 PM,
Monday, March 6, 2023
Room: Room 226/227
Sponsoring
Unit:
FIAP
Chair: Sudi Chen, UC Berkeley
Abstract: D34.00002 : Tailoring Optoelectronic Properties of 2D Perovskites through Molecular Engineering*
3:12 PM–3:24 PM
Presenter:
Yulia Lekina
(Nanyang Technological University)
Authors:
Yulia Lekina
(Nanyang Technological University)
Benny Febriansyah
(National University of Singapore)
Ksenia Chaykun
(Nanyang Technological University)
Brandon Ong
(Nanyang Technological University)
John Hanna
(University of Warwick)
zexiang shen
(Nanyang Technological University)
In our work, we demonstrate the effect of the organic component on the optoelectronic properties of two-dimensional (2D) perovskites. Long flexible aliphatic molecules are apt to conformational transitions, affecting the lead iodide layers and thus the optoelectronic properties. Under high pressure, such 2D perovskite creates micrometre-scale band gap junctions that can be applied in novel optoelectronic devices. In contrast, short rigid bi-cation distorts the perovskite octahedra arrangement into corrugated layers with in-plane anisotropic properties; including excitons-phonon coupling, charge transfer, and photoluminescence energy. Substitution of organic hydrogen atoms by halogens such as fluorine or bromine improves moisture stability and, in some cases, switches the conformation of the molecule. Finally, if the organic component is a dye, it directly contributes to the optoelectronic properties, while the perovskite can be considered as a natural semiconductor heterostructure.
*The work is supported by MOE Singapore: AcRF RG156/19; RG57/21; MOE-T2EP50220-0020; MOE-T2EP50122-0015; MOE2016-T3-1-006 (S).
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