Tailoring Photoluminescence by Strain-Engineering in Layered Perovskite Flakes
arxiv(2024)
Abstract
Strain is an effective strategy to modulate the optoelectronic properties of
2D materials, but it has been almost unexplored in layered hybrid
organic-inorganic metal halide perovskites (HOIPs) due to their complex band
structure and mechanical properties. Here, we investigate the
temperature-dependent microphotoluminescence (PL) of 2D
(C_6H_5CH_2CH_2NH_3)_2Cs_3Pb_4Br_13 HOIP subject to biaxial strain induced
by a SiO_2 ring platform on which flakes are placed by viscoelastic stamping.
At 80 K, we found that a strain of <1
peak (unstrained) to three well-resolved peaks. Supported by micro-Raman
spectroscopy, we show that the thermomechanically generated strain modulates
the bandgap due to changes in the octahedral tilting and lattice expansion.
Mechanical simulations demonstrate the coexistence of tensile and compressive
strain along the flake. The observed PL peaks add an interesting feature to the
rich phenomenology of photoluminescence in 2D HOIPs, which can be exploited in
tailored sensing and optoelectronic devices.
MoreTranslated text
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined