光致发光
材料科学
拉曼光谱
应变工程
钙钛矿(结构)
拉伤
带隙
光电子学
纳米技术
结晶学
光学
化学
医学
物理
硅
内科学
作者
Davide Spirito,María Barra‐Burillo,Francesco Calavalle,Costanza Lucia Manganelli,Marco Gobbi,Rainer Hillenbrand,Fèlix Casanova,Luis E. Hueso,Beatriz Martín‐García
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-04-18
卷期号:22 (10): 4153-4160
被引量:9
标识
DOI:10.1021/acs.nanolett.2c00909
摘要
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 (C6H5CH2CH2NH3)2Cs3Pb4Br13 HOIP subject to biaxial strain induced by a SiO2 ring platform on which flakes are placed by viscoelastic stamping. At 80 K, we found that a strain of <1% can change the PL emission from a single 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.
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