Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 9, Issue 19, Pages 6166-6172Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc01322j
Keywords
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Funding
- National Nature Science Foundation of China [51872100]
- Hubei Provincial Natural Science Foundation of China [2019CFA002]
- Fundamental Research Funds for the Central University [2019kfyRCPY059]
- Foundation of Shenzhen Science and Technology Innovation Committee [JCYJ20180504170444967, JCYJ20200109105422876]
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In-plane anisotropy (IPA) refers to angle-dependent properties defined by asymmetric structure, which can be introduced into isotropic materials for enhanced control of properties. Experimental results demonstrate the spread of IPA from anisotropic to isotropic materials in ultrathin heterostructures, showcasing the feasibility of extending the applications of intrinsic isotropic two-dimensional materials in angle-dependent fields.
In-plane anisotropy (IPA) refers to in-plane angle-dependent properties defined by asymmetric structure, which renders an additional control for precise modulation of properties. In contrast, most known materials are of isotropic structure without obvious IPA. Thus, the introduction of anisotropy into isotropic materials, integrating the merits of both, is becoming an interesting and worthwhile area of study. Herein, we demonstrate experimentally the spread of IPA from anisotropic ReS2 to isotropic cubic CsPbBr3 (CPB) based on epitaxially grown CPB/ReS2 heterostructures. Angle-resolved photoluminescence (PL) spectra reveal that the PL pattern of the CPB single crystal evolves from an individual isotropic round shape into an anisotropic dumb-bell shape, with its polar axis oriented along the b-axis of ReS2 beneath CPB in heterostructures, indicating a significant substrate-induced optical isotropy-anisotropy transition. This study verifies the feasibility of spreading IPA with proximity effects in ultrathin heterostructures, extending the applications of intrinsic isotropic two-dimensional materials in angle-dependent fields.
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