Journal
ADVANCED MATERIALS
Volume 33, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202101505
Keywords
chiral 2D materials; in-plane anisotropy; NbOI; (2)
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Funding
- National Natural Science Foundation of China [21825103]
- Research Program of the Chinese Academy of Sciences [E01YQZ18]
- Shanghai Super Postdoctoral [E01SCB19]
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Research has shown that two-dimensional niobium oxide diiodide (NbOI2) exhibits highly anisotropic optical and electrical properties, with significant anisotropic optical absorbance and photoresponsivity, making it suitable for novel polarization-sensitive optoelectronic applications.
Exploring in-plane anisotropic 2D materials is of great significance to the fundamental studies and further development of polarizationsensitive optoelectronics. Herein, chiral niobium oxide diiodide (NbOI2) is introduced into the intriguing anisotropic 2D family with the experimental demonstration of anisotropic optical and electrical properties. 2D NbOI2 crystals exhibit highly anisotropic dispersed band structures around the Fermi surface and strong in-plane anisotropy of phonon vibrations owing to the different bonding modes of Nb atoms along the b- and c-axes. Consequently, the anisotropic factors of optical absorbance and photoresponsivity in 2D NbOI2 crystals reach up to 1.75 and 1.7, respectively. These anisotropic properties make 2D NbOI2 an interesting platform for novel polarization-sensitive optoelectronic applications.
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