What is it about?

The two-dimensional (2D) inorganic material Nb3I8, which can be separated into atomic planes, was synthesized through a vapor transport reaction between niobium and iodine.

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Why is it important?

High-purity and cm scale large Nb3I8 crystals were obtained by controlling the growth temperature (600–700 °C) and the stoichiometric ratio between niobium and iodine (using excess I2 condition, niobium: iodine = 3:9). The semiconductor characteristics were measured by the change of electrical conductivity with temperature (increased conductivity with temperature in the range of 100 K–300 K), and have a band gap of ∼1 eV (∼1200 nm) through Infrared (IR)-visible light absorption analysis.


Besides few-layers of Nb3I8 was acquired by the mechanical exfoliation method, and experimentally observed by atomic force microscopy (AFM). This 2D material is expected to have an important role in developing another 2D materials and in new nano-optoelectronic devices using it.

Dr. Sitansu Sekhar Nanda
Myongji University

Read the Original

This page is a summary of: Large-area synthesis of van der Waals two-dimensional material Nb3I8 and its infrared detection applications, Journal of Alloys and Compounds, August 2020, Elsevier,
DOI: 10.1016/j.jallcom.2020.154877.
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