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. 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. Based on these characteristics, the device characteristics of detecting IR near 1200 nm region were verified. 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.
Funding: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT & Future Planning (NRF-2019R1A2C1006972, NRF-2020R1A2C2010984) and funded by the Ministry of Education (NRF-2019R1F1A1063170). Also, this research was partially supported by Korea Institute for Advancement of Technology (KIAT) through the International Cooperative R&D program. (Project No. P0005436).Funding: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) , funded by the Ministry of Science, ICT & Future Planning ( NRF-2019R1A2C1006972 , NRF-2020R1A2C2010984 ) and funded by the Ministry of Education ( NRF-2019R1F1A1063170 ). Also, this research was partially supported by Korea Institute for Advancement of Technology (KIAT) through the International Cooperative R&D program. (Project No. P0005436 ).
