Salt-assisted promotion of large dimensional growth of Bi2O2Se

Bi 2 O 2 Se exhibits broader application prospects compared to other two-dimensional materials due to its high electron mobility , optimal band gap and good environmental stability. In this paper, large-area high-quality 2D Bi 2 O 2 Se single-crystal nanosheets were synthesized via a NaCl-assisted chemical vapor deposition (CVD) approach. It was found that the addition of a modest amount of NaCl effectively promoted the transverse growth of 2D Bi 2 O 2 Se, resulting in larger dimensions. At the same time, the effects of varying NaCl concentrations on the growth of 2D Bi 2 O 2 Se were investigated, elucidating the underlying growth mechanisms. Additionally, various halogen salt-assisted growth experiments were conducted to explore the differential effects of distinct halogen salts on the process. The results indicate that the salt-assisted method significantly enhances the growth process, offering novel insights for the large-scale synthesis of 2D Bi 2 O 2 Se.