With the rapid development of two-dimensional materials research, more and more new two-dimensional materials have begun to enter the field of vision of researchers. From the earliest discovered graphene to the two-dimensional transition metal dichalcogenides (TMDs) that are currently being studied, the emergence of each new material will be accompanied by a new research upsurge. The discovery of TMDs has greatly compensated for the shortcoming of graphene’s zero energy gap, enabling the release of the potential of two-dimensional materials in applications such as logic devices and optoelectronic devices. Since the thickness of 2D materials itself is only nanoscale, large-area 2D materials have natural flexibility and have great prospects in the application of flexible electronic/photonic devices in the future. Nevertheless, the preparation of high-quality 2D materials is a long-standing problem for researchers.

Unlike most other TMDs 2D materials that have been widely studied, such as molybdenum disulfide (MoS2), tungsten diselenide (WSe2), etc., ReSe2 has anisotropic properties in addition to its conventional optoelectronic properties. Simply put, if measurements are taken along different directions of the hexagonal ReSe2, then we can get significantly different performance data. This novel property originates from the special atomic structure inside ReSe2. In the two-dimensional ReSe2 atomic crystal structure, there is a firm Re4 "diamond-like" chain, and it is precisely because of the existence of such a chain that the properties deviating from this chain orientation are significantly different, that is, anisotropy. Zhai Tianyou's research group from the Department of Materials, Huazhong University of Science and Technology also demonstrated the anisotropic characteristics of ReSe2 hexagonal crystals intuitively and in detail for the first time through polarized Raman spectroscopy, and on this basis constructed a high-performance two-dimensional photodetector. device.

The high-quality ReSe2 2D crystal not only further enriches the number of members of the TMDs family, but also provides a solid foundation for the future research and application of novel properties of anisotropic materials. Juna Group's low-dimensional materials online, providing ReSe2 materials with excellent performance. It has made great progress in the research of materials in China.