Vibrational properties of metastable orthorhombic BiSe.

Chalcogenide materials are being considered as some of the most promising systems for energy harvesting and energy conversion. Among them, the orthorhombic family of compounds XY (with X = Bi, Sb and Y = S, Se) has attracted special attention due to its interesting atomic structure and thermoelectric and optical properties. While BiS and SbSe have already been applied to solar cells, practical application of the new metastable BiSe is still a challenge due to the lack of data and knowledge on its properties.