Indium(II) selenide (InSe) is an inorganic compound composed of indium and selenium. It is a III-VI layered semiconductor. The solid has a structure consisting of two-dimensional layers bonded together only by van der Waals forces. Each layer has the atoms in the order Se-In-In-Se.
Potential applications are for field effect transistors, optoelectronics, photovoltaic, non-linear optics, strain gauges, and methanol gas sensors.