In1.7Cu0.3Se2.7

In₁.₇Cu₀.₃Se₂.₇ is a quaternary semiconductor compound combining indium, copper, and selenium in a layered chalcogenide structure. This material is primarily of research interest for optoelectronic and photovoltaic applications, particularly in thin-film solar cells and photodetectors where its tunable bandgap and high absorption coefficient offer advantages over conventional binary selenides. The copper doping modifies electronic properties relative to parent indium selenide, making it notable in exploratory studies of next-generation photovoltaic absorbers and IR-sensitive devices.