  Spin-charge interconversion phenomena at the interface between magnetic
materials and topological insulators (TIs) are attracting enormous interest in
the research effort towards the development of fast and ultra-low power devices
for the future information and communication technology. We report a large
spin-to-charge conversion efficiency in Au/Co/Au/Sb2Te3/Si(111)
heterostructures based on Sb2Te3 TIs grown by metal organic chemical vapor
deposition on 4 inches Si(111) substrates. By conducting room temperature spin
pumping ferromagnetic resonance, we measure an inverse Edelstein Effect length
{\lambda}IEE up to 0.75 nm, a record value for 3-dimensional chalcogenide-based
TIs heterostructures. Our results open the path toward the use of chemical
methods to produce TIs on large area Si substrates and characterized by highly
performing spin-charge conversion, thus marking a milestone toward future
technology-transfer.
