Patent attributes
The present invention provides a high-sensitivity, carrier-resolved photo-Hall and photoelectromagnet (PEM) system utilizing multiple parallel dipole line (PDL) magnet systems. In one aspect of the invention, a Hall measurement apparatus is provided. The Hall measurement apparatus includes: a measurement chamber (e.g., a cryostat); a Hall module having at least one freely-rotating cylindrical magnet within the measurement chamber; a motor-driven cylindrical magnet adjacent to the at least one freely-rotating cylindrical magnet; an optical module for photo-Hall measurement, a set of electronics instruments and a data and signal analysis program for n-th harmonics lock-in detection of magnetoresistance signal and a control program. The system yields majority carrier type, density and mobility and, with illumination, minority carrier mobility and density.
