INVESTIGATION OF ACCEPTOR LEVELS AND HOLE SCATTERING MECHANISMS IN P-GALLIUM SELENIDE BY MEANS OF TRANSPORT MEASUREMENT UNDER PRESSURE

The effect of pressure on acceptor levels and hole scattering mechanis ms in p-GaSe is investigated through Hall effect and resistivity measu rements under quasi-hydrostatic conditions up to 4 GPa. The pressure d ependence of the hole concentration is interpreted through a carrier s tatistics equation with a single (nitrogen) or double (tin) acceptor w hose ionization energies decrease under pressure due to the dielectric constant increase. The pressure effect on the hole mobility is also a ccounted for by considering the pressure dependencies of both the phon on frequencies and the hole-phonon coupling constant involved in the s cattering rates.