Inter-conduction band electron relaxation dynamics in 6H-SiC

The ultrafast inter-conduction band carrier dynamics in 6H-SiC was observed by using pump and probe transient absorption technique. Probe wavelength d ependence of the bleaching was compared with the steady-state absorption pr ofiles for polarizations parallel and perpendicular to the c axis, and thes e bleachings were ascribed to the decrease of electron populations in the l owest conduction band. The relaxation time from the higher to the lowest co nduction band due to the inter-conduction band electron-phonon scattering i s 1.25 ps. (C) 2001 American Institute of Physics.