Characterization of the bipolar mobility in polar materials by interband photoexcitation

Pietro Bernasconi, Germano Montemezzani, Ivan Biaggio, Peter Günter
1997 Physical Review B (Condensed Matter)  
We present a purely optical method to determine the effective electron-hole mobility ratio in electro-optic, photoconductive materials. Our technique combines observations of the dynamics of the interband photoconductivity with the determination of the anisotropy of the response time of a light induced space-charge electric field. In KNbO 3 single crystals we measured a trap-limited mobility ratio h c / e c ϭ1.25Ϯ0.15 along the crystallographic c axis and h b / e b ϭ2.0Ϯ0.4 along the b axis.
doi:10.1103/physrevb.56.12196 fatcat:wzjtdyb5szfzbanch5xrbbhwpu