EVALUATION OF ELECTRICAL-PROPERTIES OF BASIC FUCHSIN DYE BY SPACE-CHARGE-LIMITED CURRENT MEASUREMENTS

The measured electrical properties of basic fuchsin (BF) dye available in pellet form of thicknesses ranging from 620 to 1100 mu m have been reported. It has been observed that at room temperature the current d ensity-electric field (J-epsilon) characteristics of these materials d isplay Ohmic behaviour at low fields, but at higher fields the space-c harge-limited (SCL) conductivity controlled by an exponential distribu tion of traps above the valence band edge has been noticed. The measur ement of current density (J) as a function of the temperature (T) in t hese materials showed voltage variable slopes on plots of log J versus 1/T curves in accordance with the theory of exponential trap distribu tions. Analyzing the experimental results, the values of electrical pa rameters namely dielectric constant, carrier density, carrier mobility , concentration of traps per unit energy range at the valence band-edg e, effective density of states in the valence band, temperature parame ter of trap distribution and the total trapping concentration of the m aterial have been estimated.