Pressure effects on charge injection currents in anthracene crystals

Recent succesfull construction of high-resistance electrical plugs for applications in gaseous high-pressure chambers allowed an investigation of pressure effects on the low currents injected to insulating organic materials of which anthracene crystals is a model example. An analysis of the prelimnary experimental data on the dark and photo-enhanced space charge limited currents showed the pressure modification of the current values and shape of their voltage and lighht intensity characteristics to be more stronger than that resulting from the standard theoretical description involving the crystal compressibilities determined by observing piston displacement in a static high-pressure apparatus. In order to understand the physical reasons for this discrepancy we have undertaken more systematic studies of charge injection to anthracene crystals under high pressure, the results described in the present report.