Abstract
Recently, many methods to measure the space charge distribution in solid dielectrics have been developed, such as the laser-induced pressure wave propagation (LIPP) method by means of the pulse laser, the pressure wave propagation (PWP) method by means of the piezo-electric transducer, and the pulsed electroacoustic (PEA) method. In this report, the resolution of PWP method using a piezo-electric transducer as a generator of acoustic pulse wave has been improved. To improve the resolution, a new technique to generate the narrow acoustic wave was employed. In consequence of the usage of this new technique, we have succeed to obtain the resolution of about 10 /spl mu/m. The principle and the result of this technique will be introduced here. Furthermore, a typical measurement result of carrier generation, drift and trapping in an organic photoconductor (OPC) will be introduced and compared with the result obtained using PEA method.
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