Title :
Comparison between PWP method using piezo-electric transducer and PEA method
Author :
Takada, Tatsuo ; Satoh, Yuki ; Tanaka, Yasuhuo
Author_Institution :
Electron. Meas. Lab., Musashi Inst. of Technol., Tokyo, Japan
Abstract :
The resolution of the pressure wave propagation (PWP) method using a piezo-electric device as a generator of acoustic pulse waves has been improved and applied to observe the generation, drift, and trapping of carriers in an organic photoconductor (OPC). To improve the resolution, a new technique to generate the narrow acoustic pulse wave was used. Applying a step-like voltage to the thin PVDF film, a pulsed acoustic pressure wave was obtained, with a resulting resolution of about 10 μm. In this report, the principle and the result of this technique are introduced. Furthermore, the measurement result applied to the OPC is compared with that obtained using the pulsed electroacoustic (PEA) method
Keywords :
acoustic applications; acoustic pulses; acoustic transducers; carrier mobility; charge measurement; hole traps; organic compounds; organic semiconductors; photoconducting materials; piezoelectric transducers; space charge; acoustic pulse wave generation; carrier drift; carrier generation; carrier trapping; hole trapping; organic photoconductor; piezo-electric transducer; pressure wave propagation method; pulsed acoustic pressure wave; pulsed electroacoustic method; resolution; space charge distribution; step-like voltage; thin PVDF film; Acoustic measurements; Acoustic propagation; Acoustic pulses; Acoustic transducers; Acoustic waves; Photoconducting devices; Pulse generation; Pulse measurements; Pulsed electroacoustic methods; Voltage;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578098
