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Pulsed Photoacoustic Effect in Semiconductors

Acoustic and thermal components of signal waveforms generated in Si and CdS samples, which are irradiated by Nd:YAG and Ruby laser pulse, are detected by PZT and PVF2 transducers over a time range of 0.1 µs to several ms. The sound velocity of propagating longitudinal wave and the vibration modes of the sample can be analyzed from the acoustic wave components while the thermal characteristics of the samples can be analyzed from the thermal wave component. It is shown that the difference in the thermal conversion efficiency of photon energy in Si and CdS affects the peak values of the thermal component in the waveforms.