Photopyropiezoelectric elastic bending method
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AuthorsTodorović, D. M.
Nikolić, Pantelija M.
Bojičić, Aleksandar I.
Vasiljević Radović, Dana
Conference object (Published version)
American Institute of Physics
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A method of investigation of semiconductors and metal–semiconductor structures based on two techniques: The elastic bending technique and pyropiezoelectric (PPE) technique was presented. The method was demonstrated on a metal–semiconductor–metal (MSM) structure, which is attached to a PPE detector. Two different ac voltages can be measured: One on the electrodes of MSM structure—the ac-photovoltage, and another on the electrodes of the PPE detector—the PPE voltage. The ac photovoltage is a consequence of the photogenerated plasma processes in the sample (MSM structure). Photogenerated plasma waves in a semiconductor are followed by the thermal and elastic waves (the elastic bending). Then, the pyroelectric voltage is a consequence of the thermal processes and the piezoelectric voltage is a consequence of elastic bending in the sample-PPE detector system. A theoretical model for a metal–semiconductor–metal-pyro(piezo)electric system is given including the space-charge regions and electr...onic states on the semiconductor surfaces, thermodiffusion, thermoelastic, and electronic deformation effects in a semiconductor. The photoelectric and pyropiezoelectric effects are investigated by analyzing the ac voltages as a function of the modulation frequency of excitation beam.
Keywords:thermal diffusivity / photoacoustic effect / thermal effusivity
Source:Review of Scientific Instruments, 2003, 74, 1, 635-638
- AIP Publishing
- Ministry of Science, Technology and Development, Republic of Serbia, Grant No. I.T.1.04.0062.B
- Conference: 12th International Conference on Photoacoustic and Photothermal Phenomena (12 ICPPP) Location: Toronto, Canada; Date: JUN 24-27, 2002
ISSN: 0034-6748; 1089-7623