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Acoustic Technique for Study of the Surface Nonequilibrium Processes in Piezoelectric Semiconductors

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Acoustic detection technique based on the sensitivity of the mechanism of the direct acoustic generation in the piezoelectric semiconductor is presented. The surface acoustic generation due to the applied high frequency electric field at the surface is distinctly measurable. Being significantly dependent on the physical conditions in the surface layer, it may be used as a useful tool for the examination of the surface relaxation processes arising after the switching on the incident light exciting the surface of the piezoelectric semiconductor. Characteristic feature of the presented method is that one component of the wave is generated precisely (within several interatomic distances) at the examined surface (optical methods offer information lokalized within the light penetration depth). The (110) surface of GaAs:Cr has been taken as an example and the acoustic generation has been studied in the transient regime. The information has been supplemented by the transient photoconductivity measurement at the surface in order to be able to estimate the role of the two actual mechanism's of the acoustic generation and to separate that one connected with the relaxation processes behind the depletion layer.
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Document Type: Research Article

Publication date: March 1, 2003

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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