Inverse problem solving in semiconductor photoacoustics by neural networks

We developed a method of inverse problem solving in semiconductor photoacoustics based on neural networks application. Simple structured neural networks, trained on a large set of data obtained by the well - known theoretical models in the 20 Hz-20 kHz modulation frequency range, are applied to dete...

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Bibliographic Details
Published inInverse problems in science and engineering Vol. 29; no. 2; pp. 248 - 262
Main Authors Djordjevic, Katarina Lj, Markushev, Dragan D., Ćojbašić, Žarko M., Galović, Slobodanka P.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 01.02.2021
Subjects
artificial neural networks
experimental signal
inverse problem
n - type silicon
photoacoustic
photothermal
Semiconductors
thermal distribution
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Summary:We developed a method of inverse problem solving in semiconductor photoacoustics based on neural networks application. Simple structured neural networks, trained on a large set of data obtained by the well - known theoretical models in the 20 Hz-20 kHz modulation frequency range, are applied to determine thermal diffusivity, coefficient of linear expansion and thickness of n - type silicon samples, using undistorted experimental photoacoustic signals. The efficiency of the neural networks was tested depending on the type of input data, showing the best performances in the case when signal amplitudes and phases are simultaneously presented to the network. Real - time parameter prediction is achieved together with high accuracy and reliability allowing one to perform the full characterization of a sample in the frequency domain.
ISSN:1741-5977
1741-5985
DOI:10.1080/17415977.2020.1787405