Abstract
By using photovoltaic spectroscopy and contactless electroreflectance spectroscopy, large electric field was found to exist in wurztite GaN/InGaN/AlGaN multilayer structures. The electric field strengths in the GaN layer and the AlGaN layer were obtained from the analysis of the Franz–Keldysh oscillations in contactless electroreflectance spectra. These electric fields were attributed to be induced by the piezoelectric effect in wurztite nitride systems.
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