Photomodulated Second-Harmonic Generation at Silicon-Silicon Oxide Interfaces: From Modeling to Application

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Abstract

A photomodulation technique based on the nonlinear-optical process of second-harmonic generation (SHG) is developed for characterizing Si/SiO2 interfaces and silicon-based metal-oxide-semiconductor (MOS) structures. The mechanisms of photoinduced SHG are discussed and a quantitative model of the SHG response is formulated. A method of extracting parameters of the Si/SiO2 interface from in situ-photomodulated-SHG measurements is proposed. The accuracy of the technique for measuring parameters of silicon-based MOS structures is estimated.

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