Method and arrangement for the response analysis of semiconductor materials with optical excitation

摘要

The invention is directed to a method and an arrangement for the response analysis of semiconductor materials with optical excitation. The object of the invention, to find a new type of response analysis of semiconductor materials with optical excitation which also allows a sufficiently precise detection of the charge carrier wave with a higher excitation output and a shorter charge carrier lifetime, is met according to the invention in that an exciting laser beam is intensity- modulated with two discrete modulation frequencies (&OHgr;.sub.1 ; . OMEGA..sub.2), the luminescent light exiting from the object is measured on the difference frequency (&OHgr;.sub.1 -&OHgr;.sub.2), and the luminescent light is analyzed as a function of the arithmetic mean (. OMEGA.) of the modulation frequencies (&OHgr;.sub.1 ; &OHgr;.sub.2). The invention is applied in the semiconductor industry for determining different electrical parameters of semiconductor materials.