The three‐dimensional distribution of minority carriers is calculated in a semi‐infinite semiconductor with arbitrary surface recombination. The optical probe is modelled as an exponentially decaying Gaussian so that the effects of a finite probe width may be considered. The reliability of the infinite diffusion length limit is shown to depend on the surface recombination velocity.
The interaction is considered of a focused light beam with a semi-infinite semiconductor and the volume discussed which the photogenerated carriers probe. An information depth is introduced, within which the majority of the carriers are generated, and the effects are discussed of diffusion length, surface recombination velocity, and probe objective lens numerical aperture. The application of the results to photoluminescence studies is also considered.Es wird die Wechselwirkung eines fokussierten Lichtstrahles mit einem halbunendlichen Halbleiter betrachtet und das Volumen diskutiert, das die photogenerierten Trager sondiert. Eine Informationstiefe wird eingefiihrt, innerhalb derer die Majoritat der Ladungstrager generiert wird, und der EinfluIJ der Diffusionslange, Oberflachenrekombinationsgeschwindigkeit und der numerischen Apertur der Sondenobjektivlinse werden diskutiert. Die Anwendung der Ergebnisse auf Photolumineszenzuntersuchungen wird ebenfalls betrachtet.
L2 DV 2 p ( r , x) --P ( T , z ) = --g(r, 2 ) 3 1) Parks Road, Oxford OX1 3PJ, Great Britain. 41 physica (a) 103/2
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.