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Type: Artigo de periódico
Title: Photoreflectance and time-resolved photoreflectance in delta-doped superlattices
Author: de Sousa, DF
Bell, MJV
Nunes, LAO
Abstract: this paper we report a detailed study of photoreflectance (PR) in delta-Si:GaAs superlattices. PR spectra yield three contributions: (1) from intrinsic GaAs; (2) Franz-Keldysh oscillations (FKO) due to the surface electric field, whose value is explained by a simple capacitor model; and (3) FKO attributed to the buffer/superlattice interface. We observed the photovoltaic effect due to the probe beam in the PR arrangement and achieved surface voltage reductions up to 30%. We also present a time-resolved PR technique, which allows us to discriminate these contributions in the time domain and gives us the PR characteristic decay times. (C) 1998 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.367039
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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