Stable and efficient cathodo- and photoluminescence from ultrathin porous silicon layersстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Ultrathin porous Si layers (UPSLs) prepared on n-Si in aqueous NH4F solution and oxidized in air were investigated with cathode- (CL), photo- (PL) and electroluminescence (EL) and have been compared with conventionally prepared thick per-Si layers. The nanoporous structures were controlled with high-resolution scanning electron microscopy. Infrared spectroscopy was used for native oxide analysis. The luminescence properties of UPSLs were characterized by unusual high stability while conventionally prepared per-Si showed strong luminescence degradation. The CL spectra of UPSLs showed three peaks at 300, 400 and 560 nm and a shoulder about 620 nm. The PL and EL spectra of UPSLs were peaked at 620 and 800 nm, respectively. The role of native oxide formation for stable per-Si luminescence is discussed.