Topic
Potential well
About: Potential well is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 30812 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, it is demonstrated that the blue emission is due to direct transitions in silicon nanocrystallites which are caused by a quantum confinement effect, and a model is proposed to understand the enhancement of the direct transitions.
Abstract: Intense blue luminescence with decay lifetimes of 100–500 ps is observed from nanocrystalline silicon thin films at room temperature. The grain size reduction of the silicon crystallites to 3–5 nm leads to the generation of the luminescence. It is demonstrated that the blue emission is due to direct transitions in silicon nanocrystallites which are caused by a quantum confinement effect. The contribution of silicon dioxide to the blue emission is excluded. A model is proposed to understand the enhancement of the direct transitions in silicon nanocrystallites.
30 citations
••
TL;DR: In this article, ultrathin amorphous Ge films (2 to 30 nm in thickness) embedded in SiO2 layers were grown by magnetron sputtering and employed as a light sensitizer in photodetector devices.
Abstract: In this work, ultrathin amorphous Ge films (2 to 30 nm in thickness) embedded in SiO2 layers were grown by magnetron sputtering and employed as proficient light sensitizer in photodetector devices. A noteworthy modification of the visible photon absorption is evidenced due to quantum confinement effects which cause both a blueshift (from 0.8 to 1.8 eV) in the bandgap and an enhancement (up to three times) in the optical oscillator strength of confined carriers. The reported quantum confinement effects have been exploited to enhance light detection by Ge quantum wells, as demonstrated by photodetectors with an internal quantum efficiency of 70%.
30 citations
••
TL;DR: In this article, the optical properties of ZnO/ZnMgO multiple quantum well (MQW) structures with different well widths were reported, and they showed an efficient photogenerated carrier transfer from the barrier to the MQWs, which leads to an increased intensity ratio of the well to barrier emissions for the wider well width.
Abstract: We report the optical properties of ZnO/ZnMgO multiple quantum well (MQW) structures with different well widths grown on ZnO substrates by molecular beam epitaxy. Photoluminescence (PL) spectra show MQW emissions at 3.387 and 3.369 eV for the ZnO/ZnMgO MQW samples with well widths of 2 and 5 nm, respectively, due to the quantum confinement effect. Time-resolved PL results show an efficient photogenerated carrier transfer from the barrier to the MQWs, which leads to an increased intensity ratio of the well to barrier emissions for the ZnO/ZnMgO MQW sample with the wider well width.
30 citations
••
TL;DR: In this paper, the authors achieved electron transfer in a homojunction of branched rutile TiO2 nanorod by quantum confinement effect aroused by the nanoparticle, which is proved by the blue-shifting in UV-vis absorption spectrum of the homjunction.
30 citations
••
TL;DR: In this article, the formation mechanism of CZTS spherical quantum dots also has been investigated, according to the mechanism, copper sulfide nuclei firstly forms, and serves as the starting point for the nucleation and growth of cZTS.
30 citations