Potential well

About: Potential well is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 30812 citations.

Quantum Dots as a Light Indicator for Emitting Diodes and Biological Coding

Abstract: Quantum dots (QDs) are inorganic semiconductor particles that exhibit size and shape dependent optical and electronic properties (Alivisatos, 1996; Smith & Nie, 2010). Due to the typical dimension in the range of 1-100 nm, the surface-to-volume ratios of the materials become large and their electronic states become discrete. Moreover, due to the fact that the size of the semiconductor nanocrystal is smaller than the size of the exciton, charge carriers become spatially confined, which raises their energy (quantum confinement). Thus, the size and shape-dependent optoelectronic properties are attributed to the quantum confinement effect. Because of this effect, light emission from these particles can be tuned, throughout the ultraviolet, visible and near infrared spectral ranges.

Strong and robust polarization anisotropy of site- and size-controlled single InGaN/GaN quantum wires.

Abstract: Optical polarization is an indispensable component in photonic applications, the orthogonality of which extends the degree of freedom of information, and strongly polarized and highly efficient small-size emitters are essential for compact polarization-based devices. We propose a group III-nitride quantum wire for a highly-efficient, strongly-polarized emitter, the polarization anisotropy of which stems solely from its one-dimensionality. We fabricated a site-selective and size-controlled single quantum wire using the geometrical shape of a three-dimensional structure under a self-limited growth mechanism. We present a strong and robust optical polarization anisotropy at room temperature emerging from a group III-nitride single quantum wire. Based on polarization-resolved spectroscopy and strain-included 6-band k·p calculations, the strong anisotropy is mainly attributed to the anisotropic strain distribution caused by the one-dimensionality, and its robustness to temperature is associated with an asymmetric quantum confinement effect.

Raman photoluminescence spectra of silicon nanowires synthesized by a vapor phase transport method

Abstract: Silicon nanowires were successfully synthesized by a thermal evaporation method. We have observed a strong and broad emission band centered at 670?nm, which is attributed to the quantum confinement effect related to Si nanostructures embedded in the complex SiOx matrix. By fitting an experimental Raman spectrum, we confirm that the as-received wires possess crystalline silicon cores whose sizes were around 5?nm. Furthermore, the abnormal dependence of integral photoluminescence intensity on measured temperature was investigated.

Optical Spectroscopy of Size Effects in Semiconductor Microcrystals

Abstract: Size effects in semiconductor systems with reduced dimensions have attracted considerable attention within the last few years. Besides the well known quantum-well and quantum-wire structures(1,2), semiconductor microcrystals prepared in aqueous and gaseous media were investigated(3,4). The purpose of this paper is to investigate the quantum confinement effects in semiconductor microcrystals grown in an optically transparent matrix of oxide glass. The preparation technique developed makes it possible to vary the size of microcrystals in a controlled manner from a few tens to thousands of angstroms(5).