Silicon transport

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  • The facts of silicon (Si) in plant life are one thing; the concepts regarding Si in plant physiology are another thing altogether. Most terrestrial plants grow in media dominated by silicates, and the soil solution bathing roots contains Si at concentrations exceeding those of phosphorus (P) by roughly a factor of 100. Plants absorb the element, and their Si content is of the same order of magnitude as that of the macronutrient elements.

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  • Silicon technology continues to progress, but device scaling is rapidly taking the metal oxide semiconductor field-effect transistor (MOSFET) to its limit. When MOS technology was developed in the 1960's, channel lengths were about 10 micrometers, but researchers are now building transistors with channel lengths of less than 10 nanometers. New kinds of transistors and other devices are also being explored. Nanoscale MOSFET engineering continues, however, to be dominated by concepts and approaches originally developed to treat microscale devices...

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  • Most manufacturing technologies for metallic microstructures have their roots either in semiconductor (inmost cases, silicon) device production or in conventional precision machining. Of these, the techniques that are well known have been used formicrostructure dimensions. Further, they have been adapted and improved to reach the desired precision and surface quality. In some rare cases, itwas possible to use the same manufacturing process for macroscale and microscale devices and to get the desired results.

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  • Gardelis et al. Nanoscale Research Letters 2011, 6:227 http://www.nanoscalereslett.

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  • Diffusion is the transport of matter from one point to another by thermal motion of atoms or molecules. It is relatively fast in gases, slow in liquids, and very slow in solids. Diffusion plays a key rˆole in many processes as diverse as intermixing of gases and liquids, permeation of atoms or molecules through membranes, evaporation of liquids, drying of timber, doping silicon wafers to make semiconductor devices, and transport of thermal neutrons in nuclear power reactors.

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