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The Deal-Grove model also fails for polycrystalline silicon ("poly-silicon"). First, the random orientation of the crystal grains makes it difficult to choose a value for the linear rate constant. Second, oxidant molecules diffuse rapidly along grain boundaries, so that poly-silicon oxidizes more rapidly than single-crystal silicon. [citation ...
The diffusion equation is a parabolic partial differential equation. In physics, it describes the macroscopic behavior of many micro-particles in Brownian motion , resulting from the random movements and collisions of the particles (see Fick's laws of diffusion ).
Diffusion current is a current in a semiconductor caused by the diffusion of charge carriers (electrons and/or electron holes). This is the current which is due to the transport of charges occurring because of non-uniform concentration of charged particles in a semiconductor.
Example 1 shows one broad maximum in the n(λ) and k(λ) spectra of the a-Si film, as is expected for amorphous materials. As a material transitions toward crystallinity, the broad maximum gives way to several sharper peaks in its n(λ) and k(λ) spectra, as demonstrated in the graphics.
The track is characterised by its 1.8 km (1.1 mi) long Mistral straight and elongated track design. The track is also unusual in that it is built on a plateau : it is very flat. In 1986 the track was modified to shorten the circuit, by adding shortcut through to the middle of the Mistral Straight.
The exact reverse of radiative recombination is light absorption. For the same reason as above, light with a photon energy close to the band gap can penetrate much farther before being absorbed in an indirect band gap material than a direct band gap one (at least insofar as the light absorption is due to exciting electrons across the band gap).
[1] Russian Formula One commentator Alexey Popov coined the term "Tilkedrome" to emphasize the characteristic ennui of tracks designed by Tilke. [ 2 ] Former driver and team owner Jackie Stewart was critical of Tilke in a 2011 piece in The Daily Telegraph , blaming his designs for the lack of overtaking and excitement at many Formula One races ...
Poroelasticity is a field in materials science and mechanics that studies the interaction between fluid flow, pressure and bulk solid deformation within a linear porous medium and it is an extension of elasticity and porous medium flow (diffusion equation). [1] The deformation of the medium influences the flow of the fluid and vice versa.