Recent content by espen-4

Neither equation relates the band gap to the refractive index. So, the logic ypu are seeking cannot be found from these equations alone. A quick google search resulted in finding this paper that shows how complicated this relationship is: https://web.njit.edu/~sirenko/PapersNJIT/Ravi_IPT_2007.pdf.

According to this site (nice figures there): https://www.nde-ed.org/EducationResources/CommunityCollege/Materials/Structure/solidification.htm grains form for the following reason: When the material goes from a liquid to a solid there are many nucleation points each forming a grain. They then...

From Brittanica.com: "Metals are usually crystalline solids. In most cases, they have a relatively simple crystal structure distinguished by a close packing of atoms and a high degree of symmetry." But a chunk of metal consists of many grains (within which there is crystalline order). Across...

I do not know the typical height, but I think a height of 100 meV should be sufficient for a device operating at room temperature. For lower temperatures an even lower step height would be sufficient in order to trap the carriers in the low gap material. You also need to look at how the band...

If the electron concentration (n) is significantly higher than the hole concentration (p) (say 100 times higher) then you can use the approximation RH=-1/(ne). To determine whether this approximation is ok to use you must calculate the hole concentration p=ni^2/n. Where ni is the intrinsic...

To be sure that a carrier does not cross a barrier you have to design the step to be high enough so that the probability of the carrier crossing the barrier is close to zero. The probability of a carrier crossing a step goes as exp(-E/kT) where E is the energy step across the barrier, T is the...