Hi Lourassi,
It depends on the material used and the wavelength targeted! But to give you a ball park number, a 8 to 10nm thickness is usual for a QW, and barriers are usually >20nm to avoid coupling of the QWs (overlapping wavefunctions), but again it depends on the structure detail (number of wells, geometry,...).
Cheers,
Hi,
For interband-transition light-emitting devices the wells are 7.5-10 nm-thick and the barriers are typically 10 nm-thick. However, for intersubband-transitions devices, so -called quantum cascade lasers, the wells vary between 0.7 and 4 nm with the barriers varying between 1 and 4 nm. That's because in that case coupling between wells is necessary.
Alexandre is righr! It depens on the heterostructure. Usually it's up to some nm.
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