Question

(b) The morphology of the InP film is dependent on the deposition rate and temperature as shown in the figure below. Explain what the terms 'Deposition Rate' and 'Temperature' refer to and describe how they determine the three growth processes identified in the figure below. [3] Deposition Rate Multilayer 3D growth Layer-by-Layer 2D growth Temperature Step-flow growth (c) The structure of the InP/Si(100) material can be examined using X-ray diffraction. InP crystallises in the zinc-blende structure which consists of two interpenetrating $fcc$ lattices one of In atoms and one of P atoms (the two lattices are displaced to each other by a quarter of the body diagonal of the cubic cell). Calculate the general form of the structure factor in the case of an $fcc$ lattice and hence, or otherwise, calculate the structure factor of the (2, 0, 0) Bragg reflection for InP in terms of the atomic form factors $f_{In}$ and $f_P$. Show all of your working. [5]

          (b) The morphology of the InP film is dependent on the deposition rate and temperature as shown
in the figure below. Explain what the terms 'Deposition Rate' and 'Temperature' refer to and
describe how they determine the three growth processes identified in the figure below.
[3]
Deposition Rate
Multilayer
3D growth
Layer-by-Layer
2D growth
Temperature
Step-flow
growth
(c) The structure of the InP/Si(100) material can be examined using X-ray diffraction. InP
crystallises in the zinc-blende structure which consists of two interpenetrating $fcc$ lattices one of In
atoms and one of P atoms (the two lattices are displaced to each other by a quarter of the body
diagonal of the cubic cell). Calculate the general form of the structure factor in the case of an $fcc$
lattice and hence, or otherwise, calculate the structure factor of the (2, 0, 0) Bragg reflection for InP
in terms of the atomic form factors $f_{In}$ and $f_P$. Show all of your working.
[5]

$(b) The morphology of the InP film is dependent on the deposition rate and temperature as shown in the figure below. Explain what the terms 'Deposition Rate' and 'Temperature' refer to and describe how they determine the three growth processes identified in the figure below. [3] Deposition Rate Multilayer 3D growth Layer-by-Layer 2D growth Temperature Step-flow growth (c) The structure of the InP/Si(100) material can be examined using X-ray diffraction. InP crystallises in the zinc-blende structure which consists of two interpenetrating fcc lattices one of In atoms and one of P atoms (the two lattices are displaced to each other by a quarter of the body diagonal of the cubic cell). Calculate the general form of the structure factor in the case of an fcc lattice and hence, or otherwise, calculate the structure factor of the (2, 0, 0) Bragg reflection for InP in terms of the atomic form factors fIn and fP. Show all of your working. [5]$

Added by Richard C.

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