What kinds of excitation mechanism can cause an e- to make a transition from the top...

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What kinds of excitation mechanism can cause an e- to make a transition from the top of the valance band (VB) to the minimum or bottom of the conduction band (CB)? Draw a band structure to illustrate the transition. For silicon at a given temperature of 300 K, state each transition mechanism and calculate thermal energy. If the excitation is made by an electric field, calculate the field strength of the electric field. Calculate the wavelength of photons needed to promote e- from VB to CB. (10 points) What kinds of excitation mechanism can cause an e- to make a transition from the top of the valance band (VB) to the minimum or bottom of the conduction band (CB)? Draw a band structure to illustrate the transition. For silicon at a given temperature of 300 K, state each transition mechanism and calculate thermal energy. If the excitation is made by an electric field, calculate the field strength of the electric field. Calculate the wavelength of photons needed to promote e- from VB to CB. (10 points)