Q1. The band structure of Indium Phosphide (InP) is illustrated below showing the conduction and valence bands. Energy 3

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Q1 The Band Structure Of Indium Phosphide Inp Is Illustrated Below Showing The Conduction And Valence Bands Energy 3 1 (50.68 KiB) Viewed 70 times

(a) Using the illustration, identify:
i. The band gap type and associated band gap energy.
ii. Is this material an efficient light emitter and why?
iii. Calculate the wavelength above which the material becomes
transparent. [4 marks]
(b) Where is the effective mass for electrons the largest, in
point A or C? Explain your answer. [3 marks] (c) Is the velocity of
an electron at point D positive, zero or negative? Explain your
answer. [3 marks]
(d) Compare the density of states in energy, D(E), at points A
and C. Which one is larger? Explain why. [3 marks]
(e) Draw the energy band diagram and the Fermi energy for
Germanium with and without an applied electric field in the
following cases:
• Doped with Arsenic at a concentration of 1E18 cm-3
• Doped with Boron at concentration of 1E16 cm-3
• Doped uniformly with Arsenic at a concentration of 1E18 cm-3 and
Boron at concentration of 5E17 [7 marks]
Q1. The band structure of Indium Phosphide (InP) is illustrated below showing the conduction and valence bands. Energy 300 K X-valley Ę=1.34 eV +=1.93 eV Ex=2. 19 eV E=0.11 eV -valley D L-valley InP EX A E. E <100> B <111> Wave vector Heavy holes Light holes E. Split-off band