Rs04exam1 - 1. A specimen of silicon has a donor...

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A specimen of silicon has a donor concentration of 5 x 10 15 cm -3 and an acceptor concentration of 2 x 10 15 cm -3 . What is the equilibrium hole concentration at 300K? 1. () () 3 - 4 3 - 15 2 3 - 10 0 2 0 3 - 15 15 15 0 2 0 cm 10 5 . 7 cm 10 3 cm 10 5 . 1 cm 10 3 10 2 10 5 × = × × = = × = × × = + = + + n n p N N N N n n n i a d a d i The diamond crystal structure has two interpenetrating lattices. Which type of cubic lattice forms each of the interpenetrating lattices? 2. Face Centered Cubic (FCC) Write D or A next to the following elements to indicate if they would be donor or acceptor atoms in a Si lattice. a) Boron A _ b) Phosphorous D _ c) Arsenic D _ d) Aluminum A _ e) Antimony D _ 3. The wavelength of a light source is 550 nm. What is the energy in eV of the light quanta emitted by this source? 4. () ( ) eV 2.26 J 10 62 . 3 m 10 550 m/s 10 3 Js 10 63 . 6 μ m) in ( eV 24 . 1 19 9 8 34 = × = × × × = = = = λ ν λ hc h E
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Rs04exam1 - 1. A specimen of silicon has a donor...

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