Which process involves dipping a seed crystal into a molten silicon liquid and pulling it upwards at a specific rotational speed?
A. Multicrystalline ingot casting
B. Float-zone pulling
Czochralski casting
D. Silicon wire casting
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Which of the following processes is used in order to fabricate monocrystalline silicon?Note that more than one correct answer is possible.
A. The Czochralski process
B. Fluid bed reactor process
C. The float-zone process
D. The Siemens process
What is the proper order, from lower purity to higher purity, of the following types of silicon?
A. Metallurgical silicon / monocrystalline silicon / polysilicon
B. Monocrystalline silicon / polysilicon / metallurgical silicon
C. Metallurgical silicon / polysilicon / monocrystalline silicon
D. Polysilicon / metallurgical silicon / monocrystalline silicon
Which of the following statements is true about monocrystalline and multicrystalline silicon?
A. SRH recombinations are more important in multicrystalline than in monocrystalline silicon.
B. Higher open-circuit voltages are obtained with multicrystalline than with monocrystalline silicon.
C. The open-circuit voltage increases as the grain size of the multicrystalline silicon absorber layer decreases.
D. The lifetime of minority charge carriers is higher in multicrystalline than in monocrystalline silicon.
We have discussed that indirect band gap materials have a lower absorption coefficient than direct band gap materials, due to the fact that the charge carriers need a change in energy AND momentum in order to be excited. If both Si and Ge are indirect band gap materials, why does Ge have a much higher absorption coefficient than Si in the visible wavelength range?
A. Because Ge has more valence electrons than Si.
Because Ge has a higher band gap than Si.
C. Because Si has direct transitions in this part of the spectrum.
D. Because Ge has direct transitions in this part of the spectrum.
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