Electronic Devices

Give the ratio'of the number of holes and number
of conduction electrons in an intrinsic semiconductor.
[Foreign 2003]

Is the ratio of number of holes and number of
conduction electrons in a /'-type semiconductor
more than, less than or equal to 1 ?
[Foreign 2003]

How does the energy gap of an intrinsic semiconductor
vary, when doped with a trivalent
impurity ? [AI 2002

How does the width of the depletion region of
a p-n junction vary, if the reverse bias applied
to it decreases ? [AI 2002]

How does the width of the depletion region of
a p-n junction vary, if the reverse bias applied
to it increases ? [AI 2002

What is a solar cell ? How does it work ? Give
its one use. [AI 2002C]