At T=300K, the electron concentration of a semiconductor material is n, =10° cm³. The bandgap energy E=1.leV, N. = 2.8×10'º cm³, and N¸ =1.0×10º cm³ (1) Determine the hole concentration P,. Is this n-type or p-type semiconductor? (2) Determine the position of the Fermi level with respect to the intrinsic Fermi level, i.e., E, - E,. -3

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).