An n-type Si semiconductor containing 10° phosphorus (donor) atoms cm-3 has been doped with 1017 boron (acceptor) atoms cm³. Calculate the electron and hole concentrations in this semiconductor.

Consider silicon at T =300 k is doped with donor impurities No = 2.8 × 101⁹ atoms / cm3 and Nc -2.8×101⁹ cm-³ 1. Draw the energy band diagram for this semiconductor and label all the energy levels? 2. What is the type of semiconductor?

In an extrinsic semiconductor, both n type and p type impurities are mixed. If 1.5x1010/cm3 is the intrinsic carrier concentration and 2.25x1016/cm3 is the concentration of p type impurities mixed, then what will be concentration of n type impurities?

Suppose a semiconductor has ND=1016/cm3and ni =1010/cm3. What are the equilibrium electron and hole concentrations?

Determine the negative resistance for the tunnel diode in the figure between ?T = 0.2 ? and ?T = 0.4

This about PN Junctions of semiconductors.

Consider four of semiconductor samples: solid A is orange, solid B is black, solid C is white, and solid D is yellow. Given their colors, rank these semiconductors in order of increasing band gap. A. B < A < D < c B. B < D < A < C C. C < D < A < B D. C < A < D < B

A doped semiconductor is also known as a. Extrinsic semiconductor b. Intrinsic semiconductor c. Diffused semiconductor d. None of the above

4.) In which mode will a diode generally not conduct electricity? a. Bidirectional Biased b. None of these c. Forward Biased d. Reversed Biased   5.) Consider the following schematic symbol of a semiconductor device: Which side is the Cathode? (Picture inserted down below) a. Side A b. Both side A and B c. Side B d. Neither side A or B   8.) Integrated circuits can be broken down into three basic categories.  Which category does an operational amplifier (or op-amp) fall into? a. Analog b. None of these c. A combination of analog and digital d. Digital

1. After the temperature rises, in the pure semiconductor ( ) A. The number of free electrons and holes increases with the same increment B. More holes, same number of free electrons C. Free electrons increase, holes remain unchanged D. The number of free electrons and holes remains unchanged