b. What is the expression for the minimum conductivity?
c. Is this value greatly different than the value calculated for intrinsic silicon at room temperature?
When a Au atopm sits on a liattice site in a silicon crystal, it can act as either a donor or an acceptor. ED and EA levels both exist for the Au and both are close to the middle of the Si bandgap. If a small concentration of Au is placed in an N-type silicon crystal, will the Au behave as a donor or an acceptor? Explain.
A silicon diode has doping concentrations on the N and P sides of ND = 1 x 1019 cm-3 and NA = 1 x 1015 cm-3. Calculate the process temperature at which each of the two sides of the diode becomes intrinsic. (Intrinsic is defined as ni = ND or NA)