The laboratory work N^o 41.

Defining of the width of the band gap of the semiconductor and temperature coefficient of the metal’s resistance.

Had done by the student gr.__220171я__ F.N.S. Pavlov F.E.

Checked by ______________________ date ____________

Purpose: research the dependence of the semiconductor and metal from the temperature, define the width of the semiconductor’s band gap and temperature coefficient of the metal’s resistance.

The order of performing a work:

Write the results of measurements to the Table1.

Table1.

Semiconductor		Metal
t, 0C	Rs, Ohm	t, 0C	Rm, Ohm
28	230	28	13
36	190	36	16
44	140	44	17
52	123	52	17
60	104	60	18
68	98	68	19

Construct plots of dependence of the semiconductor’s and metal’s resistance from the temperature.

Define the resistance of the metal R₀ at the temperature t = 0⁰ C and temperature coefficient of the metal  , using the following formula and plot R_m = f(t).

Table2.

T, K	1/T, K-1	lg Rs

Construct a plot of lgR_n = f(1/T).

Where k = 1.38*10^-23J*K^-1 = 1.38*10^-23/(1.6*10^-19)eV*K^-1,

lnR = 2.3lgR.

,

eV.

Using the plot and formula to define a width of the band gap E₃.

Conclusion: so we have researched the dependence of the semiconductor and metal from the temperature, define the width of the semiconductor’s band gap and temperature coefficient of the metal’s resistance.