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Applet Tutorial

The Stop button, the process stops.

The Start button initiates a new process.

The Pause/Resume button temporarily halts the process
so that the data can be recorded or a momentary snap shot of the process
can be examined.

The three checkboxes, width vs. t, displcmnt
vs. t, N vs. t, display the data for the width
of concentration profile, the displacement of the peak from its initial
position, and the total number of excess minority carriers, respectively,
as a function of time for the first 100 microseconds.
Check in the applet the checkboxes of

width vs. t,

displcmnt. vs. t, and

N vs. t

Diffusion

Set lifetime to infinity, bias to 0 V and material to ptype.
===> Start the applet,
and observe the minority carriers.

Set lifetime to infinity, bias to 0 V, material to ntype.
===> Start the applet, and observe
the minority carriers.

Set lifetime to infinity, bias to 0 V, mobility to 3900 cm2/VS.
===> Start and observe.

Drift

Set lifetime to infinity, bias to +2V, material to ptype.
===> Start the applet, and observe !

Set lifetime to infinity, bias to +1V, material to ntype.
===> Start the applet and observe !

Set lifetime to infinity, bias to 2V, material to ntype.
===> Start the applet and observe !

Set lifetime to infinity, bias to 1V, material to ptype.
===> Start the applet and observe.

Recombination

Set lifetime to 1ms and bias to +0V.

Set lifetime to 0.1ms and bias to +0V.

Set lifetime to 0.01ms and bias to +0V.
Note: Since the minority carrier lifetimes are long in
Ge, as compared to Si or GaAs, the example is given for Ge. You can change
the conduction type, bias value, length of the sample, temperature, lifetime,
and mobility (of minority carrier) using the bottom panel and examine their
effects on the excess minority carrier processes.

A 'virtual laboratory' worksheet for
this applet, created by Prof. Jennifer Ross of Univ. of Pacific, is available
in pdf format. Print the form out and complete it while working with the
applet. (C.Wie, 2/17/1999)