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Lab 1.doc - Purpose The purpose of this lab is to...

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Purpose: The purpose of this lab is to demonstrate the change in conductivity of a semiconductor in response to temperature. It is also demonstrates how this data can be used to measure E gap . Theory: The conductivity of a semiconductor material is given by σ=L/RA, where L is the length of the semiconductor, R is the resistance of the semiconductor and A is the area of the cross section of the semiconductor. We also know that the properties of a semiconductor vary with the change of temperature and that these formulas are related with that change: σ n = qN d µ e at room temperature, σ = q (µ e + µ h ) AT 3/2 e -Eg/kT at high temperature, and σ=(constant)xT 3/2 e -Ed/2kT at low temperature. Procedure: A Germanium Semiconductor bar with a length of 1.5 cm and a cross section of 3 mm x 3 mm was place in a temperature chamber and the leads were attached to a digital multimeter. The temperature was then reduced to -70°C and the temperature was slowly raised to 200°C. The resistance was measured every 10°C using the multimeter. The conductivity was then calculated for each reading
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