Electrical Properties of Metals and Semiconductors Lab

Electrical Properties of Metals and Semiconductors Lab -...

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Experiment #3: Electrical Properties of Metals and Semiconductors Materials Science 104 Discussion 2A Introduction Thermal vibration of the lattice and lattice irregularities often alter carrier transportation because
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they scatter electrons. With this reasoning, the resistance of a material increases as the temperature is increased. Conductivity in semiconductors is often determined by the ability of a carrier to overcome a band gap. In particular, for n-type semiconductors, the carrier electrons are a result of the extrinsic excitation-electron transitions from the donor levels to the conduction band. As the temperature increases, materials are able to get more thermal energy and therefore, the electrons can be excited from the valence band to the conduction band and therefore reduce the resistance of the material. Objective The purpose of this experiment is to show how the change in temperature affects the resistance in metals and semiconductors. Experimental Procedures We first created a device using platinum, a copper conductor, and MOSFET and connected it to multimeters. We then put this device into ice water, room temperature water, and hot water and measured the electrical resistance of the device at these temperatures. We used the platinum as the measurement standard. Results
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This note was uploaded on 05/08/2008 for the course MATSCI 104 taught by Professor Lan during the Spring '08 term at UCLA.

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Electrical Properties of Metals and Semiconductors Lab -...

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