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Hall and field-effect surface mobility has been measured in polycrystalline ~Im~ of CdS of thi~~ness 1000--4000 A. At low surface potential, the mobility increases with surface potential. fhe Hall moblht?' was ?bserved to increase exponentially with temperature from -80° to 120°C. These effects can be explamed usmg a polycrystalline film model. The effects of diffuse surface scattering were not o?served at low surface potential due to the small mean free path of electrons. However, when the channel thickness was comparable to the electron mean free path a decrease in mobility was observed.

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Our visual system provides our principal contact with the world around us. This system, thanks to millions of years of natural development, achieved a high degree of perfection long before humans arrived on the scene. To attain such perfection, these evolutionary processes had to recognize the quantum nature of light—a remarkable accomplishment.