University of Minnesota
School of Physics & Astronomy

Condensed Matter Sack Lunch Seminar

Tuesday, October 27th 2009
12:20 pm:
Speaker: Lee Wienkes, University of Minnesota
Subject: Hopping Transport in Amorphous Silicon

During the 1970’s, it was discovered that adding hydrogen to amorphous silicon (a-Si), producing hydrogenated amorphous silicon (a-Si:H), drastically reduced the density of defect states, resulting in an improved material. This opened the door for many discoveries with important technological applications, including the observation of doping, previously thought to be impossible in amorphous semiconductors. Following this revolution in the field, unhydrogenated amorphous silicon (a-Si) was largely left behind despite unsolved questions concerning the transport mechanisms in the material. These questions cover both conductivity and the thermoelectric power. Our group isrevisiting these questions and will present a brief overview of the current knowledge, as well as some new research on unhydrogenated amorphous silicon.

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