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The Kakalios group studies disorder systems, with projects running from neuroscience to semiconductor physics. The current focus of the Kakalios group is hydrogenated amorphous silicon (a-Si:H); in particular we examine the effects of the inclusion of silicon nanoparticles within the amorphous matrix, creating an interesting mixed phase material often abbreviated nc/a-Si:H. The use of nanoparticles was motivated by reports that the inclusion of nanoparticles leads to an enhanced resistance to the Staebler-Wronski effect (SWE); resistance to the SWE would be a major step in making thin film a-Si:H a viable candidate for solar cell production. The samples are prepared using a novel two chamber deposition system, which allows us to optimizatize both the nanoparticle and amorphous silicon growth conditions. We characterize the samples using a variety of methods, including:

Conductivity (both dark and photo-)
Noise Characteristics
Raman Spectroscopy
Constant Photocurrent Method (CPM)

Much of the work is done in collaboration with Dr. Kortshagen's group in the Mechanical Engineering Department.

Past projects include avalanche dynamics (sand) and examining neural activity in rats. Please refer to the publication list for further details on these past projects.

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Last Update: Nov. 16, 2008