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SUMMARY:Amorphous semiconductors - a good random network is hard to get - 
 Professor Murray Gibson\, North Eastern University USA
DTSTART:20110304T160000Z
DTEND:20110304T170000Z
UID:TALK29959@talks.cam.ac.uk
CONTACT:Prof. A Howie
DESCRIPTION:The continuous random network model\, which is likely a good d
 escription of vitreous glasses\, does not well fit the as-grown structure 
 of most amorphous silicon and germanium. Instead it appears that the degre
 e of topological crystallinity exceeds 50% in many samples. Although the r
 andom network structure is probably more energetically favorable\, ubiquit
 ous high density crystalline nucleation is likely the cause of the high en
 ergy "paracrystalline" structure which we observe.\n\nCoherent electron di
 ffraction measurements were made of intensity fluctuation in nanodiffracti
 on patterns\, including angular intensity correlations. Development of the
 se "fluctuation microscopy" techniques will be discussed\, along with thei
 r application to other materials.\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory
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