Condensed-Matter Physics & Materials Science Seminar

"Charge Transport in Lead Selenide Nanocrystal Arrays"

Presented by Tamar Mentzel, Harvard/ MIT

Friday, May 29, 2009, 11:00 am — Bldg. 480 conference room

Lead selenide(PbSe) nanocrystal (NC) quantum dots have garnered much attention for their possible application in solar cells. However, one of the factors which would limit the efficiency of PbSe NC solar cells is the trapping of charge carriers in localized states. To better understand the transport of charge through NCs and through localized sites in general, we study the electronic properties of arrays of PbSe NCs. With the NCs as the active region of an inverted field effect transistor, we measure the dependence of the current on source-drain voltage, gate voltage and temperature. To probe the charge transport more directly, we fabricate a narrow channel silicon MOSFET which is sensitive to the charge of a single electron in its environment. We demonstrate that this charge sensor detects single electron hopping events and senses the charging of a film of amorphous germanium.

Hosted by: Ivan Bozovic

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