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VERSION:2.0
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CALSCALE:GREGORIAN
X-WR-CALNAME:Physics Colloquium with Dr. Rene Lopez
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260814T160132Z
UID:tag:localist.com\,2008:EventInstance_44631749448649
DTSTART:20231026T200000Z
DTEND:20231026T210000Z
DESCRIPTION:Rene Lopez from the University of North Carolina at Chapel Hill
  will be presenting at this week's Physics Colloquium. The seminar will be
  presented in person at 4 PM\, Thursday\, October 26 in Fisher 139.\n\n \n
 \nABSTRACT:\n\nEfficient absorption of photons and effective charge carrie
 r extraction are the key properties that enable good performance in a phot
 ovoltaic cell. These two functions depend primarily on material-intensive 
 properties such as optical constants\, band alignments\, defects\, and cha
 rge mobilities and lifetimes. Morphology and geometrical factors at a larg
 e range of length scales are nevertheless decisive\, as light absorption a
 nd carrier extraction are frequently found to present their best performan
 ces at opposite ends of geometrical variables.\n\nPulsed laser deposition 
 (PLD) is a physical thin film growing technique that enables the variation
  of morphology\, from compact layers to nanoparticle aggregates\, with the
  continuous degree of structural connectedness and tunability of the elect
 rical charge transport quality. Combined with controlled seeding/patternin
 g of the substrate\, geometrical control can be tailored at a larger scale
  to affect optical absorption and potentially their mechanical properties.
 \n\nIn particular\, we have developed a high surface area oxide fabricatio
 n that offers a tree-like hierarchical arrangement of nanoparticles that p
 reserves a high surface area while building direct highways to transport t
 he charges toward the bottom contacts for sensitized solar cell configurat
 ions. Simple patterning allows for enhancements in their photon-to-electro
 n conversion efficiency.\n\nWe will also describe potential and in-progres
 s electro-photonic enhancements utilizing these structural modification ap
 proaches to quantum dot photovoltaic systems and also the flexibility of t
 he supporting transparent conductive substrates when designed under this g
 eometrical strategy.\n\n \n\nBIO:\n\nProf. Rene Lopez obtained his Bachelo
 r's degree from the Monterrey Institute of Technology (Mexico) and his Mas
 ter's and Doctoral degrees from Vanderbilt University (USA). He worked at 
 the Oak Ridge National Laboratory and Vanderbilt University before joining
  the University of North Carolina Faculty at Chapel Hill (UNC) in 2006. He
  currently heads a group at UNC that performs research in optical material
 s and microstructures for photovoltaics\, artificial photosynthesis\, and 
 3D printing technologies.
LOCATION:Fisher Hall\, 139
SUMMARY:Physics Colloquium with Dr. Rene Lopez
URL;VALUE=URI:https://events.mtu.edu/event/physics_colloquium_with_dr_rene_
 lopez
CATEGORIES:Academics
CATEGORIES:Lectures/Seminars
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