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DTSTART:20260329T030000
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DTSTAMP:20260424T143233Z
UID:68761a72d3b38683755680@ist.ac.at
DTSTART:20260226T103000
DTEND:20260226T121500
DESCRIPTION:Speaker: James Utterback\nhosted by Maria Ibáñez\nAbstrac
 t: The functionalities of photoactive materials ranging from optoelectroni
 cs\, plasmonics\, catalysis and phase-switching applications require not o
 nly control over the photoexcited charges but also heat generation\, trans
 port and dissipation. The transport of energy carriers at microscopic leng
 th scales underlies the efficiency of such applications. Yet\, in many mat
 erial systems\, energy carrier transport must navigate heterogeneities of 
 various natures over a broad range of length and time scales. Moreover\, r
 eal device conditions may feature contact with other material layers\, bia
 s\, and nonequilibrium conditions that cause deviations from pure material
  behavior. There are many approaches to inferring microscopic energy trans
 port through energetic\, temporal\, or spatial markers\, but each faces li
 mitations. Moreover\, heterogeneous systems are often elusive to simple mo
 dels that reveal fundamental transport parameters. To understand the princ
 iples that govern electronic and thermal carrier dynamics in complex syste
 ms\, advanced experimental techniques and models are needed. In this prese
 ntation I will describe how pumpprobe optical measurements and modeling of
  energy carrier transport provide access to nanosecond dynamic information
  with local\, sub-micron specificity. I will highlight examples including 
 colloidal nanocrystal assemblies\, photoelectrodes for water oxidation\, a
 nd insulator-to-metal phase transition thin films. This presentation will 
 focus on the following questions: How do nanoscale and mesoscale structure
  and defects impact microscopic energy transport? How can we access inform
 ation about energy carriers such as heat that are not traditionally probed
  by spectroscopy? How can we control the directionality of energy carrier 
 flow? How can we access carrier transport under more realistic device cond
 itions?
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:hcai@ist.ac.at
SUMMARY:James Utterback: Spatiotemporal Microscopy of Energy Carrier Transp
 ort: from Nanomaterials to Photoelectrodes and Phase-Change Materials
URL:https://talks-calendar.ista.ac.at/events/5921
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