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DTSTART:20200329T030000
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DTSTART:20191027T020000
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DTSTAMP:20260409T121548Z
UID:5e1f061e4c203963657785@ist.ac.at
DTSTART:20200206T110000
DTEND:20200206T130000
DESCRIPTION:Speaker: Maksym Yarema\nhosted by Maria Ibanez\nAbstract: Chalc
 ogenide semiconductors comprise an important class of materials with a ple
 thora of uses in photovoltaic\, thermoelectric\, catalytic\, phase-change 
 memory and other applications. Likewise\, colloidal chalcogenide nanocryst
 als retain the first place as material sets for fundamental and use-inspir
 ed research. In this talk\, I will summarize our recent work\, regarding c
 olloidal selenide and telluride nanomaterials. Traditionally\, the propert
 ies and performance of nanocrystals are tuned by accurate control over the
 ir size\, stemming from quantum confinement phenomena. Multicomponent nano
 crystals provide an extra tuning knob: composition-dependent effects are s
 uperimposed on size dependences. Synthesis of multicomponent nanocrystals\
 , however\, remains a synthetic challenge\, due to side reactions and diff
 erence in reactivity of starting precursors. Taking examples of ternary an
 d quaternary chalcogenide nanocrystals (Ag-In-Se\, Cu-Zn-In-Se\, etc.)\, I
  will highlight an amide-promoted synthetic approach that enables independ
 ent control over nanocrystal size and composition. This allows us to separ
 ate the composition and size effects as well as detect optimal ternary and
  quaternary compositions\, which exhibit enhanced luminescence efficiencie
 s. Structure of colloidal nanocrystals provides yet another way of tuning 
 their properties and performance. In this part of the talk\, I will focus 
 on GeTe nanoparticles\,particularly on reliable size-controlled synthesis 
 of colloidal phase change materials and determination and understanding of
  size-dependent crystallization temperature. Finally\, we will discuss the
  influence of size-dependent phase transitions on phase-change properties\
 , which stems from physical nanodimensions of GeTe colloids.
LOCATION:Heinzel Seminar Room / Office Bldg West (I21.EG.101)\, ISTA
ORGANIZER:slandaue@ist.ac.at
SUMMARY:Maksym Yarema: Tailor-Made Chalcogenide Colloids: Tuning Size\, Com
 position\, and Structure of Nanomaterials
URL:https://talks-calendar.ista.ac.at/events/2500
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