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SUMMARY:Anharmonic Lattice Dynamics in Organic Semiconductors - Omer Yaffe
DTSTART:20210504T123000Z
DTEND:20210504T133000Z
UID:TALK159823@talks.cam.ac.uk
CONTACT:Mengxia Liu
DESCRIPTION:What is the relation between the structural dynamics of crysta
 ls and their functional properties at finite temperatures? Recent studies 
 of halide perovskite semiconductors showed that despite being mechanically
  soft and having many structural defects\, they have excellent optoelectro
 nic properties. We and others have shown that a key fundamental property f
 or their surprising optoelectronic properties is their strongly\nanharmoni
 c (i.e.\, nonlinear) lattice dynamics. Inspired by these findings\, we tur
 ned to investigate anharmonic effects in the lattice dynamics of organic s
 emiconducting\ncrystals that are even softer\, mechanically\, than the hal
 ide perovskites.\nI will present Raman scattering studies that show a plet
 hora of expressions of anharmonicity in the structural dynamics of organic
  crystals. Then\, I will discuss how the character of the structural dynam
 ics can be tuned by introduction of molecular sidechains. Finally\, I will
  discuss implications of the anharmonic lattice dynamics on the electronic
  properties of these crystals.
LOCATION:https://zoom.us/j/96904896974?pwd=aWY2K0ZkVmFldXBBWC9OUDlRZXFnUT0
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