We are proud to invite you to Skoltech Colloquium!
What: Dynamics of excitons and phonons at the nanoscale.
When: October 3; 4:00pm
Where: Kapitza Institute for Physical Problems;
2nd floor (Kosygina street, 2)
Guest Speaker: Sergei Tretiak, Theoretical Division, Center for Nonlinear Studies and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos New Mexico.
Abstract: Prediction and understanding of photoinduced processes in molecular- and nano-materials is fundamental to a myriad of technological applications, ranging from sensing, imaging, solar energy harvesting, to future optoelectronic devices. This talk will overview several applications of various quantum-chemical techniques to study excited state properties, dynamics and transport in organic molecular systems and semiconductor quantum dots. Our analysis shows intricate details of photoinduced vibronic relaxation and identifies the conformational degrees of freedom leading to ultrafast dynamics and energy transfer in conjugated polymers. Our modeling further demonstrate that chemical functionalization at low concentrations of single-walled carbon nanotubes locally alters the pi-conjugated network of the nanotube surface and leads to a spatial confinement of the electronically excited wave functions. This suggests that enhanced photo luminescent efficiency of semiconducting carbon nanotube materials can be achieved via selective chemical functionalization. Our studies of the surface ligands effects on the QDs electronic structure indicate strong surface-ligand interactions leading to formation of hybridized states. This potentially opens new relaxation channels for high energy photo excitations. Overall this theoretical modeling allows us to understand and to potentially manipulate energy transfer pathways in molecular and semiconductor nano-materials suitable for solar energy conversion.
Further Information:
For Students, Faculties and Postdocs transfer will be arranged.
From Skoltech to Kapitza Institute for Physical Problems bus at 15:10. Bus will wait for you near the Karacorum building (zero floor)
How to get to Kapitza Institute for Physical Problems:
Address: 2 ul. Kosygina Moscow (ул. Косыгина,2)
You can park in front of the Institute’s gates.
If you like to participate and for further information or questions, please Liliya Abaimova
We look forward to seeing you.
