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SUMMARY:*Talk Cancelled* Spins at Work in Energy Conversion and Storage De
 vices - *Talk Cancelled* Prof. Dr. Jan Behrends - Freie Universitaet Berli
 n
DTSTART:20220322T150000Z
DTEND:20220322T160000Z
UID:TALK171809@talks.cam.ac.uk
CONTACT:Amita Ummadisingu
DESCRIPTION:Unpaired electron spins are unique local probes for elucidatin
 g photocurrent generation in organic\nsolar cells as well as redox reactio
 ns in polymer batteries. Electron Paramagnetic Resonance (EPR)\nspectrosco
 py can thus be employed to analyse these processes\, identify loss mechani
 sms\, and\neventually help developing strategies for improving the perform
 ance of devices for energy\nconversion and energy storage.\nThe first part
  of this presentation will give an overview about how EPR-based techniques
  in\ncombination with optical excitation can usefully complement all -opti
 cal experiments in studying\ncharge separation in materials for solar cell
 s based on organic semiconductors. As one example\, I\nwill discuss the EP
 R properties of intermediate paramagnetic states generated upon fission of
  one\nsinglet exciton into two separated triplet excitons. This singlet fi
 ssion process provides the\npossibility of building solar cells with quant
 um efficiencies exceeding 100 %.\nThe second part of the talk will address
  the role of electron spins in charging and discharging of\norganic radica
 l batteries (ORBs). In particular\, I will report on the development of a 
 versatile on-\nsubstrate electrode setup for spectroelectrochemical EPR me
 asurements on redox conductive\npolymers for ORBs. This setup was recently
  used to perform quantitative in- operando EPR\nexperiments on electrochem
 ical cells with a novel nitroxide-containing polymer as active electrode m
 aterial.
LOCATION:Talk Cancelled
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