TY  - JOUR
AU  - Roth, Friedrich
AU  - Borgwardt, Mario
AU  - Wenthaus, Lukas
AU  - Mahl, Johannes
AU  - Palutke, Steffen
AU  - Brenner, Günter
AU  - Mercurio, Giuseppe
AU  - Molodtsov, Serguei
AU  - Wurth, Wilfried
AU  - Gessner, Oliver
AU  - Eberhardt, Wolfgang
TI  - Direct observation of charge separation in an organic light harvesting system by femtosecond time-resolved XPS
JO  - Nature Communications
VL  - 12
IS  - 1
SN  - 2041-1723
CY  - [London]
PB  - Nature Publishing Group UK
M1  - PUBDB-2021-00696
SP  - 1196 (1-7)
PY  - 2021
AB  - The ultrafast dynamics of photon-to-charge conversion in an organic light-harvesting system is studied by femtosecond time-resolved X-ray photoemission spectroscopy (TR-XPS) at the free-electron laser FLASH. This novel experimental technique provides site-specific information about charge separation and enables the monitoring of free charge carrier generation dynamics on their natural timescale, here applied to the model donor-acceptor system CuPc:C<sub>60</sub>. A previously unobserved channel for exciton dissociation into mobile charge carriers is identified, providing the first direct, real-time characterization of the timescale and efficiency of charge generation from low-energy charge-transfer states in an organic heterojunction. The findings give strong support to the emerging realization that charge separation even from energetically disfavored excitonic states is contributing significantly, indicating new options for light harvesting in organic heterojunctions.
LB  - PUB:(DE-HGF)16
C6  - pmid:33608532
UR  - <Go to ISI:>//WOS:000621496400004
DO  - DOI:10.1038/s41467-021-21454-3
UR  - https://bib-pubdb1.desy.de/record/454732
ER  -