English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Photoexcited organic molecules en route to highly efficient autoionization

Vempati, S. P. K., Bogner, L., Richter, C., Deinert, J.-C., Foglia, L., Gierster, L., et al. (2020). Photoexcited organic molecules en route to highly efficient autoionization. The Journal of Chemical Physics, 152(7): 074715. doi:10.1063/1.5136075.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
1911.04333.pdf (Preprint), 535KB
Name:
1911.04333.pdf
Description:
File downloaded from arXiv at 2019-11-21 10:46
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
:
copyright_e_form_jcp19-ar-femto2019-04609r_sthler_eidxzv.pdf (Copyright transfer agreement), 476KB
 
File Permalink:
-
Name:
copyright_e_form_jcp19-ar-femto2019-04609r_sthler_eidxzv.pdf
Description:
-
OA-Status:
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-
:
1.5136075.pdf (Publisher version), 4MB
Name:
1.5136075.pdf
Description:
-
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
2020
Copyright Info:
AIP
License:
-

Locators

show

Creators

show
hide
 Creators:
Vempati, Sesha Pavan Kumar1, 2, Author           
Bogner, Lea2, Author           
Richter, Clemens2, Author           
Deinert, Jan-Christoph2, 3, Author           
Foglia, Laura2, 4, Author           
Gierster, Lukas2, Author           
Stähler, Julia2, Author           
Affiliations:
1Indian Institute of Technology Bhilai, ou_persistent22              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
3Helmholtz-Zentrum Dresden-Rossendorf, ou_persistent22              
4Elettra-Sincrotrone Trieste S.C.p.A., ou_persistent22              

Content

show
hide
Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci, Condensed Matter, Soft Condensed Matter, cond-mat.soft, Physics, Chemical Physics, physics.chem-ph
 Abstract: The conversion of optical and electrical energy in novel materials is key to modern optoelectronic and light-harvesting applications. Here, we investigate the equilibration dynamics of photoexcited 2,7-bis(biphenyl-4-yl)-2,7-ditertbutyl-9,9-spirobiuorene (SP6) molecules adsorbed on ZnO(10-10) using femtosecond time-resolved two-photon photoelectron (2PPE) and optical spectroscopy. We find that, after initial ultrafast relaxation on fs and ps timescales, an optically dark state is populated, likely the SP6 triplet (T) state, that undergoes Dexter-type energy transfer (rDex = 1.3 nm) and exhibits a long decay time of 0.1 s. Because of this long lifetime a photostationary state with average T-T distances below 2 nm is established at excitation densities in the 1020cm-2 s-1 range. This large density enables decay by T-T annihilation (TTA) mediating autoionization despite an extremely low TTA rate of kTTA = 4.5 10-26 m3s-1. The large external quantum efficiency of the autoionization process (up to 15 %) and photocurrent densities in the mA cm-2 range offer great potential for light-harvesting applications.

Details

show
hide
Language(s): eng - English
 Dates: 2019-11-112020-01-242020-02-202020-02-21
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: The Journal of Chemical Physics
  Other : J. Chem. Phys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: 10 Volume / Issue: 152 (7) Sequence Number: 074715 Start / End Page: - Identifier: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226