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  4. Superweak Coordinating Anion as Superstrong Enhancer of Cyanine Organic Semiconductor Properties
 
research article

Superweak Coordinating Anion as Superstrong Enhancer of Cyanine Organic Semiconductor Properties

Gesevicius, Donatas
•
Neels, Antonia
•
Yakunin, Sergii
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December 19, 2018
Chemphyschem

The superweak tetrakis(nonafluoro-tert-butoxy)aluminate coordinating anion was employed to introduce pseudo-gas-phase conditions to the 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indolium chromophore. The resulting formation of a photoactive organic-inorganic hybrid salt has led to a highly stabilized excited state of the organic chromophore mainly due to the minimized lattice energy and Coulomb interactions. These highly beneficial features caused by the well dispersed negative charge of the anion have led to an enhanced neat spin-casted film fluorescence intensity, prolonged fluorescence lifetime, smooth thin film surfaces and a record power photovoltaic efficiency of 3.8 % when compared to organic salts of this particular chromophore containing anions with localised negative charge. Clear evidence is given that a superweak coordinating anion is an emerging key parameter in cyanine dye photochemistry. This approach can be seen as a general guideline to prepare highly efficient ionic dyes for organic semiconductor applications.

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Type
research article
DOI
10.1002/cphc.201800863
Web of Science ID

WOS:000453765300006

Author(s)
Gesevicius, Donatas
Neels, Antonia
Yakunin, Sergii
Hack, Erwin
Kovalenko, Maksym V.
Nuesch, Frank  
Heier, Jakob
Date Issued

2018-12-19

Published in
Chemphyschem
Volume

19

Issue

24

Start page

3356

End page

3363

Subjects

Chemistry, Physical

•

Physics, Atomic, Molecular & Chemical

•

Chemistry

•

Physics

•

weakly coordinating anions

•

cyanine dyes

•

fluorescence

•

lattice energy

•

organic photovoltaics

•

cationic polymethine dyes

•

symmetry-breaking

•

noncoordinating anions

•

lewis-acids

•

solar-cells

•

chemistry

•

oxidation

•

energies

•

formula

•

lattice

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
UPNUES  
Available on Infoscience
January 3, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/153326
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