TY  - JOUR
A1  - Menekse, Kaan
A1  - Mahl, Magnus
A1  - Albert, Julius
A1  - Niyas, M. A.
A1  - Shoyama, Kazutaka
A1  - Stolte, Matthias
A1  - Würthner, Frank
T1  - Supramolecularly Engineered Bulk‐Heterojunction Solar Cells with Self‐Assembled Non‐Fullerene Nanographene Tetraimide Acceptors
JF  - Solar RRL
N2  - A series of novel imide‐functionalized C\(_{64}\) nanographenes is investigated as acceptor components in organic solar cells (OSCs) in combination with donor polymer PM6. These electron‐poor molecules either prevail as a monomer or self‐assemble into dimers in the OSC active layer depending on the chosen imide substituents. This allows for the controlled stacking of electron‐poor and electron‐rich π–scaffolds to establish a novel class of non‐fullerene acceptor materials to tailor the bulk‐heterojunction morphology of the OSCs. The best performance is observed for derivatives that are able to self‐assemble into dimers, reaching power conversion efficiencies of up to 7.1%.
KW  - nanographene
KW  - non-fullerene acceptors
KW  - organic solar cells
KW  - polycyclic aromatic hydrocarbons
KW  - self-assembly
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-312099
VL  - 7
IS  - 2
ER  - 
TY  - JOUR
A1  - Brust, Felix
A1  - Nagler, Oliver
A1  - Shoyama, Kazutaka
A1  - Stolte, Matthias
A1  - Würthner, Frank
T1  - Organic Light‐Emitting Diodes Based on Silandiol‐Bay‐Bridged Perylene Bisimides
JF  - Advanced Optical Materials
N2  - Perylene bisimides (PBIs) are among the best fluorophores but have to be enwrapped for optoelectronic applications by large and heavy substituents to prevent their ππ‐stacking, which is known to accelerate non‐radiative decay processes in the solid state. Here, light‐weight di‐tert‐butylsilyl groups are introduced to bridge 1,12‐dihydroxy and 1,6,7,12‐tetrahydroxy PBIs to afford sublimable dyes for vacuum‐processed optoelectronic devices. For both new compounds, this substitution provides a twisted and shielded perylene π‐core whose, via OSiObridges, rigid structure affords well‐resolved absorption and emission spectra with strong fluorescence in solution, as well as in the solid state. The usefulness of these dyes for vacuum‐processed optoelectronic devices is demonstrated in organic light‐emitting diodes (OLEDs) that show monomer‐like emission spectra and high maximum external quantum efficiency (EQEmax) values of up to 3.1% for the doubly silicon‐bridged PBI.
KW  - organic light emitting diodes
KW  - perylene bisimide dyes
KW  - rigidification
KW  - solid‐state emission
KW  - vacuum processable
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-312599
VL  - 11
IS  - 5
ER  -