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  - Kim, Jin Hong
A1  - Schembri, Tim
A1  - Bialas, David
A1  - Stolte, Matthias
A1  - Würthner, Frank
T1  - Slip‐Stacked J‐Aggregate Materials for Organic Solar Cells and Photodetectors
BT  - This paper is dedicated to Prof. Daoben Zhu on the occasion of his 80th birthday
JF  - Advanced Materials
N2  - Dye–dye interactions affect the optical and electronic properties in organic semiconductor films of light harvesting and detecting optoelectronic applications. This review elaborates how to tailor these properties of organic semiconductors for organic solar cells (OSCs) and organic photodiodes (OPDs). While these devices rely on similar materials, the demands for their optical properties are rather different, the former requiring a broad absorption spectrum spanning from the UV over visible up to the near‐infrared region and the latter an ultra‐narrow absorption spectrum at a specific, targeted wavelength. In order to design organic semiconductors satisfying these demands, fundamental insights on the relationship of optical properties are provided depending on molecular packing arrangement and the resultant electronic coupling thereof. Based on recent advancements in the theoretical understanding of intermolecular interactions between slip‐stacked dyes, distinguishing classical J‐aggregates with predominant long‐range Coulomb coupling from charge transfer (CT)‐mediated or ‐coupled J‐aggregates, whose red‐shifts are primarily governed by short‐range orbital interactions, is suggested. Within this framework, the relationship between aggregate structure and functional properties of representative classes of dye aggregates is analyzed for the most advanced OSCs and wavelength‐selective OPDs, providing important insights into the rational design of thin‐film optoelectronic materials.
KW  - crystal engineering
KW  - exciton coupling
KW  - J‐aggregates
KW  - organic photodiodes
KW  - organic solar cells
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-276537
VL  - 34
IS  - 22
ER  -