TY  - JOUR
A1  - Wen, Xinbo
A1  - Nowak-Król, Agnieszka
A1  - Nagler, Oliver
A1  - Kraus, Felix
A1  - Zhu, Na
A1  - Zheng, Nan
A1  - Müller, Matthias
A1  - Schmidt, David
A1  - Xie, Zengqi
A1  - Würthner, Frank
T1  - Tetrahydroxy-perylene bisimide embedded in zinc oxide thin film as electron transporting layer for high performance non-fullerene organic solar cells
JF  - Angewandte Chemie International Edition
N2  - By introduction of four hydroxy (HO) groups into the two perylene bisimide (PBI) bay areas, new HO‐PBI ligands were obtained which upon deprotonation can complex ZnII ions and photosensitize semiconductive zinc oxide thin films. Such coordination is beneficial for dispersing PBI photosensitizer molecules evenly into metal oxide films to fabricate organic–inorganic hybrid interlayers for organic solar cells. Supported by the photoconductive effect of the ZnO:HO‐PBI hybrid interlayers, improved electron collection and transportation is achieved in fullerene and non‐fullerene polymer solar cell devices, leading to remarkable power conversion efficiencies of up to 15.95 % for a non‐fullerene based organic solar cell.
KW  - hydroxylation
KW  - metal complexenes
KW  - perylene bisimide
KW  - photoconductive interlayer
KW  - solar cells
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-204723
VL  - 58
IS  - 37
ER  - 
TY  - JOUR
A1  - Wildervanck, Martijn J.
A1  - Hecht, Reinhard
A1  - Nowak-Król, Agnieszka
T1  - Synthesis and strong solvatochromism of push-pull thienylthiazole boron complexes
JF  - Molecules
N2  - The solvatochromic behavior of two donor-π bridge-acceptor (D-π-A) compounds based on the 2-(3-boryl-2-thienyl)thiazole π-linker and indandione acceptor moiety are investigated. DFT/TD-DFT calculations were performed in combination with steady-state absorption and emission measurements, along with electrochemical studies, to elucidate the effect of two different strongly electron-donating hydrazonyl units on the solvatochromic and fluorescence behavior of these compounds. The Lippert–Mataga equation was used to estimate the change in dipole moments (Δµ) between ground and excited states based on the measured spectroscopic properties in solvents of varying polarity with the data being supported by theoretical studies. The two asymmetrical D-π-A molecules feature strong solvatochromic shifts in fluorescence of up to ~4300 cm\(^{−1}\) and a concomitant change of the emission color from yellow to red. These changes were accompanied by an increase in Stokes shift to reach values as large as ~5700–5800 cm\(^{−1}\). Quantum yields of ca. 0.75 could be observed for the N,N-dimethylhydrazonyl derivative in nonpolar solvents, which gradually decreased along with increasing solvent polarity, as opposed to the consistently reduced values obtained for the N,N-diphenylhydrazonyl derivative of up to ca. 0.20 in nonpolar solvents. These two push–pull molecules are contrasted with a structurally similar acceptor-π bridge-acceptor (A-π-A) compound.
KW  - solvatochromism
KW  - donor–acceptor
KW  - fluorescence
KW  - hydrazone
KW  - Lippert–Mataga plot
KW  - push–pull thienylthiazole
KW  - tetracoordinated boron
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-286186
SN  - 1420-3049
VL  - 27
IS  - 17
ER  -