DescriptionPerylene monoimide (PMI) based electron acceptors have great properties for use in organic solar cells, like thermal stability and strong light absorption. However, as most organic semiconductors, they typically exhibit low dielectric permittivities and are processed form halogenated solvents. Both limitations reduce their maximum efficiency as well as their attractiveness as green technology.
To overcome both limitations at once, this work focuses on introducing polar flexible side-chains into PMI-L-PMI acceptor structure (L…fluorene/carbazole). The molecules were modified with sulfone and sulfone-ether chains to improve the solubility in non-halogenated solvents and the permittivity via the Clausius-Mossotti relationship.
We found, that some of the new compounds show the desired combination of improved permittivity and solubility in non-halogenated solvents. This combination enabled us to fabricate solar cells in a simple bilayer setup (see Figure 1, using PTQ10 as donor polymer) using only non-halogenated solvents such as o-xylene and THF. That way, efficiencies of over 5% were achieved together with outstanding open-circuit voltages of around 1.3 V, making them an attractive choice as solar cell material.
|Period||21 Sep 2022|
|Event title||Österreichische Chemietage 2022: Green Chemistry - For a sustainable Europe|
|Location||Wien, AustriaShow on map|
|Degree of Recognition||National|