TY - JOUR
T1 - Silicon and Germanium Functionalized Perylene Diimides – Synthesis, Optoelectronic Properties, and their Application as Non-Fullerene Acceptors in Organic Solar Cells
AU - Schlemmer, Bettina
AU - Sauermoser, Aileen
AU - Holler, Sarah
AU - Zuccala, Elena
AU - Ehmann, Birgit
AU - Reinfelds, Matiss
AU - Fischer, Roland C.
AU - Amenitsch, Heinz
AU - Manuel Marin-Beloqui, Jose
AU - Ludvíková, Lucie
AU - Slanina, Tomáš
AU - Haas, Michael
AU - Rath, Thomas
AU - Trimmel, Gregor
PY - 2023/10/13
Y1 - 2023/10/13
N2 - Organic solar cells have been continuously studied and developed through the last decades. A major step in their development was the introduction of fused-ring non-fullerene electron acceptors. Yet, beside their high efficiency, they suffer from complex synthesis and stability issues. Perylene-based non-fullerene acceptors, in contrast, can be prepared in only a few steps and display good photochemical and thermal stability. Herein, we introduce four monomeric perylene diimide acceptors obtained in a three-step synthesis. In these molecules, the semimetals silicon and germanium were added in the bay position, on one or both sides of the molecules, resulting in asymmetric and symmetric compounds with a red-shifted absorption compared to unsubstituted perylene diimide. Introducing two germanium atoms improved the crystallinity and charge carrier mobility in the blend with the conjugated polymer PM6. In addition, charge carrier separation is significantly influenced by the high crystallinity of this blend, as shown by transient absorption spectroscopy. As a result, the solar cells reached a power conversion efficiency of 5.38 %, which is one of the highest efficiencies of monomeric perylene diimide-based solar cells recorded to date.
AB - Organic solar cells have been continuously studied and developed through the last decades. A major step in their development was the introduction of fused-ring non-fullerene electron acceptors. Yet, beside their high efficiency, they suffer from complex synthesis and stability issues. Perylene-based non-fullerene acceptors, in contrast, can be prepared in only a few steps and display good photochemical and thermal stability. Herein, we introduce four monomeric perylene diimide acceptors obtained in a three-step synthesis. In these molecules, the semimetals silicon and germanium were added in the bay position, on one or both sides of the molecules, resulting in asymmetric and symmetric compounds with a red-shifted absorption compared to unsubstituted perylene diimide. Introducing two germanium atoms improved the crystallinity and charge carrier mobility in the blend with the conjugated polymer PM6. In addition, charge carrier separation is significantly influenced by the high crystallinity of this blend, as shown by transient absorption spectroscopy. As a result, the solar cells reached a power conversion efficiency of 5.38 %, which is one of the highest efficiencies of monomeric perylene diimide-based solar cells recorded to date.
KW - donor-acceptor systems
KW - group 14 elements
KW - organic photovoltaics
KW - organometallics
KW - perylene diimides
UR - http://www.scopus.com/inward/record.url?scp=85169107251&partnerID=8YFLogxK
U2 - 10.1002/chem.202301337
DO - 10.1002/chem.202301337
M3 - Article
SN - 0947-6539
VL - 29
JO - Chemistry - a European Journal
JF - Chemistry - a European Journal
IS - 57
M1 - e202301337
ER -