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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.61: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Simultaneously enhanced performance and stability of NFA solar cells with PETMP interfacial process — •Zerui Li1,2, Changqi Ma2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2i-Lab &Printed Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123, P. R. China
With the rapid development of novel non-fullerene acceptors (NFA), the PCE of NFA solar cells has reached over 18.6%, while the poor stability is still the limitation for application. For NFA solar cells, the hydroxyl radicals of ZnO forming under illumination would cause the degradation of the acceptor material, which is one key source for performance decrease. They could be effectively suppressed through modifying ZnO with radical trapping agents, such as 2-phenylethylmercaptan (PET). Unfortunately, PET is highly toxic with a bad smell. Here, PETMP with similar end group as PET is used as the alternative and it's found to be able to suppress the formation of hydroxyl radicals as well as to improve the device stability. Moreover, PETMP can improve the Jsc of devices through promoting the vertical phase separation of the active layer. Lastly, other similar derivatives is also tried and the amount of sulfhydryl is found to be highly important to the enhanced performance and stability, since only molecules with more sulfhydryl groups could work well. The interaction between PETMP and ZnO is the key factor promoting such a benefit. This work provides a perfect interfacial modification agent for more stable NFA solar cells.