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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Focus: Organic Solar Cells Based on Non-fullerene Acceptors: Loss Mechanism and Options for Above 20 % Efficiencies I

CPP 1.9: Vortrag

Montag, 27. März 2023, 12:15–12:30, GÖR 226

Photophysics of Poly(3-hexylthiophene):Non-Fullerene Acceptor Based Organic Solar Cells — •Wejdan Althobaiti, Jafar Khan, Julien Gorenflot, Shahidul Alam, George Harrison, Stefaan De Wolf, and Frédéric Laquai — King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Saudi Arabia

Charge generation can proceed through two different paths in Bulk Heterojunction based organic solar cells which are electron transfer from donor to acceptor and hole transfer from acceptor to donor. These processes can be controlled by Electron Affinity (EA) offsets and Ionization Energy (IE) offsets, respectively. Understanding the relationship between the IE offsets, EA offsets between donor and acceptor materials, and the performance of OSCs could improve the charge generation efficiency. We characterized the impact of large IE and EA offsets on device performances and more precisely on the internal quantum efficiency (IQE) using a wide bandgap polymer donor which has shallow IE such as P3HT and Non Fullerene Acceptor (NFA). This provides a wide range of diagonal bandgap (IE of the donor and EA of the acceptor). Thus, enables us to find the relation between small diagonal bandgap and the decrease of the IQE in energy gap law framework. Low IQE while high exciton quenching observed can be explained due to charge recombination as our results demonstrated by geminate and non-geminate recombination.