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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Organic Electronics and Photovoltaics I

CPP 3.4: Vortrag

Montag, 17. März 2025, 10:15–10:30, H38

The Role of Oxygen Insertion on Performance of A-D-A-type Non-Fullerene Acceptors (NFA) in Organic Solar Cells — •Wejdan Althobaiti¹, Yakun He¹, Julien Gorenflot¹, Wisnu Hadmojo¹, Sandeep Sharma¹, Filip Aniés¹, Weimin Zhang¹, Shahidul Alam¹, George Harrison¹, Anirudh Sharma¹, Shadi Fatayer¹, Derya Baran¹, Iain McCulloch², Thomas Anthopoulos¹, Martin Heeney¹, and Frédéric Laquai¹ — ¹King Abdullah University of Science and Technology (KAUST), Saudi Arabia — ²University of Oxford, UK

Charge transfer in OSCs can occur through two pathways: photo-induced electron transfer from the donor to the acceptor, controlled by the electron affinity (EA) offset, and photo-induced hole transfer from the acceptor to the donor, governed by the ionization energy (IE) offset. Here, we report the synthesis of a novel NFA coded TPTI-BT, whose properties were first predicted by computational chemistry before the material was synthesized. Despite the favorable properties for high device performance, TPTI-BT exhibited moderate device performance, in particular when compared with the structurally-related and efficient acceptor O-IDTBCN. In fact, the chemical structure of TPTI-BT is very similar to that of O-IDTBCN, it contains only two additional oxygen atoms in the donor core of the A-D-A-type acceptor backbone structure. Interestingly, this causes TPTI-BT to exhibit overall lower device performance. We present a comparative study of these two NFAs and elucidate the origin of the lower performance of the TPTI-BT caused by two additional oxygen atoms.

Keywords: Organic Photovoltaic; Energy levels; Quadrupole moment; A-D-A-type NFA; Non-fullerene, NFA