Berlin 2024 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.23: Poster

Wednesday, March 20, 2024, 11:30–13:30, Poster C

Detecting photogenerated charge carriers and triplet excitons of NFA-based solar-cell-acceptors using spin-sensitive spectroscopy — •Michael Bulgakov¹, Anastasia Kultaeva¹, Shahidul Alam², Vladimir Dyakonov¹, and Andreas Sperlich¹ — ¹Experimental Physics 6, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany — ²King Abdullah University of Science and Technology, Thuwal 23955-6900,Kingdom of Saudi Arabia

Since non-fullerene acceptors (NFAs) have outperformed their fullerene-based counterparts, there has been a concentrated effort in research to further enhance their performance as acceptor materials in organic solar cells. Contrary to fullerenes, where the C60-molecules provide little possibility for variation, NFAs offer a rich playground for adjusting chain lengths, incorporating functional side chains and further modifications on a molecular level. In this study, we examine five novel and promising materials that came out of this variation process. Using Electron Spin Resonance (ESR) and Optically Detected Magnetic Resonance (ODMR) techniques we detect and analyze charge carrier production and triplet-state recombination processes. The insights obtained from this investigation will offer valuable guidance for further optimizing the functionality of NFAs, paving the way to surpass the 20% performance threshold.

Keywords: Organic Photovoltaics; Organic Solar Cells; ESR; ODMR; NFA