Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 57: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics VIII
CPP 57.1: Talk
Friday, March 13, 2026, 11:30–11:45, ZEU/LICH
Novel n-Dopants for Improving Organic Solar Cells — •Yahya Asl Soleimani1, Nora Engelmann1, Stephanie Buchholtz1, Jörn Vahland2, Adrian Kishonti2, Steffen Woltering2, Karl Leo1, and Johannes Benduhn1 — 1Institute of Applied Physics, Technische Universität Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany — 2CREDOXYS GmbH, Liebigstraße 26, 01187, Dresden, Germany
Doping is a crucial concept in semiconductor technology, and it is no different for organic semiconductors. It increases conductivity and facilitates carrier injection and extraction. While substantial success has been achieved for organic molecular p-dopants, the same cannot be said for n-dopants. They suffer from an inherent disadvantage: the highest occupied molecular orbital (HOMO) of the n-dopant must be lower than the lowest unoccupied molecular orbital (LUMO) of the host, rendering them typically unstable under ambient conditions. Here, we report a new and efficient molecular n-dopant that can dope C60 to a conductivity of 20 S/cm. We investigate the origin of its efficacy and explore the doping mechanism using ultraviolet electron spectroscopy (UPS). Moreover, we incorporate the new n-dopant into organic solar cells, demonstrating its effectiveness by improving the power conversion efficiency of the reference devices.
Keywords: Organic Electronics; Dopants; Solar Cells