Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Organic Electronics and Photovoltaics I

CPP 18.2: Vortrag

Dienstag, 19. März 2024, 10:00–10:15, H 0110

Coordination of tetracyanoquinodimethane-derivatives with tris(pentafluorophenyl)borane provides stronger p-dopants with enhanced stability — •Andreas Opitz¹, Ahmed E. Mansour^2,1, Ross Warren¹, Dominique Lungwitz¹, Michael Forster³, Ullrich Scherf³, Moritz Malischewski⁴, and Norbert Koch^1,2 — ¹Humboldt-Universität zu Berlin — ²Helmholtz-Zentrum Berlin für Materialien und Energie GmbH — ³Bergische Universität Wuppertal — ⁴Freie Universität Berlin

Strong molecular dopants for organic semiconductors that are stable against diffusion are in demand, to enhance the performance of organic optoelectronic devices. In this study, we demonstrate the coordination of TCNQ-derivatives with four B(C₆F₅)₃ molecules using a single-step solution mixing process. This results in the formation of bulky dopant complexes, ’FxTCN(N)Q-4[B(C₆F₅)₃]’, exhibiting higher oxidation strength than the original materials themselves. [1] Optical and electrical transport measurements with the prototypical P3HT confirm the higher doping efficiency of FxTCN(N)Q-4[B(C₆F₅)₃] compared to F4TCNQ. Additionally, the bulkier structure of FxTCN(N)Q-4[B(C₆F₅)₃] is shown to result in higher stability against drift in P3HT under an applied electric field as compared to F4TCNQ. This simple approach of solution-mixing of readily accessible molecules provides the community with access to enhanced molecular p-dopants.
[1] A.E. Mansour et al., ACS Appl. Mater. Interfaces 15 (2023) 46148.

Keywords: doping; polymers