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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 77: Organic Electronics and Photovoltaics - Transport and Doping
CPP 77.7: Talk
Friday, March 16, 2018, 11:30–11:45, C 243
Doping of Semiconducting Polymers: Structural Order and Dopant Drift — •Lars Müller1,2,3, Sebastian Beck1,3, Wenlan Liu1,4, Annemarie Pucci1,3, Andreas Köhn4, Wolfgang Kowalsky1,2,3, and Robert Lovrincic1,2 — 1InnovationLab, Heidelberg, Germany — 2Institute for High-Frequency Technology, TU Braunschweig, Germany — 3Kirchhoff Institute for Physics, Heidelberg University, Germany — 4Institute for Theoretical Chemistry, University of Stuttgart, Germany
Electrical doping of organic semiconductors is widely applied to fabricate high performance organic electronic devices. First, this contribution studies the electric-field-induced drift of molecular dopants for different host-dopant combinations and the influence of structural order on this drift [1]. Second, we present a study that focuses on the spatial position of dopant molecules in P3HT crystallites, together with a DFT-based approach that can explain the observed changes in π-π lattice spacing without the need for a dopant intercalation. The drift study includes Poly(3-hexylthiophene-2,5-diyl) (P3HT) doped with 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), as well as larger dopant molecules and different host materials. We find that the dynamic drift-process can be utilized to deliberately create highly doped and almost undoped regions within one thin film, resulting in a spatially altered conductivity. The applicability is shown on proof-of-principle memristive devices that are based on this effect.
[1] L. Müller et al., Adv. Mater. 2017, 1701466.