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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.51: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
IR Spectroscopic Investigation on Immobilization of organic dopants — •Rainer Bäuerle1,2,3, Patrick Reiser1,4, Frank Simon Benneckendorf1,3,4, Marc-Michael Barf1,5, Sebastian Beck1,2, Annemarie Pucci1,2, Uwe H. F. Bunz1,3, and Wolfgang Kowalsky1,5 — 1InnovationLab, Heidelberg — 2Kirchhoff Institute for Physics, University of Heidelberg — 3Organisch-Chemisches Institut, University of Heidelberg — 4Materials Science Department, Surface Science Division, TU Darmstadt — 5Institute for High-Frequency Technology, TU Braunschweig
One challenge in doping of organic semiconductors lies in the unstable spatial distribution of dopants. The simple intermixing of dopants to a matrix semiconductor makes them subject to diffusion and drift. With a universal anchor group that covalently binds to most semiconductors this problem can be overcome. We investigate the influence of an azide group as such anchor in a semiconductor thin film on the diffusion of dopants via infrared spectroscopy.
A derivate of the literature known n-dopant DMBI without anchor leaves a film of PCBM under UHV conditions undoped in time. The same dopant anchored via an azide group remains in the film after days in UHV proofing a successfull suppression of diffusion. During UV activation of the anchor only the azide absorption band vanishes indicating no major disintegration of both dopant and matrix. Unaltered electric properties make this approach feasible for use in organic devices. The universal use is demonstrated by successfully anchoring in the n-type small molecule PCBM and in the p-type polymer P3HT.