Spectroscopic evidence for trap-dominated magnetic field effects in organic semiconductors

M. Cox, M.H.W.A. Wijnen, G.A.H. Wetzelaer, M. Kemerink, P.M. Blom, B. Koopmans

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)
102 Downloads (Pure)

Abstract

Polaron traps are ubiquitous in organic semiconductors and recent evidence suggests they might be crucial for the large observed magnetic field effects (MFEs) in organic semiconductors. Here we measure MFEs in polymer thin-film devices with engineered, radiative trap sites in order to spectroscopically investigate the influence of the traps. Surprisingly, the luminescence at the trap sites and the polymer backbone is found to have an opposite response to a magnetic field. All our results are compatible with a mechanism in which spin mixing at the traps can create the large MFEs observed on the backbone. This scenario is quantitatively confirmed by numerical drift-diffusion modeling with magnetic-field-dependent exciton densities at the traps. These insights solve an outstanding controversy within the research field
Original languageEnglish
Article number155205
Number of pages7
JournalPhysical Review B
Volume90
Issue number15
DOIs
Publication statusPublished - 2014

Fingerprint Dive into the research topics of 'Spectroscopic evidence for trap-dominated magnetic field effects in organic semiconductors'. Together they form a unique fingerprint.

Cite this