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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 32: Crystal Structure Defects / Real Structure / Microstructure II

KFM 32.1: Talk

Friday, March 22, 2024, 09:30–09:50, E 124

Novel class of rubrene single crystals with enhanced stability — •Moha Naeimi, Katharina Engster, Regina Lange, Tim Völzer, Stefan Lochbrunner, Ingo Barke, and Sylvia Speller — University of Rostock, Institute of physics, Rostock, Germany

Rubrene is an organic semiconductor recognized for its favorable properties, including high charge carrier mobility and excellent thermal stability. Its conjugated structure makes it a promising material for use in organic electronic devices. The precise control of rubrene crystallization, evolving from an amorphous to the stable orthorhombic phases enables comprehensive study of optical and electronic properties [1], as well as the investigation of exciton distribution and dynamics [2]. Through precise control of amorphous rubrene deposition on the substrate, high-rate heating and enhanced partial pressure [3], we introduce a novel class of rubrene single crystals in orthorhombic phase with different crystal orientations. Distinguished by ultra-flat and smooth surfaces with an hourglass shaped signature exhibiting four different zones of two types (i.e., diamond and triangle shaped), we characterize their optical properties and investigate their surface potential.

[1] Kathryn A. McGarry et al., Chem.Mater.2013, 25, 2254-2263

[2] Pavel Irkhin and Ivan Biaggio, Phys. Rev. Lett. 2011, 107, 017402

[3] Xin Ye et al. Chem. Mater. 2018, 30, 2, 412-420

Keywords: rubrene; single crystal; FLIM; KPFM; hourglass