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Structure of thin films of [6] and [7]phenacene and impact of potassium deposition

DOI: 10.1002/adom.202002193 DOI Help

Authors: Matthias Zwadlo (Universität Tübingen) , Jakub Hagara (Institute of Physics, Slovak Academy of Sciences) , Giuliano Duva (Universität Tübingen) , Jan Hagenlocher (University of Tuebingen) , Alexander Gerlach (Universität Tübingen) , Ivan Zaluzhnyy (Universität Tübingen) , Martin Hodas (Universität Tübingen) , Alexander Hinderhofer (University of Tübingen) , Peter Siffalovic (Institute of Physics, Slovak Academy of Sciences) , Frank Schreiber (Universität Tübingen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Optical Materials , VOL 5

State: Published (Approved)
Published: March 2021

Open Access Open Access

Abstract: Organic semiconductors offer a flexibility in band gap tuning through different molecular lengths and have shown to be promising candidates for high‐performance electronic devices. While electronic properties have been extensively studied in many publications, the topic of thin film structure and molecular packing is still quite neglected. In this work, the thin film crystal structure of [6]phenacene (Fulminene) and [7]phenacene deposited on silicon substrates using the OMBD method as well as further studies with potassium deposition on [6]phenacene are investigated. Ex‐situ X‐ray and optical methods are employed to obtain an insight into the crystal structure and optical properties. The orientation of the molecules and the unit cell structure is calculated from the measured reciprocal space maps. Additionally, the influence of a possible interfacial doping mechanism by deposition of potassium on top of [6]phenacene is investigated. Thin films of [6]phenacene show a high crystallinity with a standing‐up configuration and a similar molecular structure and symmetry compared to [4]phenacene. [7]phenacene features two different apparently thickness‐dependent polymorphs (H and L) with a structure similar to [5]phenacene. These results reveal that odd/even parity, that is, even or odd number of benzene rings, directly influences the phenacene thin film structure.

Journal Keywords: doping; molecular packing; organic semiconductors; phenacene; thin film morphology; thin film structure

Diamond Keywords: Semiconductors

Subject Areas: Materials, Physics, Chemistry

Instruments: I07-Surface & interface diffraction

Other Facilities: ID10 at ESRF; P03 at Deutsches Elekronen Synchrotron (DESY)

Added On: 15/03/2021 09:22


Discipline Tags:

Organic Chemistry Materials Science Physics Electronics Surfaces interfaces and thin films Chemistry

Technical Tags:

Diffraction X-ray Reflectivity (XRR)