NDLI: Ultraviolet photoelectron spectroscopy reveals energy-band dispersion forπ-stacked 7,8,15,16-tetraazaterrylene thin films in a donor

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Ultraviolet photoelectron spectroscopy reveals energy-band dispersion forπ-stacked 7,8,15,16-tetraazaterrylene thin films in a donor–acceptor bulk heterojunction

Content Provider	Scilit
Author	Aghdassi, Nabi Wang, Qi Ji, Ru-Ru Wang, Bin Fan, Jian Duhm, Steffen
Copyright Year	2018
Description	Journal: Nanotechnology 7,8,15,16-tetraazaterrylene (TAT) thin films grown on highly oriented pyrolytic graphite (HOPG) substrates were studied extensively with regard to their intrinsic and interfacial electronic properties by means of ultraviolet photoelectron spectroscopy (UPS). Merely weak substrate-adsorbate interaction occurs at the TAT/HOPG interface, with interface energetics being only little affected by the nominal film thickness. Photon energy-dependent UPS performed perpendicular to the molecular planes of TAT multilayer films at room temperature clearly reveals band-like intermolecular dispersion of the TAT highest occupied molecular orbital (HOMO) energy. Based on a comparison with a tight-binding (TB) model, a relatively narrow bandwidth of 54 meV is derived, which points to the presence of an intermediate regime between hopping and band-like hole transport. Upon additional deposition of 2,2':5',2'':5'',2'''-quaterthiophene (4T), a 4T:TAT donor-acceptor bulk heterojunction with a considerable HOMO-level offset at the donor-acceptor interface is formed. The 4T:TAT bulk heterojunction likewise exhibits intermolecular dispersion of the TAT HOMO energy, yet with a significant decreased bandwidth.
Related Links	http://iopscience.iop.org/article/10.1088/1361-6528/aab0c8/pdf
ISSN	09574484
e-ISSN	13616528
DOI	10.1088/1361-6528/aab0c8
Journal	Nanotechnology
Issue Number	19
Volume Number	29
Language	English
Publisher	IOP Publishing
Publisher Date	2018-02-20
Access Restriction	Open
Subject Keyword	Journal: Nanotechnology Atomic, Molecular and Chemical Physics Interfacial Energy-level Alignment Intermolecular Energy-band Dispersion Organic-organic Interfaces Ultraviolet Photoelectron Spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Mechanics of Materials Mechanical Engineering Bioengineering Electrical and Electronic Engineering

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