Abstract
This paper reports the design, facile synthesis and purification of four π-conjugated donor-acceptor small molecules comprising heteroaromatic units, DA-1–DA-4, for surface and electronic structure modification of gold thin film. These molecules were characterized by 1H/13C nuclear magnetic resonance spectroscopy, cyclic voltammetry, UV–Vis spectroscopy, and single-crystal X-ray diffraction. Morphologically smooth thin-films (~ 5 nm) of DA-1–DA-4 were deposited onto Au thin films via thermal evaporation and characterized by atomic force-microscopy, θ–2θ X-ray diffraction and ultraviolet photoelectron spectroscopy. The work functions of the small molecule coated Au electrodes are shifted to lower energies by ~ 0.1–0.3 eV, compared to that of the bare Au film measured as a reference. The vapor-deposition of structurally simple small molecules developed here shows great promise as a facile approach to reduce gold work function for electron injection/extraction between organic semiconductors and Au contacts in various opto-electronic devices.
Original language | English (US) |
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Pages (from-to) | 320-327 |
Number of pages | 8 |
Journal | Thin Solid Films |
Volume | 616 |
DOIs | |
State | Published - Oct 1 2016 |
Funding
This project was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University of Saudi Arabia , under grant no. 80-130-35-HiCi . The authors, therefore, acknowledge with thanks DSR technical and financial support.
Keywords
- Conducting electrode
- Donor-acceptor small molecule
- Organic thin-film
- Synthesis and characterization
- Ultraviolet photoelectron spectroscopy
- Work-function reduction
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry
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DOI: 10.5517/ccdc.csd.cc11xv2w, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc11xv2w&sid=DataCite
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