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  Uncovering the (un-)occupied electronic structure of a buried hybrid interface

Vempati, S. P. K., Deinert, J.-C., Gierster, L., Bogner, L., Richter, C., Mutz, N., et al. (2019). Uncovering the (un-)occupied electronic structure of a buried hybrid interface. Journal of Physics: Condensed Matter, 31(9): 094001. doi:10.1088/1361-648X/aaf98a.

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Vempati_2019_J._Phys.__Condens._Matter_31_094001.pdf (Publisher version), 3MB
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Vempati, Sesha Pavan Kumar1, 2, Author           
Deinert, Jan-Christoph1, 3, Author           
Gierster, Lukas1, Author           
Bogner, Lea1, Author           
Richter, Clemens1, 4, Author           
Mutz, N.5, Author
Blumstengel, S.5, Author
Zykov, A.5, Author
Kowarik, S.5, Author
Garmshausen, Y.6, Author
Hildebrandt, J.6, Author
Hecht, S. 6, Author
Stähler, Julia1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Department of Physics, Indian Institute of Technology Bhilai, Raipur-492015, India, ou_persistent22              
3Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany, ou_persistent22              
4Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, 04318 Leipzig, Germany, ou_persistent22              
5Humboldt Universität zu Berlin, Institut für Physik & IRIS Adlershof, Newtonstr. 15, 12489 Berlin, Germany, ou_persistent22              
6Humboldt Universität zu Berlin, Institut für Chemie & IRIS Adlershof, Brook-Taylor-Str. 2, 12489 Berlin, Germany, ou_persistent22              

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 Abstract: The energy level alignment at organic/inorganic (o/i) semiconductor interfaces is crucial for any light-emitting or -harvesting functionality. Essential is the access to both occupied and unoccupied electronic states directly at the interface, which is often deeply buried underneath thick organic films and challenging to characterize. We use several complementary experimental techniques to determine the electronic structure of p-quinquephenyl pyridine (5P-Py) adsorbed on ZnO(1 0 −1 0). The parent anchoring group, pyridine, significantly lowers the work function by up to 2.9 eV and causes an occupied in-gap state (IGS) directly below the Fermi level EF. Adsorption of upright-standing 5P-Py also leads to a strong work function reduction of up to 2.1 eV and to a similar IGS. The latter is then used as an initial state for the transient population of three normally unoccupied molecular levels through optical excitation and, due to its localization right at the o/i interface, provides interfacial sensitivity, even for thick 5P-Py films. We observe two final states above the vacuum level and one bound state at around 2 eV above EF, which we attribute to the 5P-Py LUMO. By the separate study of anchoring group and organic dye combined with the exploitation of the occupied IGS for selective interfacial photoexcitation, this work provides a new pathway for characterizing the electronic structure at buried o/i interfaces.

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Language(s): eng - English
 Dates: 2018-12-102018-10-312018-12-182019-01-162019-03-09
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1361-648X/aaf98a
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Title: Journal of Physics: Condensed Matter
  Abbreviation : J. Phys. Condens. Matter.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: 10 Volume / Issue: 31 (9) Sequence Number: 094001 Start / End Page: - Identifier: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478