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  Impact of Nanomorphology on Surface Doping of Organic Semiconductors: The Pentacene-C60F48 Interface

Silvestri, F., Prieto, M., Babuji, A., Tanase, L. C., Caldas, L. d. S., Solomeshch, O., et al. (2020). Impact of Nanomorphology on Surface Doping of Organic Semiconductors: The Pentacene-C60F48 Interface. ACS Applied Materials and Interfaces, 12(22), 25444-25452. doi:10.1021/acsami.0c05583.

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 Creators:
Silvestri, Francesco1, Author
Prieto, Mauricio2, Author              
Babuji, Adara1, Author
Tanase, Liviu Cristian2, Author              
Caldas, Lucas de Souza2, Author              
Solomeshch, Olga3, Author
Schmidt, Thomas2, Author              
Ocal, Carmen1, Author
Barrena, Esther1, Author
Affiliations:
1Instituto de Ciencia de Materiales de Barcelona (ICMAB-CSIC), Bellaterra, Barcelona, 08193, Spain, ou_persistent22              
2Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              
3Electrical Engineering Department, Nanoelectronic Center, Technion, Haifa 32000, Israel, ou_persistent22              

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 Abstract: Establishing the rather complex correlation between the structure and the charge transfer in organic–organic heterostructures is of utmost importance for organic electronics and requires spatially resolved structural, chemical, and electronic details. Insight into this issue is provided here by combining atomic force microscopy, Kelvin probe force microscopy, photoemission electron microscopy, and low-energy electron microscopy for investigating a case study. We select the interface formed by pentacene (PEN), benchmark among the donor organic semiconductors, and a p-type dopant from the family of fluorinated fullerenes. As for Buckminsterfullerene (C60), the growth of its fluorinated derivative C60F48 is influenced by the thickness and crystallinity of the PEN buffer layer, but the behavior is markedly different. We provide a microscopic description of the C60F48/PEN interface formation and analyze the consequences in the electronic properties of the final heterostructure. For just one single layer of PEN, a laterally complete but noncompact C60F48/PEN interface is created, importantly affecting the surface work function. Nonetheless, from the very beginning of the second layer formation, the presence of epitaxial and nonepitaxial PEN domains dramatically influences the growth dynamics and extremely well packed two-dimensional C60F48 islands develop. Insightful elemental maps of the C60F48/PEN surface spatially resolve the nonuniform distribution of the dopant molecules, which leads to a heterogeneous work function landscape.

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Language(s): eng - English
 Dates: 2020-03-252020-05-112020-05-112020-06-03
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsami.0c05583
 Degree: -

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Title: ACS Applied Materials and Interfaces
  Other : ACS Applied Materials & Interfaces
  Abbreviation : ACS Appl. Mater. Interfaces
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: 9 Volume / Issue: 12 (22) Sequence Number: - Start / End Page: 25444 - 25452 Identifier: ISSN: 1944-8244
CoNE: https://pure.mpg.de/cone/journals/resource/1944-8244