skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Prototypical Organic–Oxide Interface: Intramolecular Resolution of Sexiphenyl on In 2O 3 (111)

Abstract

The performance of an organic semiconductor device is critically determined by the geometric alignment, orientation, and ordering of the organic molecules. Although an organic multilayer eventually adopts the crystal structure of the organic material, the alignment and configuration at the interface with the substrate/electrode material are essential for charge injection into the organic layer. This work focuses on the prototypical organic semiconductor para-sexiphenyl (6P) adsorbed on In 2O 3(111), the thermodynamically most stable surface of the material that the most common transparent conducting oxide, indium tin oxide, is based on. The onset of nucleation and formation of the first monolayer are followed with atomically resolved scanning tunneling microscopy and noncontact atomic force microscopy (nc-AFM). Annealing to 200 °C provides sufficient thermal energy for the molecules to orient themselves along the high-symmetry directions of the surface, leading to a single adsorption site. The AFM data suggests an essentially planar adsorption geometry. With increasing coverage, the 6P molecules first form a loose network with a poor long-range order. Eventually, the molecules reorient into an ordered monolayer. In conclusion, this first monolayer has a densely packed, well-ordered (2 × 1) structure with one 6P per In 2O 3(111) substrate unit cell, that is,more » a molecular density of 5.64 × 10 13 cm –2.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1]
  1. TU Wien, Vienna (Austria)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1435483
Alternate Identifier(s):
OSTI ID: 1437896
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Published Article
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 10; Journal Issue: 16; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; adsorption site; atomic force microscopy; indium oxide; monolayer; organic molecules; scanning tunneling microscopy; sexiphenyl

Citation Formats

Wagner, Margareta, Hofinger, Jakob, Setvin, Martin, Boatner, Lynn A., Schmid, Michael, and Diebold, Ulrike. Prototypical Organic–Oxide Interface: Intramolecular Resolution of Sexiphenyl on In2O3 (111). United States: N. p., 2018. Web. doi:10.1021/acsami.8b02177.
Wagner, Margareta, Hofinger, Jakob, Setvin, Martin, Boatner, Lynn A., Schmid, Michael, & Diebold, Ulrike. Prototypical Organic–Oxide Interface: Intramolecular Resolution of Sexiphenyl on In2O3 (111). United States. doi:10.1021/acsami.8b02177.
Wagner, Margareta, Hofinger, Jakob, Setvin, Martin, Boatner, Lynn A., Schmid, Michael, and Diebold, Ulrike. Wed . "Prototypical Organic–Oxide Interface: Intramolecular Resolution of Sexiphenyl on In2O3 (111)". United States. doi:10.1021/acsami.8b02177.
@article{osti_1435483,
title = {Prototypical Organic–Oxide Interface: Intramolecular Resolution of Sexiphenyl on In2O3 (111)},
author = {Wagner, Margareta and Hofinger, Jakob and Setvin, Martin and Boatner, Lynn A. and Schmid, Michael and Diebold, Ulrike},
abstractNote = {The performance of an organic semiconductor device is critically determined by the geometric alignment, orientation, and ordering of the organic molecules. Although an organic multilayer eventually adopts the crystal structure of the organic material, the alignment and configuration at the interface with the substrate/electrode material are essential for charge injection into the organic layer. This work focuses on the prototypical organic semiconductor para-sexiphenyl (6P) adsorbed on In2O3(111), the thermodynamically most stable surface of the material that the most common transparent conducting oxide, indium tin oxide, is based on. The onset of nucleation and formation of the first monolayer are followed with atomically resolved scanning tunneling microscopy and noncontact atomic force microscopy (nc-AFM). Annealing to 200 °C provides sufficient thermal energy for the molecules to orient themselves along the high-symmetry directions of the surface, leading to a single adsorption site. The AFM data suggests an essentially planar adsorption geometry. With increasing coverage, the 6P molecules first form a loose network with a poor long-range order. Eventually, the molecules reorient into an ordered monolayer. In conclusion, this first monolayer has a densely packed, well-ordered (2 × 1) structure with one 6P per In2O3(111) substrate unit cell, that is, a molecular density of 5.64 × 1013 cm–2.},
doi = {10.1021/acsami.8b02177},
journal = {ACS Applied Materials and Interfaces},
number = 16,
volume = 10,
place = {United States},
year = {Wed Mar 28 00:00:00 EDT 2018},
month = {Wed Mar 28 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1021/acsami.8b02177

Save / Share: