Work function reduction by a redox-active organometallic sandwich complex

Alexander Hyla, Paul Winget, Hong Li, Chad Risko, Jean-Luc Bredas

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have investigated, at the density functional theory level, the geometric and electronic structures of the pentamethyliridocene (IrCpCp*) monomer and dimer adsorbed on the Au(111) and indium tin oxide (ITO) (222) surfaces, as well as their impact on the work functions. Our calculations show that the adsorption of a monomer lowers the work function of ITO(222) by 1.2 eV and Au(111) by 1.2–1.3 eV. The main origin for this reduction is the formation of an interface dipole between the monomer and the substrate via charge transfer. Dimer adsorption as well as adsorption of possible byproducts formed from dimer bond-cleavage in solution, show a lesser ability to lower the work function. © 2016 Elsevier B.V.
Original languageEnglish (US)
Pages (from-to)263-270
Number of pages8
JournalOrganic Electronics
StatePublished - Jul 14 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors wish to thank Dr. Stephen Barlow, Dr. Anthony Giordano, and Prof. Seth Marder for insightful discussions. This work is based on research supported in part by the Center for Interface Science: Solar-Electric Materials (CIS:SEM), an Energy Frontier Research Center funded through the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-SC0001084. We also acknowledge generous support from King Abdullah University of Science and Technology; we thank the IT Research Computing Team and Supercomputing Laboratory at KAUST for providing computational and storage resources. The computational resources at Georgia Tech are funded in part by the CRIF Program of the NSF under Award Number CHE-0946869.


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