AVS 56th International Symposium & Exhibition
    Electronic Materials and Processing Wednesday Sessions
       Session EM-WeM

Paper EM-WeM2
Perpendicular Interaction between Donor and Accepter Molecules on Au(111) Surface

Wednesday, November 11, 2009, 8:20 am, Room B1

Session: Organic & Molecular Electronics
Presenter: U.G.E. Perera, Ohio University
Authors: U.G.E. Perera, Ohio University
R. Mishima, Osaka University, Japan
S.-W. Hla, Ohio University
Correspondent: Click to Email
When two types of molecules having opposite tendency to donate and accept electrons are put together, charge transfer between the molecules can take place. Charge transfer alters the frontier molecular orbitals, and thus it can be used to engineer materials having a wide range of properties. Investigation of the charge transfer processes at a molecular level is a new avenue of exciting research. Here, we present a low temperature scanning tunneling microscopy (STM) and spectroscopy study of single molecule level charge transfer process between decamethylmanganocene (Mn(C5Me5) 2) and 7,7,8,8- tetracyanoquinodimethane (TCNQ) on a Au(111) surface at 4.6K. Both molecules are deposited onto an atomically clean Au (111) surface at an ultrahigh vacuum environment. On Au(111), the TCNQ molecules form well ordered two dimensional self-assembled clusters while the Mn(C5Me5)2 molecules adsorb either on TCNQ layer or on the bare surface areas. The STM images show that Mn(C5Me5)2 molecules position on the surface with tilted cyclopentacene rings. A comparative tunneling spectroscopy between the Mn(C5Me5)2 /Au(111) and Mn(C5Me5)2/TCNQ/Au(111) assemblies clearly reveals the shift of frontier molecular orbitals and thus the detailed charge transfer mechanism induced by deposition of Mn(C5Me5)2 has been able to explain. This research is supported by the United States Department of Energy BES grant number DE-FG02-02ER46012.