TY - JOUR
T1 - Odd-Even Effect in Molecular Electronic Transport via an Aromatic Ring
AU - Toledano, Tal
AU - Sazan, Haim
AU - Mukhopadhyay, Sabyasachi
AU - Alon, Hadas
AU - Lerman, Keti
AU - Bendikov, Tatyana
AU - Major, Dan T.
AU - Sukenik, Chaim N.
AU - Vilan, Ayelet
AU - Cahen, David
N1 - Israel Science Foundation, ISF, through its Centre of Excellence programs; Kimmel Centre for Nanoscale Science; GMJ Schmidt Minerva Centre for Supramolecular ArchitectureWe thank Sidney Cohen for helpful discussions, Lee Barnea Nehoshtan, Nir Klein Kedem, and Tatiana Peixoto for help and advice, the Israel Science Foundation, ISF, through its Centre of Excellence programs (D.C. and C.N.S.), the Kimmel Centre for Nanoscale Science (D.C.), and the GMJ Schmidt Minerva Centre for Supramolecular Architecture (D.C.) for partial support. This work was made possible, in part, by the historic generosity of the Harold Perlman family. D.C. holds the Sylvia and Rowland Schaefer Chair in Energy Research.
PY - 2014/11/18
Y1 - 2014/11/18
N2 - A distinct odd even effect on the electrical properties, induced by monolayers of alkyl-phenyl molecules directly bound to Si(111), is reported. Monomers of H2C=CH- Even (CH2) phenyl, with n = 2-5, were adsorbed onto Si I-I and formed high-quality monolayers with a binding density of 50-60% Si(111) surface atoms. Molecular dynamics simulations suggest that the binding proximity is close enough to allow efficient /r,r interactions and therefore distinctly different packing and ring orientations for monomers with odd or even numbers of rnethylenes in their alkyl spacers. The odd even alternation in molecular tilt was experimentally confirmed by con. tact ellipsometry, and XPS with a close quantitative matc,t to the simulation results. The orientation. an even s of bot h ring ng p ane and the long axis f the alkyl spacer are more perpendicular pi-pi the with substrate lane for molecules number of niethylenes than for those with an odd number ofi7rriethilYlenesd. with Interestingly! those th an even number conduct better than the effectively thinner mono.laYers Of the Plialeatrin_s le with respect odd number of inethylenes. We attribute this to a change in the orientation of the electron density,on the aromatic to the shortest tunneling path, which increases the harrier for electron transport through the Odd monolaye,rsof,The hig h sensitivity of molecular charge transport o orientation t the oentation of an aromatic moiety might be relevant to better control over th electronic properties of interfaces n organic electronics.
AB - A distinct odd even effect on the electrical properties, induced by monolayers of alkyl-phenyl molecules directly bound to Si(111), is reported. Monomers of H2C=CH- Even (CH2) phenyl, with n = 2-5, were adsorbed onto Si I-I and formed high-quality monolayers with a binding density of 50-60% Si(111) surface atoms. Molecular dynamics simulations suggest that the binding proximity is close enough to allow efficient /r,r interactions and therefore distinctly different packing and ring orientations for monomers with odd or even numbers of rnethylenes in their alkyl spacers. The odd even alternation in molecular tilt was experimentally confirmed by con. tact ellipsometry, and XPS with a close quantitative matc,t to the simulation results. The orientation. an even s of bot h ring ng p ane and the long axis f the alkyl spacer are more perpendicular pi-pi the with substrate lane for molecules number of niethylenes than for those with an odd number ofi7rriethilYlenesd. with Interestingly! those th an even number conduct better than the effectively thinner mono.laYers Of the Plialeatrin_s le with respect odd number of inethylenes. We attribute this to a change in the orientation of the electron density,on the aromatic to the shortest tunneling path, which increases the harrier for electron transport through the Odd monolaye,rsof,The hig h sensitivity of molecular charge transport o orientation t the oentation of an aromatic moiety might be relevant to better control over th electronic properties of interfaces n organic electronics.
UR - http://www.scopus.com/inward/record.url?scp=84910622539&partnerID=8YFLogxK
U2 - https://doi.org/10.1021/la503536f
DO - https://doi.org/10.1021/la503536f
M3 - مقالة
C2 - 25338192
SN - 0743-7463
VL - 30
SP - 13596
EP - 13605
JO - Langmuir
JF - Langmuir
IS - 45
ER -