Controlling the electronic and physical coupling on dielectric thin films
Technology
T
Chemical technology
Science
Physics
QC1-999
organic films
thin dielectric film
Q
TP1-1185
02 engineering and technology
01 natural sciences
Full Research Paper
para-sexiphenyl
620
decoupling
0103 physical sciences
0210 nano-technology
integer charge transfer
info:eu-repo/classification/ddc/620
DOI:
10.3762/bjnano.11.132
Publication Date:
2020-10-01T13:24:44Z
AUTHORS (13)
ABSTRACT
Ultrathin dielectric/insulating films on metals are often used as decoupling layers to allow for the study of the electronic properties of adsorbed molecules without electronic interference from the underlying metal substrate. However, the presence of such decoupling layers may effectively change the electron donating properties of the substrate, for example, by lowering its work function and thus enhancing the charging of the molecular adsorbate layer through electron tunneling. Here, an experimental study of the charging of para-sexiphenyl (6P) on ultrathin MgO(100) films supported on Ag(100) is reported. By deliberately changing the work function of the MgO(100)/Ag(100) system, it is shown that the charge transfer (electronic coupling) into the 6P molecules can be controlled, and 6P monolayers with uncharged molecules (Schottky–Mott regime) and charged and uncharged molecules (Fermi level pinning regime) can be obtained. Furthermore, it was found that charge transfer and temperature strongly influence the orientation, conformation, and wetting behavior (physical coupling) of the 6P layers on the MgO(100) thin films.
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