Being able to control and understanding electrical contact between
molecules and inorganic electrodes are critical for advancing
molecular electronics technology as well as measuring fundamental
molecular electrical transport. In this talk, I will show a new
method, nanotransfer printing (nTP), to fabricate top metal electrodes
in molecular diodes. nTP is capable of producing nanometer-size
features over centimeter-sized areas. Most importantly, nTP makes
molecular diodes without "shorting" between the two
electrodes with high yields. This conclusion is arrived by
quantitative analysis of current-voltage and photoelectric response
results. Capacitance-voltage measurements on nTP diodes reveal a
dipole layer associated with the molecular layer. The implication of
this dipole layer on the transport characteristics will be discussed.
Electronic structure calculations are performed to understand the
experimental results.