The tunneling transport through SLM can be describe by Landauer-Büttiker formalism (Eq 1) which shows relation of current with transmission probability (Tr) that depends on energy offset and the coupling strength between electrodes and molecule. In the simulation, we consider the energy offsets of 1 eV, 0.5 eV and 0.1 eV, while coupling was set to be 100 meV, 10 meV, 5 meV and 1 meV. These values were chosen based on experimental results reported in literatures. The quantum conductance was2e 2 / ℎ = 77.4 μS , and voltage division factor (γ) was 0.5, i.e. symmetric situation. The bias range for the simulation is 1.5 V in both positive and negative polarities.