Molecular electronics enables miniaturization of the molecular devices that has essential applications in nanosized electronics circuits, and offered opportunity to study fundamentals of charge transport mechanisms in molecular scale. In molecular junctions two transport mechanisms that broadly studied are, tunneling and hopping. Tunneling mechanism is the mechanism where electron coherently tunnel through energy offset of a molecule. It has been observed that the coherent tunneling depends on the interaction between the molecule and the contact electrode, as well as energy offset between the Fermi energy level of the electrode and the molecule orbital (sometimes also referred as tunneling barrier though not very accurate). Tunneling mechanism can be modelled based on various suppositions, while the most commonly used is single level model (SLM) in both experimental and theoretical studies. In this model, single electroactive state is sandwiched between two electrodes with energy level offset to the Fermi level of the electrodes and electronic coupling to the electronic states of the electrode (figure ). Experimentally single state junction has been achieved by attaching electroactive group like ferrocene or conjugate organic molecules as the single electronic active state with alkane molecule as insert molecular linker to adjust the coupling of the electronic state with electrode. Function and special transport behaviors have been observed like, rectification , Coulomb blockade and Kondo effect through utilization of experimental techniques such as scanning tunneling microscope (STM), mechanical controllable break junctions (MC-BJ) , conducting probe atomic force microscope (CP-AFM) and liquid junction techniques like eutectic indium gallium (EGaIn) or mercury drop junctions . Theoretical analysis based on SLM depends on the mathematical modeling of the experimental I-V plot where coupling strength (Γ) and energy offset (ε0) can be obtained and cross compared to spectroscopy measurement like ultraviolet photoelectron spectroscopy (UPS) or ab initio calculation The currentvoltage (I-V) relation in single level model is described by Landauer formula (Eq 1) with single level transmission function (1.