| Autor: |
Kang H; Department of Chemistry, Korea University, Seoul 02841, Korea., Kong GD; Department of Chemistry, Korea University, Seoul 02841, Korea., Byeon SE; Department of Chemistry, Korea University, Seoul 02841, Korea., Yang S; Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea., Kim JW; Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea., Yoon HJ; Department of Chemistry, Korea University, Seoul 02841, Korea. |
| Abstrakt: |
This Letter examines the interplay of important tunneling mechanisms-Fermi level pinning, Marcus inverted transport, and orbital gating-in a molecular rectifier. The temperature dependence of the rectifying molecular junction containing 2,2'-bipyridyl terminated n -alkanethiolate was investigated. A bell-shaped trend of activation energy as a function of applied bias evidenced the dominant occurrence of unusual Marcus inverted transport, while retention of rectification at low temperatures implied that the rectification obeyed the resonant tunneling regime. The results allowed reconciling two separately developed transport models, Marcus-Landauer energetics and Fermi level pinning-based rectification. Our work shows that the internal orbital gating can be substituted with the pinning effect, which pushes the transport mechanism into the Marcus inverted regime. |
