Unidirectional Real-Time Photoswitching of Diarylethene Molecular Monolayer Junctions with Multilayer Graphene Electrodes
Author(s):
Jeongmin Koo, Yeonsik Jang, Leoń Martin, Dongku Kim, Hyunhak Jeong, Keehoon Kang, Woocheol Lee, Junwoo Kim, Wang-Taek Hwang, Dong Xiang, Elke Scheer, Elke Scheer, Mikhail Kabdulov, Thomas Huhn, Fabian Pauly, Takhee Lee
Journal:
ACS Applied Materials & Interfaces
Year:
2019
Volume:
11
Pages
11645-11653
DOI:
10.1021/acsami.8b19372
Abstract:
We fabricate and characterize vertical molecular junctions consisting of self-assembled monolayers of diarylethene (DAE) contacted by a multilayer graphene (MLG) electrode on the top and gold on the bottom. The DAE molecular junctions show two stable electrical states, a closed state (high conductance) or an open state (low conductance), which are created upon illumination with UV or visible light, respectively. For the Au-DAE-MLG junction structure, we observe that the current levels between the two conductance states are separated by 2 orders of magnitude. However, in a real-time measurement, we observe only unidirectional switching behavior from the open to the closed state.