Molecular electronics & single molecule charge transport

We study charge transport at the single molecule level. In this project area, we aim to understand how charge (electrons/holes) is transported through conjugated organic molecules and redox-active groups. We use custom scanning tunneling microscope-break junction (STM-BJ) instruments, which enables direct measurement of molecular conductance in synthetic organic materials and biomaterials such as peptides and DNA. Understanding charge transport in single molecules is essential for designing new molecular electronic devices and for developing new materials for energy storage applications. Despite recent advances, our knowledge of molecular charge transport has been limited by challenges in precisely quantifying charge transport in single molecules, coupled with an inability to explore the vast chemical sequence space available for organic materials. Our work aims to understand molecular charge transport in new classes of materials for energy storage, capture, and transport applications.

Selected publications:
1. S. Li, H. Yu, X. Chen, A. A. Gewirth, J. S. Moore, C. M. Schroeder, “Covalent Ag-C Bonding Contacts from Unprotected Terminal Acetylenes for Molecular Junctions”, Nano Letters, 20, 5490 (2020).
2. H. Yu*, S. Li*, K. E. Schwieter, Y. Liu, B. Sun, J. S. Moore, C. M. Schroeder, “Charge Transport in Sequence-defined Conjugated Oligomers”,¬†Journal of the American Chemical Society, 142, 4852 (2020).
3. S. Li*, H. Yu*, K. E. Schwieter, K. Chen, B. Li, Y. Liu, J. S. Moore, C. M. Schroeder, “Charge Transport and Quantum Interference in Oxazole-Terminated Conjugated Oligomers”, Journal of the American Chemical Society, 141, 16079 (2019).
4. B. Li, H. Yu, E. C. Montoto, Y. Liu, S. Li, K. Schwieter, J. Rodriquez-Lopez, J. S. Moore, C. M. Schroeder, “Intrachain Charge Transport through Conjugated Donor-Acceptor Oligomers”, ACS Applied Electronic Materials, 1, 7 (2019).
5. S. Li, J. Li, H. Yu, S. Pudar, B. Li, J. Rodr√≠guez-Lopez, J. S. Moore, C. M. Schroeder, “Characterizing Intermolecular Interactions in Redox-active Pyridinium-based Molecular Junctions”, Journal of Electroanalytical Chemistry, (2020).