| Title | Control of Unipolar/Ambipolar Transport in Single-Molecule Transistors through Interface Engineering |
| Authors | Xin, Na Kong, Xianghua Zhang, Yu-Peng Jia, Chuancheng Liu, Lei Gong, Yao Zhang, Weining Wang, Shuopei Zhang, Guangyu Zhang, Hao-Li Guo, Hong Guo, Xuefeng |
| Affiliation | Peking Univ, Coll Chem & Mol Engn, State Key Lab Struct Chem Unstable & Stable Speci, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China McGill Univ, Ctr Phys Mat, Montreal, PQ H3A 2T8, Canada McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada Lanzhou Univ, Coll Chem & Chem Engn, Key Lab Special Funct Mat & Struct Design, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China Nanoacad Technol Inc, Suite 802,666 Rue Sherbrooke West, Montreal, PQ H3A 1E7, Canada Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China |
| Keywords | CONDUCTANCE ELECTRONICS JUNCTIONS GRAPHENE |
| Issue Date | Apr-2020 |
| Publisher | ADVANCED ELECTRONIC MATERIALS |
| Abstract | To realize single-molecule field-effect transistors, a crucial test for evaluating the integrity of single-molecule electronics into conventional circuit architectures, remains elusive. Though interfacial effect is widely accepted to be crucially important in electronic devices, rare reports have studied fine control of the interface in single-molecule transistors. Through molecular engineering, different numbers of methylene groups are incorporated between the diketopyrrolopyrrole (DPP) kernel and anchor groups (AMn-DPP, n = 0-3), and how the molecule-electrode interface affects the performance of single-molecule transistors is investigated. Both experimental and theoretical data demonstrate that p-type charge transport dominates in AM0-DPP and AM1-DPP single-molecule transistors, while AM2-DPP and AM3-DPP systems exhibit ambipolar field-effect behaviors, which is attributed to the HOMO-pinning effect in AM0-DPP and AM1-DPP molecular junctions. Theoretical calculations show that the parity of the methylene number results in two different connection symmetries between the DPP kernel and graphene electrodes, and thus different electronic interactions, leading to different relative molecular energy-level alignments form those of isolated molecules, which has never been reported before. These results provide crucial information for precise control of the interfaces in molecular junctions, new insight into building multifunctional graphene-organic hybrid electronic devices, and the design of functional organic materials. |
| URI | http://hdl.handle.net/20.500.11897/606649 |
| ISSN | 2199-160X |
| DOI | 10.1002/aelm.201901237 |
| Indexed | SCI(E) EI |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ |
