期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 22, 页码 8122-8130出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja503533y
关键词
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资金
- Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
- Shanghai Municipal Science and Technology Commission [12nm0504000]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [2013-57]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) [IRT1269]
- Department of Energy [ER46673 DE-SC0001928]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1321405] Funding Source: National Science Foundation
We describe the design and synthesis of a new graphene ribbon architecture that consists of perylenediimide (PDI) subunits fused together by ethylene bridges. We created a prototype series of oligomers consisting of the dimer, trimer, and tetramer. The steric congestion at the fusion point between the PDI units creates helical junctions, and longer oligomers form helical ribbons. Thin films of these oligomers form the active layer in n-type field effect transistors. UV-vis spectroscopy reveals the emergence of an intense long-wavelength transition in the tetramer. From DFT calculations, we find that the HOMO-2 to LUMO transition is isoenergetic with the HOMO to LUMO transition in the tetramer. We probe these transitions directly using femtosecond transient absorption spectroscopy. The HOMO-2 to LUMO transition electronically connects the PDI subunits with the ethylene bridges, and its energy depends on the length of the oligomer.
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