期刊
NANO LETTERS
卷 12, 期 6, 页码 3018-3024出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3008049
关键词
Graphene; C-60 Sic; scanning tunneling spectroscopy; STM; photovoltaic; charge transfer
类别
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under SISGR [DE-FG02-09ER16109, DE-AC02-06CH11357]
- DARPA [MIPR 10-E533]
We have investigated the initial stages of growth and the electronic structure of C-60 molecules on graphene grown epitaxially on SiC(0001) at the single molecule level using cryogenic ultrahigh vacuum scanning tunneling microscopy and spectroscopy. We observe that the first layer of C-60 molecules self-assembles into a well-ordered, close-packed arrangement on graphene upon molecular deposition at room temperature while exhibiting a subtle C-60 superlattice. We measure a highest occupied molecular orbital-lowest unoccupied molecular orbital gap of similar to 3.S eV for the C-60 molecules on graphene in submonolayer regime, indicating a significantly smaller amount of charge transfer from the graphene to C-60 and substrate-induced screening as compared to C-60 adsorbed on metallic substrates. Our results have important implications for the use of graphene device applications that require electronic decoupling between functional molecular adsorbates and substrates.
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