期刊
NANO LETTERS
卷 17, 期 9, 页码 5238-5243出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01348
关键词
2D superstructure; self-assembly; oriented attachment; electrolyte gating; optoelectrical characterization
类别
资金
- H-MSCA-ITN Program Phonsi, (Nanophotonics by nano crystals, from integration to single photon operation)
- Dutch FOM programme Designing Dirac carriers in honeycomb semiconductor superlattices (FOM Program) [152]
- European Research Council, ERC [692691]
- European Research Council (ERC) [692691] Funding Source: European Research Council (ERC)
Self-assembled nanocrystal solids show promise as a versatile platform for novel optoelectronic materials. Superlattices composed of a single layer of lead chalcogenide and cadmium chalcogenide nanocrystals with epitaxial connections between the nanocrystals, present outstanding questions to the community regarding their predicted band structure and electronic transport properties. However, the as prepared materials are intrinsic semiconductors; to occupy the bands in a controlled way, chemical doping or external gating is required. Here, we show that square superlattices of PbSe nanocrystals can be incorporated as a nanocrystal monolayer in a transistor setup with an electrolyte gate. The electron (and hole) density can be controlled by the gate potential, up to 8 electrons per nanocrystal site. The electron mobility at room temperature is 18 cm(2)/(Vs). Our work forms a first step in the investigation of the band structure and electronic transport properties of two-dimensional nanocrystal superlattices with controlled geometry, chemical composition, and carrier density.
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