title: Tuning energetic levels in nanocrystal quantum dots through surface manipulations.
abstract: We demonstrate tuning of the electronic level positions with respect to the vacuum level in colloidal InAs nanocrystals using surface ligand exchange. Electrochemical as well as scanning tunneling spectroscopy measurements reveal that the tuning is largely dependent on the nanocrystal size and the surface linking group, while the polarity of the ligand molecules has a lesser effect. The implications of affecting the electronic system of nanocrystal through its capping are illustrated through prototype devices.
authors.affiliation: The Zisapel Nano-electronics center, Department of Electrical Engineering, Technion--Israel Institute of Technology, Technion City, Haifa 32000, Israel.
authors.forename: Michal
authors.initials: M
authors.lastname: Soreni-Harari
authors.forename: Nir
authors.initials: N
authors.lastname: Yaacobi-Gross
authors.forename: Dov
authors.initials: D
authors.lastname: Steiner
authors.forename: Assaf
authors.initials: A
authors.lastname: Aharoni
authors.forename: Uri
authors.initials: U
authors.lastname: Banin
authors.forename: Oded
authors.initials: O
authors.lastname: Millo
authors.forename: Nir
authors.initials: N
authors.lastname: Tessler
mesh_terms: D003460:Crystallization / Q000379:methods*; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D010316:Particle Size; D045663:Quantum Dots; D013499:Surface Properties