Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3088861
Keywords
cadmium compounds; dyes; energy gap; II-VI semiconductors; infrared spectra; monolayers; nanoparticles; optical constants; scanning tunnelling microscopy; semiconductor quantum dots; ultraviolet spectra; wide band gap semiconductors
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Funding
- Ramanna Fellowship [SR/S2/RFCMP-02/2005]
- CSIR-NET Fellowship [09/080(0504)/2006-EMR-I, 503982]
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We show that transport gap of semiconducting nanoparticles can be changed without disturbing the optical gap. This is achieved through inorganic-organic hybrid core-shell approach. Different inorganic nanoparticles with a bandgap in the UV to NIR range are used as the core; as a shell to the nanoparticles, a monolayer of different organic molecules is used. With the inclusion of the shell layer, optical gap of the nanoparticles does not change. Transport gap, as obtained from current-voltage characteristics of a single nanoparticle with scanning tunneling microscope tip, changes to that of the shell-material irrespective of the bandgap of core nanoparticles.
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