Science (American Association for the Advancement of Science), 2011-04, Vol.332 (6025), p.77-81
2011
Details
- Autor(en) / Beteiligte
- Titel
- Heavily Doped Semiconductor Nanocrystal Quantum Dots
- Ist Teil von
- Science (American Association for the Advancement of Science), 2011-04, Vol.332 (6025), p.77-81
- Ort / Verlag
- Washington, DC: American Association for the Advancement of Science
- Erscheinungsjahr
- 2011
- Link zum Volltext
- Quelle
- American Association for the Advancement of Science
- Beschreibungen/Notizen
- Doping of semiconductors by impurity atoms enabled their widespread technological application in microelectronics and optoelectronics. However, doping has proven elusive for strongly confined colloidal semiconductor nanocrystals because of the synthetic challenge of how to introduce single impurities, as well as a lack of fundamental understanding of this heavily doped limit under strong quantum confinement. We developed a method to dope semiconductor nanocrystals with metal impurities, enabling control of the band gap and Fermi energy. A combination of optical measurements, scanning tunneling spectroscopy, and theory revealed the emergence of a confined impurity band and band-tailing. Our method yields n- and p-doped semiconductor nanocrystals, which have potential applications in solar cells, thin-film transistors, and optoelectronic devices.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0036-8075eISSN: 1095-9203DOI: 10.1126/science.1196321Titel-ID: cdi_proquest_miscellaneous_859761000
- Format
- –
- Schlagworte
- Atoms, Band spectra, Band theory, Blue shift, Condensed matter: electronic structure, electrical, magnetic, and optical properties, Condensed matter: structure, mechanical and thermal properties, Conduction bands, Defects and impurities in crystals, microstructure, Doping, Doping and impurity implantation in iii-v and ii-vi semiconductors, Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures, Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals, Electrons, Exact sciences and technology, Fermi surfaces, Impurities, Lead, Nanocrystals, Nanocrystals and nanoparticles, Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation, Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures, Physics, Quantum confinement, Qunatum dots, Red shift, Semiconductors, Structure of solids and liquids, crystallography