Heavily Doped Semiconductor Nanocrystal Quantum Dots
By David Mocatta, G. Cohen, Jonathan Schattner, O. Millo, E. Rabani, U. Banin. Science, 2011
697 citations recorded by the source corpus.
Impurities can be added into semiconductor nanoparticles to control their electronic and optical properties. 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.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/440cd447c6eb95a98a33bae737f7d14fe8fbb61d
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In Electrical and Electronic Engineering
Citations in the corpus
- Efficient Blue and White Perovskite Light-Emitting Diodes via Manganese Doping (2018, background): “Typically, one would expect a larger Urbach energy as dopants are added and contribute to the tail absorption.(29) With these materials, however, we observe a roughly constant or even slightly reduced Urbach energy, with the undoped control giving 17.”
- Prospects of nanoscience with nanocrystals. (2015, neutral): “Another limitation was that an intraband infrared photoresponse requires the precise filling of intraband states, but controlled doping in colloidal quantum dots has remained difficult.(406)”