nanomaterials; nanotechnology; semiconductor nanocrystals; doping; solar cells; light emitting diodes; optical materials; fluorescence; thin film transistors; quantum dots
Monguzzi Angelo, Oertel Amadeus, Braga Daniele, Riedinger Andreas, Kim David K., Knüsel Philippe N., Bianchi Alberto, Mauri Michele, Simonutti Roberto, Norris David J., Meinardi Francesco (2017), Photocatalytic Water-Splitting Enhancement by Sub-Bandgap Photon Harvesting, in ACS Applied Materials & Interfaces
, 9(46), 40180-40186.
Ott Florian D., Riedinger Andreas, Ochsenbein David R., Knüsel Philippe N., Erwin Steven C., Mazzotti Marco, Norris David J. (2017), Ripening of Semiconductor Nanoplatelets, in Nano Letters
, 17(11), 6870-6877.
Riedinger Andreas, Ott Florian D., Mule Aniket, Mazzotti Sergio, Knüsel Philippe N., Kress Stephan J. P., Prins Ferry, Erwin Steven C., Norris David J. (2017), An intrinsic growth instability in isotropic materials leads to quasi-two-dimensional nanoplatelets, in Nature Materials
, 16(7), 743-748.
Almeida António J., Sahu Ayaskanta, Riedinger Andreas, Norris David J., Brandt Martin S., Stutzmann Martin, Pereira Rui N. (2016), Charge Trapping Defects in CdSe Nanocrystal Quantum Dots, in The Journal of Physical Chemistry C
, 120(25), 13763-13770.
Trabattoni Silvia, Raimondo Luisa, Campione Marcello, Braga Daniele, Holmberg Vincent C., Norris David J., Moret Massimo, Ciavatti Andrea, Fraboni Beatrice, Sassella Adele (2015), Substrate Selection for Full Exploitation of Organic Semiconductor Films: Epitaxial Rubrene on β-Alanine Single Crystals, in Advanced Materials Interfaces
, 2(18), 1500423-1500423.
Kompch Alexander, Sahu Ayaskanta, Notthoff Christian, Ott Florian, Norris David J., Winterer Markus (2015), Localization of Ag Dopant Atoms in CdSe Nanocrystals by Reverse Monte Carlo Analysis of EXAFS Spectra, in The Journal of Physical Chemistry C
, 119(32), 18762-18772.
McPeak Kevin M., Jayanti Sriharsha V., Kress Stephan J. P., Meyer Stefan, Iotti Stelio, Rossinelli Aurelio, Norris David J. (2015), Plasmonic Films Can Easily Be Better: Rules and Recipes, in ACS Photonics
, 2(3), 326-333.
Monguzzi A., Braga D., Gandini M., Holmberg V. C., Kim D. K., Sahu A., Norris D. J., Meinardi F. (2014), Broadband Up-Conversion at Subsolar Irradiance: Triplet Triplet Annihilation Boosted by Fluorescent Semiconductor Nanocrystals, in NANO LETTERS
, 14(11), 6644-6650.
Ott Florian D., Spiegel Leo L., Norris David J., Erwin Steven C. (2014), Microscopic Theory of Cation Exchange in CdSe Nanocrystals, in PHYSICAL REVIEW LETTERS
, 113(15), 156803.
Sahu Ayaskanta, Braga Daniele, Waser Oliver, Kang Moon Sung, Deng Donna, Norris David J. (2014), Solid-Phase Flexibility in Ag2Se Nanocrystals, in Nano Letters
, 14, 115-121.
Holmberg Vincent C., Helps Justin R., Mkhoyan K. Andre, Norris David J. (2013), Imaging Impurities in Semiconductor Nanostructures, in Chemistry of Materials
, 25(8), 1332-1350.
Kang Moon Sung, Sahu Ayaskanta, Frisbie C. Daniel, Norris David J. (2013), Influence of Silver Doping on Electron Transport in Thin Films of PbSe Nanocrystals, in Advanced Materials
, 25(5), 725-731.
This project will study nanometer-scale semiconductor particles, or nanocrystals, in which electronically active impurities (or dopants) have been incorporated. Even without such dopants, semiconductor nanocrystals, also known as colloidal quantum dots, can exhibit unique and potentially useful properties due to their small size. The addition of impurities to such particles is of interest for three reasons. First, the critical role that dopants play in semiconductor devices, such as the transistor, provides a strong motivation to study doped semiconductor nanocrystals. Second, impurities in nanocrystals should exhibit even more dramatic behavior than in bulk semiconductors because the dopants are confined in extremely small volumes. Finally, doping can help address key problems in potential applications of nanocrystals (e.g., light-emitting diodes and solar cells). In particular, many applications utilize thin films of densely-packed nanocrystals, and electronically active impurities can provide extra electrical carriers, i.e. electrons or holes, to the particles that enhance the conductivity of these films.After several decades of effort, a few groups (including the applicant’s) have very recently demonstrated the first examples of colloidal nanocrystals with electronically active impurities. In this project, two Ph.D. students and one postdoctoral researcher will investigate these materials. The team will also work with four external collaborators to leverage SNF funding. The main goal of the research will be to understand the fundamental properties of doped nanocrystals. To achieve this, the project team will (i) collect data on their optical, electrical, and structural properties and (ii) generate theoretical models from detailed calculations of dopant energetics. During the project, the team will also continue to develop new doped materials. In addition to training two Ph.D students and a postdoctoral researcher, the expected outcome of the project is an understanding of the fundamental properties of doped nanocrystals and how they can impact nanocrystal devices and applications. Early experiments have already shown interesting and unexpected behavior, and further surprises are expected.