Project

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Electronic Impurity Doping of Semiconductor Nanocrystals

English title Electronic Impurity Doping of Semiconductor Nanocrystals
Applicant Norris David J.
Number 140617
Funding scheme Project funding (Div. I-III)
Research institution Institut für Verfahrenstechnik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Material Sciences
Start/End 01.05.2012 - 30.04.2015
Approved amount 532'409.00
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All Disciplines (2)

Discipline
Material Sciences
Physical Chemistry

Keywords (10)

nanomaterials; nanotechnology; semiconductor nanocrystals; doping; solar cells; light emitting diodes; optical materials; fluorescence; thin film transistors; quantum dots

Lay Summary (English)

Lead
Lay summary

This project will study nanometer-scale semiconductor particles, or nanocrystals, in which electronically active impurity atoms (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 such applications are trying to utilize thin films of densely-packed nanocrystals, and electronically active impurities can enhance the conductivity of these films.

After several decades of effort, a few groups 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.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Photocatalytic Water-Splitting Enhancement by Sub-Bandgap Photon Harvesting
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.
Ripening of Semiconductor Nanoplatelets
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.
An intrinsic growth instability in isotropic materials leads to quasi-two-dimensional nanoplatelets
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.
Charge Trapping Defects in CdSe Nanocrystal Quantum Dots
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.
Substrate Selection for Full Exploitation of Organic Semiconductor Films: Epitaxial Rubrene on β-Alanine Single Crystals
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.
Localization of Ag Dopant Atoms in CdSe Nanocrystals by Reverse Monte Carlo Analysis of EXAFS Spectra
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.
Plasmonic Films Can Easily Be Better: Rules and Recipes
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.
Broadband Up-Conversion at Subsolar Irradiance: Triplet Triplet Annihilation Boosted by Fluorescent Semiconductor Nanocrystals
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.
Microscopic Theory of Cation Exchange in CdSe Nanocrystals
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.
Solid-Phase Flexibility in Ag2Se Nanocrystals
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.
Imaging Impurities in Semiconductor Nanostructures
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.
Influence of Silver Doping on Electron Transport in Thin Films of PbSe Nanocrystals
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.

Collaboration

Group / person Country
Types of collaboration
University of Duisburg-Essen Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Naval Research Laboratory (NRL) United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Milano Bicocca Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
University of Pennsylvania United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
TU München Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
University of Minnesota United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
2015 Spring Meeting of the Materials Research Society (MRS) Talk given at a conference Microscopic mechanism of cation exchange in II-VI nanocrystals 05.04.2015 San Francisco, United States of America Ott Florian;
27th Workshop on Quantum Solar Energy Conversion (Quantsol 2015) Talk given at a conference Photon energy conversion with semiconductor nanocrystals 22.03.2015 Rauris, Austria Norris David J.;
Gordon Research Conference on Nanomaterials for Applications in Energy Technology Talk given at a conference Photon energy conversion with semiconductor nanocrystals 22.02.2015 Ventura Beach, CA, United States of America Norris David J.;
2014 Fall Meeting of the Materials Research Society (MRS) Talk given at a conference Efficient charge transport through weakly-coupled CdSe nanocrystals 30.11.2014 Boston, United States of America Braga Daniele; Norris David J.;
3rd International Symposium on Disperse Systems for Electronic Applications Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 11.09.2014 Erlangen, Germany Norris David J.;
International Conference on Fundamental Processes in Semiconductor Nanocrystals Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 07.09.2014 Oxford, Great Britain and Northern Ireland Norris David J.;
Seminar at the Inorganic Chemistry Department, Humboldt University Individual talk Electronic impurity doping of colloidal semiconductor nanocrystals 11.06.2014 Berlin, Germany Norris David J.;
30th Anniversary of the Discovery of Colloidal Quantum Dots Conference Talk given at a conference The history of nanocrystal doping 26.05.2014 Paris, France Norris David J.;
Quantum Dot 2014 Conference (QD2014) Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 11.05.2014 Pisa, Italy Norris David J.;
Quantum Dot 2014 Conference (QD2014) Poster Charge transport in weakly-coupled CdSe nanocrystals 11.05.2014 Pisa, Italy Norris David J.; Braga Daniele;
2014 Spring Meeting of the Materials Research Society (MRS) Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 04.05.2014 San Francisco, CA, United States of America Norris David J.;
2014 Spring Meeting of the Materials Research Society (MRS) Talk given at a conference Microscopic theory of cation exchange in semiconductor nanocrystals 04.05.2014 San Francisco, CA, United States of America Ott Florian;
Gordon Research Conference on Clusters, Nanocrystals, and Nanostructures Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 04.08.2013 South Hadley, MA , United States of America Norris David J.;
Gordon Research Conference on Clusters, Nanocrystals, and Nanostructures Poster Theory of nanocrystal doping by arrested cation exchange 04.08.2013 South Hadley, MA, United States of America Ott Florian;
Seminar at the Department of Chemistry at the University of Hamburg Individual talk Electronic impurity doping of colloidal semiconductor nanocrystals 25.06.2013 Hamburg, Germany Norris David J.;
Workshop on Electron Transport in Nanocrystal Assemblies (ETNCA) Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 14.06.2013 Minneapolis, MN, United States of America Norris David J.;
2013 Spring Meeting of the Materials Research Society Poster Phase transitions in silver chalcogenides nanocrystals 01.04.2013 San Francisco, CA, United States of America Norris David J.; Braga Daniele;
Spring Meeting of the European Materials Research Society Talk given at a conference Electronic Impurity Doping of Colloidal Semiconductor Nanocrystals 31.03.2013 Strasbourg, France, France Norris David J.;
Seminar at the Department of Physics, Cambridge University Individual talk Electronic impurity doping of colloidal semiconductor nanocrystals 07.12.2012 Cambridge, England UK, Great Britain and Northern Ireland Norris David J.;
Materials Colloquium at the US Naval Research Laboratory Individual talk Electronic impurity doping of colloidal semiconductor nanocrystals 19.11.2012 Wasington DC, USA, United States of America Norris David J.;
Fall Meeting of the American Chemical Society Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 19.08.2012 Philadelphia, USA, United States of America Norris David J.;
Gordon Research Conference on Defects in Semiconductors Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 12.08.2012 Biddeford, Maine, USA, United States of America Norris David J.;
International Workshop on Ordered and Non-Ordered Superstructures of Nanosized Objects Talk given at a conference Electronic impurity doping of colloidal semiconductor nanocrystals 09.07.2012 Dresden Germany, Germany Norris David J.;


Associated projects

Number Title Start Funding scheme
188593 Towards Monodisperse Colloidal Semiconductor Nanocrystals 01.11.2019 Project funding (Div. I-III)
159228 Electronic Impurity Doping of Semiconductor Nanocrystals II 01.05.2015 Project funding (Div. I-III)

Abstract

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.
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