Speakers

Functional Nanocrystal Solids: A Modular Approach to Materials Design

Dmitri Talapin
Dmitri Talapin
Department of Chemistry, University of Chicago, USA
13:20~14:10,November 22nd, 2013

Abstract:

Colloidal nanocrystals can combine the advantages of crystalline inorganic semiconductors with the size-tunable electronic structure and inexpensive solution-based device fabrication[1]. Single-and multicomponent nanocrystal assemblies, also known as superlattices, provide a powerful general platform for designing two-and three-dimensional solids with tailored electronic, magnetic, and optical properties. Unlike atomic and molecular crystals where atoms, lattice geometry, and interatomic distances are fixed entities, the nanocrystal arrays represent ensembles of “designer atoms” with potential for tuning their electronic structure and transport properties.

The ability to assemble precisely engineered nanoscale building blocks into complex structures is opening the door to materials where components and functionalities can be added, tuned or combined in a predictable manner. I will show howself-assembly of nanocrystals can lead to a palette of unprecedented phases including superlattices isostructural with Archimedean tilings and dodecagonal quasicrystals[2].

Efficient charge transport is crucial for performance of nanocrystal-based electronic and optoelectronic devices. Many practical implementations of nanocrystals are hindered by the poor electroniccoupling in close-packed nanocrystal films, caused by the presence of bulky organic surface ligands.To address this fundamental problem, we introduced inorganic surface ligands, such as molecular metal chalcogenide complexes Sn2S64-, In2Se42- [3,4], etc as well as metal-free inorganic ligands like S2-, Se2-, Te2-[5].These new approaches to surface termination of colloidal nanomaterials provide a set of advantages such as all-inorganic design and diverse compositional tunability. I will demonstrate the power of this approach on several examples of prospective electronic, thermoelectric and photovoltaic materials.

 

References:

[1] Talapin D V, Lee J -S, Kovalenko M V and Shevchenko E V Chem. Rev. 110, 389 (2010)

[2] Talapin D V, Shevchenko, E V, Bodnarchuk, M I, Ye X, Chen J and Murray C B Nature 461, 964 (2009)

[3] Kovalenko M V, Scheele M and Talapin D V. Science 324, 1417 (2009)

[4] Lee J -S, Kovalenko M V, Huang J and Talapin D V Nature Nanotech 6, 348 (2011)

[5] Nag A, Kovalenko M V, Lee J -S, Liu W, Spokoyny B and Talapin D V J. Am. Chem. Soc. 133, 10612 (2011)

 

Research Interests:

 

Professional Experience

  • 2013 – Professor, Department of Chemistry, University of Chicago
  • 2011-2013 Associate Professor, Department of Chemistry, University of Chicago
  • 2007-2011 Assistant Professor, Department of Chemistry, University of Chicago
  • 2005-2007 Staff Scientist, The Molecular Foundry, LawrenceBerkeley National Laboratory
  • 2003-2005 Postdoctoral Fellow, IBM T.J. Watson Research Center, Yorktown Heights, NY, with Christopher B. Murray

 

Publication, Patents and Invited Talks

Over 150 publications in refereed journals and edited books cited more than 12500 times with h-factor 52. 8 patents and filed patent applications. More than 50 invited talks at international conferences and workshops.

 

Service to Scientific community

 

Organizing Research Symposia: “Nanophotonic Materials”, SPIE (San Diego, 2008) “Low-Cost Solution-Based Deposition of Inorganic Materials for Electronic/Photonic Devices” 2008 Fall MRS (Boston); “New developments in energy conversion and light-harvesting” 237th ACS National Meeting (Salt Lake City, 2009); “Nanocrystals as Precursors for Complex Structures through Self-Assembly and Chemical Transformations” 2009 Spring MRS (San Francisco); “Transport in Nanoengineered Materials“ 2010 (Chicago); ONSNO12 (Dresden, 2012).

Editorial Board Member of Nanoscale published by the Royal Society of Chemistry

Invited editor for special issue of the Journal of Materials Chemistry „Chemical Transformations in Nanoparticles“, Chemical Society Reviews “Chemistry of Functional Nanomaterials“ and MRS Bulletin „Quantum Dot Light Emitting Devices

Awards and Honors:

  • Materials Research Society Outstanding Young Investigator Award (2011)
  • Top 100 chemists (#21) of the past decade based on citation impact by Thompson Reuters (2011) Camille Dreyfus Teacher-Scholar Award (2010)
  • The David and Lucile Packard Fellowship (2009)
  • Sloan Fellowship (2009)
  • NSF CAREER Award (2008)
  • LMUexcellentFellowship, Germany (2007)
  • IBM Invention Achievement Award (2004, 2006)
  • Belarus National Academy of Sciences Award (1995); International Soros Foundation Fellowship (1994); 1stPrize of the USSR Chemistry Olympiad (1991)