Directory

Gregory Szulczewski

Gregory Szulczewski

Associate Professor

Education

  • Postdoctoral Associate, University of Texas, 1995-1997
  • PhD, Wayne State University, 1995
  • BS, University of Michigan, 1989

Bio

Research Interests

Energy, thermoelectrics, and charge and spin transport across molecular interfaces

Research in our group is focused on the growth, modification and characterization of surfaces and interfaces for applications in energy conversion, photocatalysis, chemical sensors and molecular spintronics. Students in my group us a variety of surface analysis techniques including scanning probe microscopy, electron microscopy and photoelectron spectroscopy and perform electrical transport measurements. Below is a description of some of the current projects in the group.

Molecular electronics and spintronics

Organic semiconductors can absorb/emit light and transport charge. As a result, a multitude of functional devices, e.g. solar cells, transistors, and light-emitting displays can be fabricated. To expand on the versatility of molecular materials, there has been an effort to manipulate the spin degree of freedom of the electrical carriers. Our goal is to measure spin-dependent transport properties in organic semiconductors to better understand the fundament mechanisms that govern spin-relaxation mechanisms.

Nanomaterials

Nanomaterials offer many unique advantages in the design of chemical sensors and energy conversion devices, principally due to the large surface area-to-volume ratio. We have several projects involving the synthesis of semiconducting nanostructures for applications in thermoelectrics, photocatalysis and chemical sensors.

Selected Publications

K. Anderson and G. Szulczewski, “”Polymeric nanocomposities of Te and Bi2Te3 nanowires in PEDOT:PSS: Synthesis and electrical transport studies” in Polymer Composites for Energy Harvesting, Conversion, and Storage, Chapter 7, 2014. P. 147-163, ACS Symposium Series, Volume 1161.

S. MK. Anderson, L. Guo, A. Yousuf, E. Ellingsworth, C. Vajner, H.-T. Wang, and G. Szulczewski, “Temperature dependent thermopower and electrical conductivity of Te nanowire/PEDOT:PSS microribbons” App. Phys. Lett. 105 (2014) 073905. 

L. Guo, A. Aglan, H. Quan, J. Sun, C. Tang, G. Szulczewski, and H.-T. Wang, “Selective adsorption of bismuth telluride nanoplatelets through electrostatic attractions” Phys. Chem. Chem. Phys. 16 (2014) 11297-11302.

E. Ellingsworth, B. Turner, and G. Szulczewski, “Thermal conversion of [Fe(phen)3](SCN)2thin films into the spin crossover complex Fe(phen)2(NCS)2” RSC Advances  3 (2013) 3745-3754.

G. Szulczewski, “Spin-polarized tunneling and magnetoresistance in molecular junctions” Current Topics Chemistry 312 (2012) 275-302.

A. J. Drew, G. Szulczewski, L. Nuccio, and W. P, Gillin, The role of interfaces in organic spin valves revealed through spectroscopic and transport measurements”, Phys. Status Solidi B249 (2012) 9-17.

Z. He, J. Chen, Z. Sun, G. Szulczewski, and D. Li, “Air-flow navigated crystal growth for TIPS pentacene-based organic thin-film transistors” Organic Electronics 13 (2012) 1819-1826.

G. Szulczewski, J. Brauer, E. Ellingsworth, J. Kreil, H. Ambaye, and V. Lauter, “Electronic and structural characterization of LiF tunnel barriers in organic spin-valve structures” J. Appl. Phys. 109 (2011) 07C509.

M. Venkatesan, H. Tokuch, F. Burke, G. Szulczewski, J. M. D. Coey, “Magnetic properties of Alq3/Co interfaces” J. Appl. Phys. 109 (2011) 07C507.

G. Szulczewski, S. Sanvito, and J. M. D. Coey, “A spin of their own”, Nature Materials 8(2009) 693.