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SUMMARY:Advancing the Frontiers of the Synthesis and Photoelectrochemical P
 roperties of Metastable Semiconductors
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20240227T160000
UID:2026-04-29-02-26-53@natsci.colostate.edu
DTSTAMP:20260429T022653
Description:About the Seminar:\n\nMetastable semiconductors have been disco
 vered in many chemical systems that have desirable properties for driving 
 fuel-producing redox reactions from sunlight\, including broad visible-lig
 ht absorption\, optimal band edge energies\, defect tolerance\, and functi
 onal carrier mobilities. These photoelectrochemical properties have freque
 ntly been found to be associated with their metastable nature\, e.g.\, fro
 m specific features in their crystal structures leading to their thermodyn
 amic instability with respect to phase segregation. Recent results will be
  presented on new mixed-metal oxides that unveil flux-mediated synthetic a
 pproaches for kinetic stabilization in this growing class of semiconductor
  systems.1-4 Their syntheses have been achieved by reactions that leverage
  the exothermic formation of stable salt side products as well as shortene
 d reaction diffusion pathways and lowered reaction temperatures. Kinetic s
 tabilization of the products has also been enhanced via the application of
  a) high cohesive energies of an underlying substructure that is maintaine
 d during the reaction\, and b) solid-solution compositions which help to i
 nhibit phase segregation while also providing for percolation pathways.  
 These approaches have yielded\, e.g.\, the first known Sn(II)-perovskites 
 that are isoelectronic to widely commercialized Pb(II)-containing piezoele
 ctrics.1  Photocatalysis of these semiconductors will primarily be descri
 bed for light driven H2O-splitting or CO2-reduction reactions when in aque
 ous solutions under ultraviolet and visible-light irradiation.2\,3\n\nRefe
 rences:\n1) Switching Lead for Tin in PbHfO3: Noncubic Structure of SnHfO3
 . Gabilondo\, E. et al. Angew. Chem. Int. Ed. 2023\, e202312130(1-9).\n2) 
 Metastability and Photoelectrochemical Properties of Two Cu(I)-Based Oxide
 s with Delafossite Structures. O’Donnell\, S. et al. Chem. Mater. 2023\,
  35\, 1404-1416.\n3) Capturing Metastable Oxide Semiconductors for Applica
 tions in Solar Energy Conversion. Maggard\, P.A. Acc. Chem. Res. 2021\, 54
 \, 3160-3171.\n4) Renaissance of Topotactic Ion-Exchange for Functional So
 lids with Close Packed Structures. Maggard\, P.A. et al. Chem. Eur. J. 202
 2\, 28\, e202200479(1-6).\n\nAbout the Speaker: \n\nPaul A. Maggard earne
 d his Ph.D. in solid-state materials chemistry at Iowa State University in
  Ames\, Iowa.  Following a post-doctoral stint at Northwestern University
  in Evanston\, IL\, he accepted a faculty position in the Department of Ch
 emistry at North Carolina State University.  Current research efforts in 
 his laboratory focus on the flux and hydrothermally- mediated syntheses of
  crystalline metal oxides and chalcogenides\, transition-metal halides\, c
 arbon nitrides\, and metal-oxide/organic hybrids and investigations of the
 ir physical properties. He has received the NSF CAREER award\, Beckman You
 ng Investigator award and a Research Corporation for Science Advancement (
 Scialog) award. 4:00 pm
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