News

Prof. Diana Huffaker has been awarded nearly $1.4 million from the National Science Foundation to study fundamental issues related to organic/inorganic hybrid solar cells.

New publication: a joint paper with Prof. Diana Huffaker, Dr. Ping-Show Wong, and Aaron Katzenmeyer (Sandia National Labs) entitled "Poole-Frenkel Effect and Phonon-Assisted Tunneling in GaAs Nanowires" will be published in Nano Letters.

Research Highlights

  • Nanopillar arrays are have lithographically-defined dimensions and pitch. Material systems include III-As, III-P and III-Sb on Si and III-V substrates.
  • Catalyst-free patterned nanopillars are highly uniform and crystallographic.
  • Patterned quantum dots have been embedded in LED structures for 1.55 µm emitters on GaAs.
  • Nanopillar arrays are coated with transparent conducting material, for example, ITO, ZnO or graphene for solar cell applications.
  • Demonstration of a bottom-up photonic crystal device with GaAs/InGaAs nanopillars. Diameter and pitch dependence on growth create active and photonic band-gap regions with low surface roughness and minimal re-absorption losses.