August 17, 2016 12:13 PM

Perovskite solar cells (PSCs) have attracted much attention owing to their high power conversion efficiency and low manufacturing cost. Recently, organotin perovskites have been synthesized as lead-free alternatives, and a number of chemical and processing modifications have been applied to these compounds in an effort to tune their crystal structure and electronic properties. More...

August 4, 2016 11:53 AM

Molybdenum disulfide (MoS2) attracts extensive interests because of its peculiar bandgap properties and the two-dimensional structure. The layer-dependent band structure has been studied by many theoretical calculations, including its evolution with pressure, e.g., the increase of the direct band gap by applying pressures. A recent study conducted at HPCAT reveals a structural characteristic that is strongly correlated to bandgap behavior, regardless of its form as monolayer or bulk.  More...

August 4, 2016 01:07 PM

The lanthanide elements show many interesting phenomena such as heavy fermion metal properties and unconventional superconductivity due to their ƒ electrons. Among all lanthanide metals, only Ce and Eu are known to become superconducting under pressure. In order to understand the interplay between magnetism and superconductivity in europium at extreme pressures, experiments using X-ray emission spectroscopy (XES) at HPCAT and nuclear forwarding scattering (NFS) at sector 3 of APS have been done recently. More...

August 1, 2016 06:24 PM

Materials combining the hardness and strength of diamond with the higher thermal stability of cubic boron nitride (cBN) have broad potential value in science and engineering. Reacting nanodiamond with cBN at high pressures and high temperatures provides a pathway to such materials. Recent experiments at HPCAT report the fabrication of C2-BN nanocomposite (2:1 ratio of diamond to cBN), measuring up to 10 mm in longest dimension.  More...

June 8, 2016 04:52 PM

Iron and oxygen are two of the most geochemically important elements on Earth. Recent experiments at HPCAT identified a highly stable, pyrite-structured iron oxide (FeO2) at 76 GPa and 1,800 K that holds an excessive amount of oxygen.  More...