The innovation engine for new materials

Persistent photoconductivity in SrTiO3

Seminar Group: 


Prof. Matt McCluskey


Department of Physics & Astronomy
Washington State University


Tuesday, April 17, 2018 - 11:00am


MRL Room 2053


Prof. Chris Van de Walle

Annealed strontium titanate (SrTiO3) exhibits large persistent photoconductivity (PPC) at room temperature. Upon exposure to sub-band-gap light, the resistance drops by 3 orders of magnitude, a change that persists “forever” after the light is turned off. Recently PPC was exploited to write a conductive path on a crystal, using a 405 nm laser. The defects responsible for this effect, as well as other strange phenomena, will be discussed.