The Optical Properties of Germanane

POSTER

Abstract

Hydrogenated 2D germanium, known as germanane (GeH), is predicted to be a direct bandgap semiconductor with high electron mobility ($\sim$ 10$^{\mathrm{4}}$ cm$^{\mathrm{2}}$/Vs) and circularly polarized optical selection rules. However, very little experimental work on the optical properties of germanane has been reported to date. Here, we present temperature-dependent photoluminescence (PL) and photoluminescence excitation spectroscopy (PLE) data on several-layer germanane grown by Molecular Beam Epitaxy (MBE). We observe a broad PL band that is Stokes-shifted by hundreds of meV below the predicted direct bandgap of 1.53 eV. The PL intensity increases by several orders of magnitude upon decreasing the temperature from room temperature to 4K.

Authors

  • Patrick Odenthal

    • Univ of California - Riverside

  • Walid Amamou

    • Univ of California - Riverside

  • Dante O'Hara

    • University of California Riverside
    • University of California, Riverside
    • Univ of California - Riverside

  • Luyi Yang

    • Los Alamos National Laboratory
    • National Magnetic Field Labratory, Los Alamos National Labratory

  • William Rice

    • National Magnetic Field Labratory, Los Alamos National Labratory
    • Los Alamos National Lab

  • Scott Crooker

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Lab, Los Alamos National Laboratory
    • National Magnetic Field Labratory, Los Alamos National Labratory

  • Roland Kawakami

    • Ohio State Univ - Columbus
    • The Ohio State University
    • Ohio State University
    • The Ohio State University, Dept of Physics
    • Univ of California - Riverside, The Ohio State University