Effects of disorder on the optical properties of deep UV quantum well emitters as assessed by photonic atom probe
Abstract
The Photonic Atom Probe, a technique allowing the simultaneous, in situ acquisition of photoluminescence within a tomographic atom probe, is applied to the study of AlGaN quantum wells within deep-UV (DUV) separate confinement heterostructures. The analyzed sample exhibits a high degree of compositional and morphological disorder, translating into spatial inhomogeneities and a significant dispersion of photoluminescence emission energy. We show how the proposed in situ correlative microscopy approach can explain different optical emission features in these structures, particularly the distinction between the optical signatures of non-defective quantum well (QW) and QWs located within defective regions. The results, including time-resolved photoluminescence, are interpreted through eight-band k.p calculations, which take as an input to the statistical properties extracted from the atom probe tomography composition maps. This links DUV emission heterogeneity to nanoscale disorder within the same analyzed volume, providing insight relevant to improving multi-QW structures.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (12)
S. Ndiaye
University of Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux 1 , 76000 Rouen,
E. Coccato
University Grenoble-Alpes, CEA, Grenoble INP, IRIG, PHELIQS 2 , 38000 Grenoble,
N. Al Helou
University of Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux 1 , 76000 Rouen,
S. Kumar Gautam
University of Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux 1 , 76000 Rouen,
J. Cañas
University Grenoble-Alpes, CEA, Grenoble INP, IRIG, PHELIQS 2 , 38000 Grenoble,
A. Jannaud
University Grenoble Alpes, CEA, LETI 3 , 38000 Grenoble,
S. Cuesta
University Grenoble-Alpes, CEA, Grenoble INP, IRIG, PHELIQS 2 , 38000 Grenoble,
J. Houard
University of Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux 1 , 76000 Rouen,
A. Grenier
University Grenoble Alpes, CEA, LETI 3 , 38000 Grenoble,
N. Rochat
University Grenoble Alpes, CEA, LETI 3 , 38000 Grenoble,
E. Monroy
University Grenoble-Alpes, CEA, Grenoble INP, IRIG, PHELIQS 2 , 38000 Grenoble,
L. Rigutti
University of Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux 1 , 76000 Rouen,