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Optical properties of CuCl films on silicon substrates
Author(s) -
Mitra Anirban,
O'Reilly L.,
Lucas O. F.,
Natarajan Gomathi,
Danieluk D.,
Bradley A. L.,
McNally P. J.,
Daniels S.,
Cameron D. C.,
Reader A.,
MartinezRosas M.
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200844021
Subject(s) - exciton , photoluminescence , luminescence , binding energy , materials science , silicon , semiconductor , lattice constant , spectroscopy , crystal (programming language) , silicon nitride , single crystal , optoelectronics , analytical chemistry (journal) , condensed matter physics , chemistry , atomic physics , crystallography , optics , physics , diffraction , quantum mechanics , computer science , programming language , chromatography
Semiconductor photonic emitters operating in the UV range remain an elusive goal. Attention has focused mainly on III‐Nitrides. However a large lattice constant difference between the III‐Nitride layers and compatible substrates results in high densities of misfit dislocations and consequently the device performance is adversely affected. An alternative novel material system, γ‐CuCl on silicon, is investigated. Properties of the exciton luminescence from vacuum deposited CuCl films on Si(100) and Si(111) are studied using temperature dependent photoluminescence (PL) spectroscopy. Four peaks attributed to the free exciton (Z 3 ) (3.203 eV), bound exciton (I 1 ) (3.181 eV), bi‐exciton (M) (3.159 eV) and bound bi‐exciton (N 1 ) (3.134 eV) are identified from the PL spectrum at 10 K. A free exciton peak at 3.230 eV is observed at room temperature. The binding energies for the bound exciton, bi‐exciton and bound bi‐exciton are determined. Parameters, extracted from the temperature dependence of the Z 3 PL peak intensity, energy and line‐width, have been compared with CuCl films on different substrates and in single crystal form. The luminescence properties of the CuCl on Si material system are found to compare well with reports for single crystal CuCl. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)