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Excitons and Photoconductivity in Transition‐Metal Dichalcogenides
Author(s) -
Wieting T. J.,
Yoffe A. D.
Publication year - 1970
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.19700370140
Subject(s) - photoconductivity , exciton , transition metal , materials science , absorption edge , trigonal crystal system , phonon , absorption (acoustics) , ionization , absorption spectroscopy , metal , spectral line , condensed matter physics , hexagonal crystal system , optoelectronics , molecular physics , chemistry , crystallography , optics , physics , crystal structure , ion , band gap , astronomy , biochemistry , organic chemistry , metallurgy , composite material , catalysis
The photoelectrical properties of several transition‐metal dichalcogenides, principally MoS 2 , MoSe 2 , and MoTe 2 have been measured and compared with the optical absorption spectra. Both hexagonal and rhombohedral polytypes of MoS 2 were investigated. The regular structure near the absorption edge in photoconductivity has been interpreted by means of an exciton‐phonon ionization model, which accounts for the displacement and temperature dependence of the peak positions in MoS 2 .