Premium
Molecular Excitons in Quasi‐One‐Dimensional Conducting Crystals (Semiconductors and Metals)
Author(s) -
Vlasova R. M.,
Kapustin V. A.,
Semkin V. N.,
Sekretarczyk G.,
Agroskin L. S.,
Papayan G. V.,
Rautian L. P.
Publication year - 1984
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.2221220220
Subject(s) - exciton , semiconductor , spectral line , crystal (programming language) , absorption spectroscopy , condensed matter physics , dielectric , atomic electron transition , chemistry , materials science , molecular physics , optics , physics , optoelectronics , astronomy , computer science , programming language
Polarized reflection spectra are investigated of single crystals of molecular semiconductors Cs 2 (TCNQ) 3 , NMe2,6MePy(TCNQ) 2 TEA(TCNQ) 2 , and of metals TTT(TCNQ) 2 , TTF‐TCNQ in the spectral region framing the band of π‐electron intramolecular transitions of TCNQ 0 , TCNQ − , and (TCNQ) 2 2−(250 to 750 nm). Through Kramers‐Kronig relation absorption spectra are calculated and spectra of the imaginary part of the dielectric constant. In Cs 2 (TCNQ) 3 and in TTF‐TCNQ the 370 nm electronic transition band exhibit Davydov splitting. The splitting magnitude averaged over the transition and the components polarization ratio are determined. In the crystals with asymmetric cations inhomogenious broadening of the band is observed. This broadening is associated with the influence of the chaotic potential of the crystal structure on the transition. Using the inhomogeneous broadening magnitude the magnitude of the chaotic potential in TEA(TCNQ) 2 is estimated being 0.9 eV.