Low-temperature (1.8 K) excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P1−xAsx)2 crystals were studied at x=0.01, 0.02, 0.03 and 0.05. Energy gap and rydbergs of excitonic B, C and A-series decrease monotonically at the increase of x. Spectral half-widths of absorption n=1 lines of B and A-series increase monotonically at the increase of x due to fluctuations of crystal potential. Emission lines of excitonic molecules were observed in photoluminescence spectra of Zn(P1−xAsx)2 crystals. Binding energy of molecule increases at the increase of x that is due to the decrease of the electron-hole mass ratio.
@article{arxiv.cond-mat/0103388,
title = {Excitons and Excitonic Molecules in Mixed $Zn(P_{1-x}As_{x})_{2}$ Crystals},
author = {O. A. Yeshchenko and M. M. Biliy and Z. Z. Yanchuk},
journal= {arXiv preprint arXiv:cond-mat/0103388},
year = {2009}
}
Comments
10 pages, 7 figures, paper submitted to Physica B: Condensed Matter