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On the Dynamical Behaviour of Excitons in CdS Single Crystals. II. Correlation between Intrinsic Excitonic Absorption and Photoconductivity
Author(s) -
Voigt J.,
Ost E.
Publication year - 1969
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.19690330136
Subject(s) - photoconductivity , exciton , ambipolar diffusion , absorption edge , absorption (acoustics) , materials science , diffusion , absorption spectroscopy , biexciton , condensed matter physics , excitation , molecular physics , chemistry , electron , optoelectronics , physics , optics , band gap , thermodynamics , quantum mechanics , composite material
An investigation is made of the excitation spectra of photoconductivity of CdS single crystals in the region of the fundamental absorption edge from 77°K to room temperature. The results are compared with those of excitonic absorption measurements. On the basis of conclusions about the dynamical behaviour of excitons, equally drawn from absorption, emission, and photoconductivity measurements, a model is proposed of the photoconductivity in the region of exciton transitions, which explains the correlation between the exciton absorption and photoconductivity. This model involves that the diffusion length of the excitons don't exceed that of the ambipolar electron–hole pair diffusion.