Effect of aromatic substituents on the absorption spectra,photoconductivity, and photoelectromotive force of cuprous organoacetylenides |
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Authors: | V S Myl'nikov I R Gol'ding A M Sladkov |
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Institution: | (1) Department of Physics, Philipps University Marburg, Renthof 5, 35032 Marburg, Germany;(2) Department of Physics and Material Sciences Center, Philipps University Marburg, Renthof 5, 35032 Marburg, Germany |
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Abstract: | 1. |
As the number of fused rings in the ligand of the cuprous organoacetylenides with the general formula ArC CCu, where Ar may be phenyl, -naphthyl, -naphthyl, or 9-anthracenyl, is increased, there is a tendency toward a bathochromic shift in the absorption, photoconductivity, and photoelectromotive-force spectra. Para substituents in the phenyl ring cause increasing bathochromic shifts in the absorption maxima along the series CH3 < h="">< cl="">< i=""><>3 <>2.
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The photoeleetromotive-force spectra are similar to the absorption spectra, and the principal photoconductivity maximum is located on the edge of the absorption band.
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The photoconductivities determined from the absorption spectra and the energies of the forbidden gaps determined from the photoelectromotive-force spectra correlate well with each other. This indicates that the conductivity of the cuprous organoacetylenides is intrinsic. The p type of the photocurrent carrier has been established.
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The nature of the spectra of the cuprous organoacetylenides as a function of the method of construction has been discussed, and the decisive role of the steric factors in the migration of the photocurrent carriers has been shown.
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