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SEMICONDUCTION AND PHOTOCONDUCTION ACTIVATION ENERGIES OF THE RETINALS
Author(s) -
Rosenberg Barnett,
Harder Horold C.
Publication year - 1967
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1967.tb08768.x
Subject(s) - activation energy , photoconductivity , retinal , materials science , chloride , chemistry , optoelectronics , biochemistry , metallurgy
‐The semiconduction and photoconduction currents through 1‐ml thick sandwich cells of all‐trans‐, 13‐ cis‐ , 11‐ cis ‐retinal‐, and 13‐ cis ‐retinal‐m‐nitroaniline‐hydrogen chloride were measured as a function of the temperature in both the crystalline and melted states. From the slopes of graphs of the log of the current against 1000/TGK, the activation energies for semiconduction and photoconduction were calculated using the conductivity equations for the band model. The results of the average semiconduction activation energy measurements fell into two categories: The first group has activation energies between 1.9 and 2.4 eV and includes crystalline all‐ trans‐ , 13‐ cis ‐,9 cis ‐retinal, and both crystalline and melted 13‐ cis ‐retinal‐ m ‐nitroanaline hydrogen chloride; the second group has activation energies between 3.1 and 3.6 eV and includes crystalline 11‐ cis ‐retinal samples shorted. The average photoconduction activation energy for crysalline 13‐ cis ‐ and 11‐ cis ‐retinal, being 0.25 and 0.24 eV respectively, were essentially identical within experimental error, whereas the same parameter for 13‐ cis ‐retinal‐ m ‐nitroaniline hydrogen chloride was considerably lower at 0.15 eV. All‐ trans ‐retinal was not measurably photoconductive and 9‐ cis ‐retinal was only slightly photoconductive.