Logo image
Back
Isotopic exchange in solid cobalt locyphthalocyanine—II: Space-charge-limited electron injection
Journal article

Isotopic exchange in solid cobalt locyphthalocyanine—II: Space-charge-limited electron injection

Mohanan Kalliat, M.U. Farooq, Prasanna Kumar and Amar Nath
Journal of inorganic & nuclear chemistry, v 43(2), pp 281-285
1981
DOI: https://doi.org/10.1016/0022-1902(81)90009-9

Abstract

It has been shown that electrons are injected during the space-charge-limited-current injection in CoPc, using Al and Au electrodes. There is direct evidence of injected electrons inducing exchange in 57Co 2+ doped Copc. A fraction of the injected charge is trapped during injection. It is depopulated during subsequent thermal treatment, and is available for inducing exchange. The donor density in CoPc can thus be manipulated. When CoPc is treated with oxygen, holes are injected into the material, which can be sensed by doping the material with the probe 57Co 2+. The holes induce considerable exchange. If electrons are injected in oxygen-treated CoPc, electron-hole recombination occurs and the concentration of holes is considerably reduced as probed by doping it with 57CoCl 2. However, if the size of the particles (from which the pellet is compacted) is very small (∼ 12μ), the sorbed O 2 apparently succeeds in populating practically all the recombination centers with holes. Subsequent electron injection in this material does not lead to electron-hole recombination. The recombination centers with trapped holes presumably cease to act as recombination centers. Consequently, one can inject large concentrations of electrons over a prolonged period, without bringing about any diminution in the population of holes.

Metrics

Details

UN Sustainable Development Goals (SDGs)

This publication has contributed to the advancement of the following goals:

#3 Good Health and Well-Being
Logo image