abstract

although polycrystalline lead oxide (pbo) has a long history of application in optoelectronics and imaging, the transport mechanism for electrons in this material has not yet been clarified. using the photo-generated charge extraction by linear increasing voltage (photo-celiv) technique, we provide the temperature- and field-dependences of electron mobility in poly-pbo. it is found that electrons undergo dispersive transport, i.e. their mobility decreases in the course of time. multiple trapping of electrons from the conduction band into the developed band tail is revealed as the dominant transport mechanism. this differs dramatically from the dispersive transport of holes in the same material, dominated by topological factors and not by energy disorder.

continue reading the article: http://iopscience.iop.org/article/10.1088/1361-6463/50/3/035103/meta

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the entire group is immensely grateful for the invaluable knowledge!

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abstract

although polycrystalline lead oxide (pbo) belongs to the most promising photoconductors for optoelectronic and large area detectors applications, the charge transport mechanism in this material still remains unclear. combining the conventional time-of-flight and the photo-generated charge extraction by linear increasing voltage (photo-celiv) techniques, we investigate the transport of holes which are shown to be the faster carriers in poly-pbo. experimentally measured temperature and electric field dependences of the hole mobility suggest a highly dispersive transport. in order to analyze the transport features quantitatively, the theory of the photo-celiv is extended to account for the dispersive nature of charge transport. while in other materials with dispersive transport the amount of dispersion usually depends on temperature, this is not the case in poly-pbo, which evidences that dispersive transport is caused by the spatial inhomogeneity of the material and not by the energy disorder.

continue reading the article: http://www.nature.com/articles/srep33359

the post congratulations to oleksii semeniuk on publishing a paper in scientific reports – nature appeared first on rezniklab and posted by pavlo karasyuk.