Hall Effect in Bulk-Doped Organic Single Crystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 28417482.
- Also identified by DOI 10.1002/adma.201605619.
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Abstract
The standard technique to separately and simultaneously determine the carrier concentration per unit volume (N, cm<sup>-3</sup> ) and the mobility (μ) of doped inorganic single crystals is to measure the Hall effect. However, this technique has not been reported for bulk-doped organic single crystals. Here, the Hall effect in bulk-doped single-crystal organic semiconductors is measured. A key feature of this work is the ultraslow co-deposition technique, which reaches as low as 10<sup>-9</sup> nm s<sup>-1</sup> and enables us to dope homoepitaxial organic single crystals with acceptors at extremely low concentrations of 1 ppm. Both the hole concentration per unit volume (N, cm<sup>-3</sup> ) and the Hall mobility (μ<sub>H</sub> ) of bulk-doped rubrene single crystals, which have a band-like nature, are systematically observed. It is found that these rubrene single crystals have (i) a high ionization rate and (ii) scattering effects because of lattice disturbances, which are peculiar to this organic single crystal.