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(Color online) Large tetracene crystal grown by the vapor-Bridgman technique. The longitudinal axis is approximately parallel to the crystallographic direction.
Typical transit curves along the -direction recorded for the vapor-Bridgman crystal (black curve, at , , thickness ) and sublimation-grown crystals (gray curve, at , , thickness ).
Effective hole mobility in the -direction vs temperature (log-log scale) for the vapor-Bridgman crystal (◇) and for sublimation crystals (other symbols). The latter indicate the good reproducibility for crystals from different batches. The dashed line is an estimation of the intrinsic mobility from the data of the sublimation-grown crystals.
Gas chromatography spectra of tetracene (1) pristine material, (2) after purification by step sublimation, (3) after crystal growth in -flow reactor, and (4) after step sublimation followed by vapor-Bridgman growth. For clarity, the curves are shifted mutually by an offset.
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