ORGANO-THERMAL CRYSTAL-GROWTH OF ALPHA-6 THIOPHENE

Organic solvents contained in sealed glass capsules in the temperature range 150-250 degrees C can dissolve 0.5 to similar to 18 wt% of mode rate molecular weight organic oligomers often as much as 10-100 x prev iously reported solubility. We report solubilities of alpha-hexathioph ene (a promising thin film transistor material) as high as 18% and des cribe the growth of small crystals by slow cooling. This work suggests that previously recalcitrant organics may be grown as single crystals under ''organo-thermal'' conditions.