Sexithiophene a-6T and Derivatives

From the point of applications a-6T is by far the most important oligothiophene. Like a-5T sexithiophene forms highly ordered or crystalline films on oxidic siuTaces, 

Literature Substrate Tsub Evaporation rate Base pressure Layer thickness Observed structure Method 

The dichroism of the first UV-Vis absorption band of HV evaporated films in the monolayer range is only slightly lower if compared to a-5T, leading to0 = 22°[181]. This orientation, however, deteriorates much faster by increasing the layer thickness. Hamano et al. [184] find an even better orientation (0 = 4.3°) for films evaporated in UHV. 

In SFM most of the films appear not completely uniform in their height level (but see below), but show crystallites. This is in line with several other publications in which a-6T polycrystalline films were grown. 

There are few measurements on non-oxidic substrates, although more attention has been paid to this topic recently. 

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