A hyperthermal seedable supersonic beam, speci® cally designed for the deposition of thiophene based oligomers, is presented. The beam's properties are characterized by time-of-¯ight mass spectrometry and photoionization spectroscopy. Several quaterthiophene (T4) ® lms under di erent beam conditions have been prepared and characterized by optical absorption, uorescence spectroscopy and scanning electron microscopy. Centreline heavier species segregation in the beam is exploited to grow T4 ® lms e ciently from impurities present in raw terthiophene (T3) powders. The morphology and structure of the ® lms can be controlled by the beam' s parameters that in turn allow variation in¯ux density, energy and orientation of molecules in the beam.
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