Effects of the driving pulse frequency on drop velocity jetted with a 1 wt.% TIPS-PEN solution.
(a) Dispersive and polar component of surface energy measured from a solvent cleaned wafer and surface-treated substrates. (b) Surface energy measured after different air exposure times of 2, 4, and 6 h.
(Color online) Optical microscopy of a printed inkjet droplet array on a surface treated silica substrate using a 2 wt.% TIPS-PEN solution dissolved in o-DCB. Drop spacing was 150 μm. (a) and (d) were printed on solvent-cleaned wafer after air exposure times of 2 and 4 h, respectively; (b) and (e) on an HMDS-treated wafer after air exposure times of 2 and 4 h respectively; (c) and (f) on a UV-ozone cleaned wafer after air exposure times of 2 and 4 h, respectively.
(a) Wetting envelope contour of an HMDS treated substrate of 0°, 20°, 40°, 60°, 80°, 100°, 120°; (b) 0° contours for substrates after surface treatment.
(Color online) Optical microscopy of TIPS-pentacene films (0.28 mm × 0.57 mm rectangular pattern printed at 20 μm drop spacing) observed on surface treated silica substrates printed after 2 h (a)–(c) and 4 h (d)–(f) exposure to air. (a) and (d) were printed on solvent cleaned wafer; (b) and (e) on HMDS-treated wafer; (c) and (f) on UV-ozone cleaned wafer. White arrows on (b) and (e) highlight the uncovered oxide surface. The film uniformity of the UV-ozone cleaned surface shows the best film integrity and least geometry deformation. The bar indicates 150 μm.
XRD diffraction patterns recorded from dot arrays and a thin film of inkjet printed TIPS-pentacene.
(Color online) Polarized optical microscopy of TIPS-pentacene (a) an isolated dot and (b) portion of a film near the right border. Both were inkjet printed on a UV-ozone treated substrate with a 2 wt.% solution. The film was inkjet printed at 20 μm drop spacing.
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