Real time monitoring of ordering in pentacene films during growth by using in-situ infrared spectroscopy

Thin Films and Bulk Phases Conucleate at the Interfaces of Pentacene Thin Films

“…A prior study utilized the C−H outof-plane deformation vibrations (900−960 cm −1 ) to assess the presence of the TFP and BP. 14,43,44 It has been shown that there is a blueshift in the peaks at 905 and 956 cm −1 for the BP. The observed trend in this spectral region shown in Figure 2b is consistent with the XRD results as there was an increase in the BP with an increase in the deposition temperature.…”

“…The ring stretching modes between 1200 and 1500 cm –1 have been used to identify the average orientation of pentacene on a substrate , but were not considered in this study due to a low signal-to-noise ratio. A prior study utilized the C–H out-of-plane deformation vibrations (900–960 cm –1 ) to assess the presence of the TFP and BP. ,, It has been shown that there is a blueshift in the peaks at 905 and 956 cm –1 for the BP. The observed trend in this spectral region shown in Figure b is consistent with the XRD results as there was an increase in the BP with an increase in the deposition temperature.…”

Effect of In Situ Annealing Treatment on the Mobility and Morphology of TIPS-Pentacene-Based Organic Field-Effect Transistors

“…Actually, this modulation of substrate temperature directly influences the solvent evaporation rate. Lower annealing temperature allows TIPS-pentacene crystals to grow slowly with ordered molecules [33], while higher substrate temperature contributes to quickly solidification, without a relatively slow drying process of solvent [34]. Thus, a longer time was obtained for molecular selforganization during the spray process, which is responsible for a higher degree of phase separation and a larger domain size [33,35,36].…”

“…Lower annealing temperature allows TIPS-pentacene crystals to grow slowly with ordered molecules [33], while higher substrate temperature contributes to quickly solidification, without a relatively slow drying process of solvent [34]. Thus, a longer time was obtained for molecular selforganization during the spray process, which is responsible for a higher degree of phase separation and a larger domain size [33,35,36]. As a consequence, slender and longish grains are formed, and the bridges for carrier transportation in the channel region can be built through these long grains which are longer than 110.8 μm [37].…”