Nanoscale structure and morphology of thin films of poly(2-chloroxylylene) synthesized by the CVD method on different liquids

Porzio, William; Scavia, Guido; Arnautov, S.A.; Conzatti, Lucia; Charmet, Jérôme; Laux, Edith; Keppner, H.; Zerbi, G.; Bolognesi, A.

doi:10.1016/j.eurpolymj.2011.06.016

Cited by 3 publications

(2 citation statements)

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“…The influence of the microstructure on the electrical behavior of semiconducting polymers was demonstrated by several groups. − According to Spano and Silva, the photophysics of P3HT can be understood using the concepts of J- and H-aggregation. The P3HT can behave as an H-type aggregate or a J-type aggregate depending on the morphology of the thin film influenced by the preparation method.…”

Section: Introductionmentioning

confidence: 99%

Thickness Effect on Structural Defect-Related Density of States and Crystallinity in P3HT Thin Films on ITO Substrates

et al. 2018

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We report on a study of thickness effect on the formation of structural defect-related density of states (DOS) in the band gap of poly(3-hexylthiophene-2,5-diyl) (P3HT) thin films spincoated on ITO substrates. The energy-resolved electrochemical impedance spectroscopy and grazing-incidence wide-angle X-ray scattering were used to correlate the DOS with the degree of crystallinity in P3HT thin films. We found an exponential increase of the defect DOS in the band gap with increasing fraction of the amorphous phase when decreasing the film thickness. The exponent increases abruptly when reducing the thickness down to 30 nm, which indicates two thickness regions with different dynamics of the defect DOS formation driven by increasing the fraction of the amorphous phase. Moreover, we observed the co-existence of two P3HT polymorphic crystalline phases with different backbone spacings, which results in the appearance of a peculiar DOS satellite peak above the highest occupied molecular orbital. The volume of the minor, more dense, crystalline phase exhibits a thickness dependence with a maximum plateau around 40 nm. These results suggest an important effect of the substrate roughness on the crystallinity and polymorphism of P3HT thin films depending on the film thickness with general implications for polymer thin films.

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Section: Introductionmentioning

confidence: 99%

Thickness Effect on Structural Defect-Related Density of States and Crystallinity in P3HT Thin Films on ITO Substrates

et al. 2018

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“…We wanted to pursue this goal without losing other important characteristics, including transparency, solvent resistance, barrier properties, and biocompatibility. Various methods have been developed to functionalize parylene, including the film post treatment using chemical and physical methods (such as plasma and photo-oxidation) [10][11][12], the surface functionalization by SOLID process on reactive liquids [13][14][15][16], and the synthesis and polymerization of functionalized PC [17][18][19][20][21][22][23][24]. Since we were interested in a bulk more than a surface modification, we have followed the latter approach.…”

Section: Introductionmentioning

confidence: 99%

Enhanced elasticity in parylene thin films by copolymerization approach

et al. 2014

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The application of poly(p-xylylene)s as barrier and passivation layer is limited by the high tensile modulus of this class of materials. In this view, we propose a modified chemical vapor deposition approach to realize a series of copolymers based on parylene C, where linear alkyl chains partially replace the chlorides substituents. Thanks to the efficacious inclusion of bulky alkyl chains into the parylene layer, these modified materials show clear differences in both thermal and mechanical properties with respect to pristine parylene C. In particular, by following this approach, a decrease of the Young's modulus up to 0.3 GPa (13 times reduction of parylene C modulus) is observed, indicating a neat enhancement of the elastic behavior. Besides the improved mechanical performance, the modified materials retain both barrier and biocompatibility properties typical of neat parylene C. The results presented support copolymerization as a valuable approach for tuning parylene properties, which enlarges further the field of application of this excellent multipurpose material

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