Polymer blend effects on fundamental properties of mesogenic phthalocyanine films fabricated by heated spin-coating method

Abstract

Polymer blending effects on the properties of the mesogenic phthalocyanine thin films fabricated by heated spin-coating method were demonstrated. The spin-coated films of 1,4,8,11,15,18,22,25- octahexylphthalocyanine (C6PcH 2 ) blended with poly(3-hexylthiophene) (P3HT) were prepared by controlling the temperatures of substrates and solutions with the mixed material, and the morphology and optical property of the fabricated film were studied. In the case of the low composite ratio of P3HT, the wide crack lines found in pure C6PcH 2 films disappeared while maintaining the uniaxial aligned optic axis direction in the large-area with the diameters of exceeding 1 mm. The polymer blend effects were discussed by taking the anisotropic optical absorption and molecular stacking structure in the films into consideration.

Polymer blend effect on molecular alignment induced by contact freezing of mesogenic phthalocyanine

“…24) In the heated spin-coated C6PcH 2 film, similar cracks also appeared in the process of cooling to room temperature; however, the cracks could be suppressed by mixing a π-conjugated polymer, poly(3hexylthiophene) (P3HT). 25) A similar P3HT blend effect was partly reported in the uniaxially oriented C6PcH 2 thin films fabricated by contact freezing; 26) however, the details still remain to be understood.…”

Three-dimensional X-ray Crystal Structure Analysis of Solution-processed Oriented Thin Film utilizing Liquid-crystalline Phthalocyanine

“…Uniaxial planar alignment of C6PcH 2 in thin films has been realized by unique techniques such as heated spincoating [17], [18] and contact freezing method utilizing the supercooled LC state [19], [20]. By these methods, uniaxial planar oriented thin films were fabricated in the LC phase of C6PcH 2 ; however, undesired cracks generated in the films in the cooling process, because of the volumetric shrinkage, resulting in prohibiting the carrier transport.…”