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[16a-Z17-7] Orientation Characteristics of Large-area Thin Films of Conjugated Polymers
Fabricated via ribbon-shaped FTM
Keywords:orientation, conjugated polymer, OFETs
Efforts have been made to improve the charge transport in thin films of conjugated polymers (CPs) by improving their film crystallinity. Solution processability of CPs makes them a potential candidate for OFETs. The quasi-one-dimensional nature of polymer backbones offers increase in carrier transport when oriented along the channel direction of OFETs. Most of orientation methods are either not suitable for large-area organic thin-film fabrication or not capable for multi-layered film fabrication due to chemical and mechanical damages. Ribbon-shaped FTM developed by Tripathi et al. for large-area film fabrication with oriented polymer chains offers various advances and can solve most of the issues that exist with other conventional techniques.
In this work, we successfully fabricated uniform and oriented large-area floating film of PQT C-12 using ribbon-shaped FTM. It was observed that the films were highly uniform along the length and width of the spreading direction which was interpreted by the variation in peak intensity of non-polarized absorption spectra. The films were found to have high dichroic ratio (DR) > 10 and quite uniform at the center. The initial characterizations of polarized spectra revealed that orientations at the edge in these floating films were in different direction to that of center region. Polymer orientation direction at the edges shifts to several degrees with respect to center area due to the sheer force of liquid substrate which continuously acts on the films' edges while spreading the floating film. These variations were measured with angle-dependent polarized absorption mapping for the entire region, and it was found that orientation intensities were similar everywhere, however, the direction of backbone orientation varied along the width, i.e., center, boundary, and most edges regions of the PQT C-12 ribbons. In this work, we will present all these characteristics in details.
In this work, we successfully fabricated uniform and oriented large-area floating film of PQT C-12 using ribbon-shaped FTM. It was observed that the films were highly uniform along the length and width of the spreading direction which was interpreted by the variation in peak intensity of non-polarized absorption spectra. The films were found to have high dichroic ratio (DR) > 10 and quite uniform at the center. The initial characterizations of polarized spectra revealed that orientations at the edge in these floating films were in different direction to that of center region. Polymer orientation direction at the edges shifts to several degrees with respect to center area due to the sheer force of liquid substrate which continuously acts on the films' edges while spreading the floating film. These variations were measured with angle-dependent polarized absorption mapping for the entire region, and it was found that orientation intensities were similar everywhere, however, the direction of backbone orientation varied along the width, i.e., center, boundary, and most edges regions of the PQT C-12 ribbons. In this work, we will present all these characteristics in details.