Facile Fabrication and Characterization of Oriented and Multilayer Thin Films of Solution Processable Conjugated Polymer

Abstract

Fabrication of multilayer thin films of solution‐processable organic semiconductors has great potential in organic electronics but adopting existing thin film techniques to attain this is highly cumbersome. In this work, a unique unidirectional floating film transfer method (UFTM) has been utilized, which allows the facile fabrication of large area and oriented thin films of conjugated polymers. Using this method, we have successfully fabricated and characterized multilayer and oriented thin films of regioregular poly(3‐hexylthiophene) without having any adverse effect on the underlying layers. Optical characterizations revealed that fabricated thin films are anisotropic with a dichroic ratio of 2.2 having a single layer thickness of 14.5 nm. X‐ray diffraction results demonstrated uniformity in the crystallinity of the multilayered thin film with comparable crystallite size and inter‐planar spacing with purely edge‐on molecular orientation. The organic field effect transistor fabricated using multilayer thin films also exhibits a uniform and saturated charge carrier mobility of about 0.1 cm2V‐1s‐1.This article is protected by copyright. All rights reserved.