Intense pulsed light induced crystallization of a liquid-crystalline polymer semiconductor for efficient production of flexible thin-film transistors

Physical Chemistry Chemical Physics : PCCP
Hee Yeon YangJung Ah Lim

Abstract

Here we demonstrated the split-second crystallization of a liquid-crystalline conjugated polymer semiconductor induced by irradiation with intense pulsed white light (IPWL) for the efficient improvement of electrical properties of flexible thin film transistors. A few seconds of IPWL irradiation of poly(didodecylquaterthiophene-alt-didodecylbithiazole) (PQTBTz-C12) thin films generated heat energy through the photo-thermal effect, leading to the crystallization of PQTBTz-C12 and formation of nodule-like nanostructures. The IPWL-induced crystallization of PQTBTz-C12 resulted in a threefold improvement in the field-effect mobility of thin film transistors compared to as-prepared devices. The conformational change of the PQTBTz-C12 chains was found to be strongly related to the irradiation fluence. As a proof-of-concept, the IPWL treatment was successfully applied to the PQTBTz-C12 layer in flexible transistors based on plastic substrates. The performance of these flexible devices was significantly improved after only 0.6 s of IPWL treatment, without deformation of the plastic substrate.

References

Apr 20, 2002·Science·Shandon D HartYoel Fink
Oct 27, 2004·Nature Materials·Jiaxing Huang, Richard B Kaner
Jul 16, 2009·Journal of the American Chemical Society·Laura J CoteJiaxing Huang
Apr 17, 2013·ACS Applied Materials & Interfaces·Byung-Yong WangYoung-Jei Oh
Aug 8, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Teppei ArakiKatsuaki Suganuma

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