Method for disentangling molecular chains of polythiophene in solution to accelerate crystallization

Abstract

The invention relates to a method for disentangling molecular chains of polythiophene in a solution to accelerate the crystallization, which comprises the steps of: (1) preparing a polythiophene solution with coexisting two phases; and (2) using ultrasonic wave to oscillate the solution to cause the molecular chains of the polythiophene to be disentangled and crystallized. The disentanglement of entangled molecular chains of the polythiophene in the solution is realized through simple ultrasonic oscillation. As shown in ultraviolet absorption spectrum of the solution, after the solution is subjected to ultrasonic oscillation for 4 minutes in a dissolving state, the peak intensity at a wavelength of 458nm is reduced, the red shift appears, and the peak intensities at a wavelength of 550nm and a wavelength of 603nm are increased, which shows that the content of orderly aggregated microcrystals of the polythiophene in the solution is increased. A dynamic light scattering profile of the solution shows that: after the solution is subjected to ultrasonic oscillation for 4 minutes, the peak intensity which takes 8nm as particle size is reduced, the size of the microcrystals is changed into 92nm from 147nm, and the peak intensity of the microcrystals is greatly improved, which further proves that the content of the microcrystals is increased after the polythiophene solution is subjected to ultrasonic oscillation.

Description

technical field [0001] The invention relates to a method for promoting crystallization by disentanglement of polythiophene molecular chains in a solution. Background technique [0002] As a conjugated polymer material, polythiophene has good semiconductor properties and has been widely studied in the fields of organic thin film transistors, organic solar cells, and organic light-emitting diodes [1,2]. Charges in polythiophene crystals tend to transport along the direction of π-π conjugation, and disordered regions seriously hinder charge transport. Therefore, improving the crystallinity of polythiophene films and improving the degree of interconnection between crystals is very important for improving their photoelectric properties. In order to obtain polythiophene films with high crystallinity, the solution is usually pretreated to increase the content of crystallites in the solution. The current pretreatment methods include cooling treatment or adding poor solvents to red...

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Problems solved by technology

This seriously affects the crystallization and ordered aggregation of polythiophene after solution deposition to form a polythiophene film, reducing its photoelectric performance.

However, for how to reduce the degree of entanglement of polythiophene molecular chains to facilitate its self-assembly in solution to form microcrystals, there is no effective solution [6] (references: (1) Kim, D.H.; Park, Y.D. ; Jang, Y.; Yang, H.C.; Kim, Y.H.; Moon, D.G.; Park, S.; Mater. 2005, 15, 77.

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