The Changchun Yinghua Institute of conjugated polymer composite film morphology control and performance research

Conjugated polymers are widely used in flexible displays, solar cells, and integrated circuits due to their ease of processing. They have become an important branch of the polymer field. Therefore, it has become a research hotspot in recent years to regulate its morphology through a simple and effective method, thereby significantly improving its performance.

Researcher Yang Xiaoniu of the Changchun Institute of Applied Chemistry at the Chinese Academy of Sciences, etc., aimed at this important research direction, taking conjugated macromolecules and their composite films as the research object, and conducted research on the relationship between condensed state structures of conjugated macromolecules and device performance. The charge transport energy barriers, crystallization kinetics and thermodynamics of conjugated polymers have revealed the enhancement of charge transport and the precise mechanism of morphological regulation of composite films, providing necessary theory and experiments for the preparation of high conductivity composite films and high-efficiency polymer solar cells. Based on this, the results were recently awarded the first prize of 2014 Jilin Provincial Natural Science Award.

They took the lead in discovering the phenomenon that the insulating matrix enhances the conductivity and mobility of semiconducting polymers, and proposed a new method for the control of the two-phase interface and phase separation by means of solution self-assembly to prepare semiconductor/insulator polymer composites with excellent conductivity. . For the first time, the conductivity of the conjugated polymer reinforced by the insulating matrix was studied using the methods of conductive atomic force and charge transfer behavior under low temperature changing conditions. The charge transport enhancement mechanism and the key factors and necessary conditions for the enhancement of the conductivity were revealed. The development of new materials for polymer composites with excellent conductivity, ease of processing, low cost and stability has opened up new avenues.

This study proposes and implements a controlled solvent atmosphere treatment for the first time. It is the first to obtain a new orientation method in which the main chain of polythiophene is arranged perpendicular to the substrate. It breaks through the limitation of the traditional film thickness on the longitudinal charge mobility and systematically studies the polythiophene model system. The crystallization kinetics and thermodynamic behavior were the first to achieve the mutual transformation between different crystal forms under controlled solvent atmosphere/thermal annealing conditions, leading to the conclusion that the thiophene main chain is arranged in a thermodynamically stable state perpendicular to the substrate.

A new method for preparing “electronic ink” by using the crystallinity of conjugated polymers to form ordered precursors in solution was proposed, which eliminated the limitations of thermal annealing and other processes on the preparation process of large-area devices and achieved one-step preparation of high crystallinity. The photosensitized layer process with high mobility and high photoelectric conversion efficiency has formed the ability to produce large area polymer solar cells.

They took the lead in using the 3D electronic scanning reconstruction technology to realize the three-dimensional structure visualization of the photosensitive layer in the true sense, revealed the transport mechanism of the charge in the photosensitive layer, clearly clarified the direction of the condensed structure of the photosensitive layer of the composite thin film, and constructed exciton diffusion, The three-dimensional model between dissociation, charge transport and condensed state structure has become a classic model in the field of organic batteries, laying a solid foundation for the efficiency of polymer solar cells.

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