Preparation method and film forming method of segmented copolymers with fullerene at main chain

Abstract

The invention belongs to the technical field of organic photovoltaic materials, in particular to a preparation method and a film forming method of segmented copolymers with fullerene at a main chain. The segmented copolymers consist of fullerene, polyalkoxylated thiofuran and polylactic acid, and the segmented copolymers can automatically form micro-phase separation structures under the controllable dimension in the film forming process, so electron hole pairs are effectively separated on a micro-phase interface, the micro-phase separation structures formed by the method have good stability, the fullerene is used as electron receiving materials to be sequentially arranged on the micro-phase interface, and the consumption of the expensive fullerene is greatly saved. The preparation method provided by the invention has the advantages of simple and convenient process, high film forming quality, high input-output ratio, low cost, wide application prospects and the like. Products prepared by using the preparation method provided by the invention belong to a new generation of green environmental-protection high-performance chemical engineering products and can be used in the field of organic photovoltaic materials.

Description

technical field [0001] The invention belongs to the technical field of organic photovoltaic materials, and in particular relates to a preparation method of a block copolymer containing fullerene in the main chain and a film-forming method thereof. Background technique [0002] With the development of modern industry and the depletion of fossil energy, energy demand has become the focus of attention of all countries in the world. The development of various new energy sources and the development of light, cheap and high-quality power sources have become the goals that scientists are striving for. As we all know, solar energy is inexhaustible. However, as an industrial energy source, solar energy has the disadvantage of low energy density. In order to make full use of this cheap, environmentally friendly, and renewable new energy, it has always been the goal that people pursue to produce cheap, efficient, and large-area solar photovoltaic cells. [0003] At present, silicon-b...

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Problems solved by technology

[0008] So far, there are mainly the following methods to form ordered heterojunctions: one is the blending method, by combining electron donors such as polythiophene and electron acceptors such as C 60 After blending and post-processing to obtain an ordered heterojunction, the disadvantage of this method is that the post-processing conditions are difficult to control, and the stability of the film during use is also poor; Mixed method, although this method can control the scale of the microphase more conveniently, it is difficult to remove the surfactant remaining on the microphase interface, so that the electron-hole pairs cannot be effectively separated; the third is the hard template method. Spin-coating organic electron donors (such as P3HT) in nanoporous templates of inorganic electron acceptors (such as titanium dioxide templates), this method is easy to cause distortion of polymer chain segments and reduce photovoltaic conversion efficiency; the fourth is through the block copolymer Microphase separation method, this method can not only effectively control the size of the microphase by adjusting the length of each chain segment, but also form a thin film with good stability. However, there are few reports on the application of this method in organic photovoltaics. In particular, block copolymers containing fullerenes in the backbone have not been reported

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