Organic photovoltaic battery with cesium acetate as cathode modification layer and preparation method thereof

Abstract

The invention relates to an organic photovoltaic battery with a cesium acetate cathode modification layer and a preparation method thereof, belonging to the field of organic photoelectricity. The organic photovoltaic battery comprises a transparent conducting substrate 1, an anode buffer layer poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) 2, an active layer 3, a cathode modification layer 4 and a metal back electrode layer 5. The preparation method comprises the following steps: cleaning the transparent conducting substrate, and drying; spin coating the PEDOT:PSS anode buffer layer 2 on the transparent conducting substrate 1, and drying; spin coating the organic active layer 3 on the PEDOT:PSS anode buffer layer 2, and drying; depositing the cesium acetate cathode modification layer 4 on the active layer 3; and coating the metal back electrode layer 5 by a thermal evaporation method on the cesium acetate cathode modification layer 4. In the invention, the cesium acetate is applied as a cathode modification layer of an organic photovoltaic device by a thermal evaporation or solution spin coating method. Compared with the traditional inorganic salt lithium fluoride (LiF) cathode modification layer, the cesium acetate organic salt as the cathode modification layer can form better interfacial contact with the active layer, thereby remarkably improving the photoelectric conversion efficiency and stability of the organic photovoltaic battery devices.

Description

[Technical Field]: [0001] The invention relates to the field of organic optoelectronics, in particular to an organic photovoltaic cell using cesium acetate as a cathode modification layer and a preparation method thereof. 【Background technique】: [0002] With the depletion of global oil resources, the development of new energy sources has become increasingly important. Solar cells are devices that directly convert light energy into electrical energy. As a feasible method to solve the world energy crisis, the use of solar energy has become a frontier subject of extensive research. Therefore, vigorously developing the solar cell industry and using solar power to generate electricity has become a new energy strategy for the sustainable economic development of all countries in the world. Experts predict that photovoltaic power generation will account for 50% of the world's total power generation by 2030. The research and development of solar cells have always been carried out arou...

AI Technical Summary

Problems solved by technology

These inorganic substances (LiF, TiO x ) film formation requires the use of expensive electron beam and vacuum evaporation equipment, the method is more complicated, and the film thickness is not easy to control precisely

The organic material BCP needs to be formed into a film by vacuum evaporation, and the film thickness is related to the experimental conditions, which is expensive and cannot be prepared in a large area

From a practical point of view, it is not conducive to industrial mass production

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