Organic photovoltaic cell with cesium trifluoroacetate as cathode modification layer and preparation

Abstract

An organic photovoltaic cell with cesium trifluoroacetate as a cathode modification layer is formed by sequentially overlapping a transparent conductive substrate, an anode buffer layer, an active layer, the cathode modification layer and a metal back electrode. The cathode modification layer is made of the cesium trifluoroacetate, and the thickness x of the cathode modification layer is lager than or equal to 0.2 nanometer to less than or equal to 1 nanometer. The preparation method comprises the steps of sequentially coating the anode buffer layer, the active layer, and the cathode modification layer in a spin mode by means of a spin-coating method on the clean transparent conductive substrate, and plating the metal back electrode in an evaporation mode by means of a thermal evaporation plating method. The cesium trifluoroacetate is coated in spin mode as the cathode modification layer by means of the solution spin-coating method, so the cell has the advantages of enabling the polarity of molecules to be stronger, being beneficial to charge separation and transmission, and obviously improving photoelectric conversion efficiency and stability of an organic photovoltaic device. Compared with an inorganic lithium fluoride cathode modification layer, the cesium trifluoroacetate serving as the cathode modification layer can form better interface contact with the active layer. The cell is simple in manufacture process, low in cost, good in reproducibility, and suitable for industrialized production.

Description

【Technical field】 [0001] The invention relates to the field of organic photoelectricity, in particular to an organic photovoltaic cell using cesium trifluoroacetate as a cathode modification layer and its preparation. 【Background technique】 [0002] With the increasing depletion of global oil resources, solar cells are a feasible way to solve the world's energy crisis, and the utilization of solar energy has become a frontier topic of extensive research. Therefore, vigorously developing the solar cell industry and using sunlight to generate electricity has become a new energy strategy for the sustainable economic development of countries all over the world. The research and development of solar cells has always been carried out around the following two key issues: (1) improving photoelectric conversion efficiency and life (2) using new materials to reduce costs. So far, the high temperature and high vacuum required in the preparation process of inorganic photovoltaic cells ...

AI Technical Summary

Problems solved by technology

The film formation of these inorganic substances (LiF, TiOx) requires expensive electron beam and vacuum evaporation equipment, the method is relatively complicated, and the film thickness is not easy to control accurately

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

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

Images