Polymer solar cell with reverse structure and preparation method thereof

Abstract

The invention discloses a polymer solar cell with a reverse structure and a preparation method thereof and relates to a solid apparatus especially suitable for converting optical energy into electric energy. The cell is a polymer solar cell which is of a reverse structure and has a three-component photoactivity film in a layered structure; the polymer solar cell is composed of a cathode layer, anorganic N-type doped electron hole barrier layer, a three-component photoactivity layer, an organic P-type doped electron hole transmission layer and an anode layer which are orderly deposited on a glass substrate, wherein the mass proportion of the three-component film is as follows: P3HT:PC61BM:BCP=12:10:(0.01-12):10:0.1 or PCPDTBT:PC71BM:Bphen=12:15:(0.01-12):15:0.1. The energy conversion efficiency of the three-component photoactivity layer is 20% higher than the existing two-component photoactivity layer, and a filling factor is further 10% higher than that in the prior art; and meanwhile, the defects of the existing polymer solar cell with a reverse structure are overcome.

Description

technical field [0001] The technical solution of the invention relates to a solid device specially adapted for converting light energy into electric energy, specifically a polymer solar cell with an inverted structure and a preparation method thereof. Background technique [0002] Energy issues are related to national security and are of great significance. In today's world, while reducing the consumption of fossil energy, people are also actively looking for and developing new energy utilization and conversion technologies. Due to the advantages of organic semiconductors such as flexibility and low cost, organic solar cells have become one of the focuses of current renewable energy technologies. At present, the most advanced organic photovoltaic conversion technology uses a polymer / small molecule two-component photoactive film with a bulk heterojunction structure. The highest single-tube energy conversion efficiency has reached 8.13%, but the commercialization requirement ...

AI Technical Summary

Problems solved by technology

In polymer solar cells with normal structures, blend films of poly(3,4-ethylenedioxythiophene) and poly(styrenesulfonic acid) are often used as hole transport layers, but poly(styrenesulfonic acid) Acidity is very corrosive to conductive indium tin oxide thin films, which reduces the stability of polymer solar cells. Moreover, active metals (such as calcium) are often used as cathodes in polymer solar cells with normal structures, which is not conducive to The long-term stability of polymer solar cells, however, does not have these problems in polymer solar cells with an inverted structure; the second is to develop a simple method that can effectively adjust the morphology and structure of the photoactive film, which is easy to produce with solution coating combination of methods and minimize the time required for photoactive film post-processing to increase printing production speed

CN101577313 discloses an inverse structure polymer solar cell and a preparation method thereof. Although the prior patent application technology has solved the worldwide problem of corrosion of the ITO glass surface by a mixed solution of poly-3,4-ethylenedioxythiophene and polystyrene sulfonic acid However, the prior patent application technology has the following three disadvantages: ① Titanium dioxide (TiO 2 ) The molding processing temperature of the thin film is between 400 and 500°C, which is very close to the decomposition temperature of ITO, so the damage to the ITO substrate is very serious, which is not conducive to the preparation of long-life polymer solar cells; ② Using P3HT: The PCBM two-component blend film is used as the active layer, and a bulk heterojunction structure is formed after annealing, which has no innovation in the processing technology of photoactive films; ③Using copper phthalocyanine (CuPc) as the hole transport layer, its Very low conductivity, poor hole exporting ability

CN101997085A discloses an organic small molecule solar cell with an inverted structure, using ITO as the cathode of the device, avoiding the pollution problem caused by using active metals as the cathode, but this is a technology that has long been recognized in the world, and the prior patent application The technology has the following three disadvantages: ① the use of metal materials with low work function, with a thickness of 1 to 2 nanometers, is used as a hole blocking layer, and very thin metal materials with low work function, that is, active metals will bring Great instability; ②The layered structure is formed by sequentially evaporating different materials in a vacuum coating machine, the process is complicated and the cost is high; ③Use MoO 3 As the anode modification layer, that is, the hole transport layer, its conductivity is very low and the hole exporting ability is poor.

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