The Research Of The Performance Of Antireflection Film On Solar Cells Prepared By The Template

The sunlight that exposures on the surface of the battery can’t be fully absorbed. A very big part is reflected off. In order to lower the over-top reflection of solar cells, the surface of solar cell and capsulized cover plate are gradually using anti-reflection film with nano-structure too. With the vigorous development of the nanotechnology, using it in the design of the solar cell to becomes a new trend. Antireflection film material with nanometer array structure has the advantages of high transmission rate and low refractive index, which is popular with the majority of scientific and technical workers.Considering that the covers of solar battery is heavy and easy to get dirty to reduce the efficiency of the battery, this paper is going to using polyimide materials for the base material and anodic alumina porous structure as master plate. Nano-imprin lithography is used to produce the thin film with light trapping scheme which has subwavelength nano rod array and Ti O2 nanometer film is sputtered on the back. Polyimide antireflection film with self-cleaning function is using to replace the heavy glass cover.Based on strictly coupled wave theory, equivalent medium theory and the formation mechanism of anodic aluminum oxide template, Tracepro optical simulation software is used to simulate the impacts of nanometer array structure size parameters on the system of minus reflection luminous flux. The best height of nanometer grating structure is 72 nm in theory and the duty cycle is 0.5. The ideal effect can be get at the cycle of the 300 nm and 440 nm and grating period of 440 nm has the best result of absorbing the incident light.Porous alumina nano array is prepared by using secondary anodic oxidation. On the surface of the polyimide film, in the condition of 280 °C, the pressure of 800 kg and the time of 10 minutes, polyimide film with nanometer array grating structure is prepared by using hot embossing. Using craftwork of RF magnetron sputtering method, we can create a layer of Ti O2 film on the back. Thanks to the craftwork of isothermal annealing at 200 °C for 2 hours, the whole surface contact angle can reach 44 °. Now we can take the advantage of Ti O2 film’s photocatalysis, the antireflection film can have the function of cleaning itself as a result.Using scanning electron microscope and atomic force microscope to analyze the antireflection film, we use spectrophotometer and ellipsometer to test the antireflection film’s light transmittance and refractive index in the meantime. The result shows that on the condition of atmospheric layer, UV-VIS transmitted spectrum ranges from 440 nm to 1 000 nm. The PI film with nano array structure is 2%~5% higher than the original PI film. With the test of package test of the solar battery, the solar battery’s filling factor raises by 2%. The whole function of the battery works well.