Application Of Fractal Structure Electrode In Dye Sensitized Solar Cell

At present, with the imminent exhaustion of traditional resources and serious environmental pollution becoming increasingly prominent, development and utilization of solar energy is an effective means to solve the energy problem, and the solar cell is an important way of using solar energy effectively.In recent years, the dye sensitized solar cells(DSSC) and perovskite solar cells have received extensive attention.However, due to the constraint of the traditional flat plate structure, the potential of the electrode in the normal structure has not been fully excavated, and the solar light has not been fully utilized.Forest is the most common collection system of solar energy in nature.The undulating surface of the forest can increase the photic area to improve the utilization of light.Because of the scattering and reflection of light in the interior of the forest, the forest can be used to improve the utilization of light by thecapture of the multi-level structure of the branches and leaves. The study uses a simple electrodeposition method to grow a kind of biomimic fractal structure on both the one-dimensionalfiber and two-dimensional plate, which forms a forest-like metal electrode and has the anti-reflection effect(ARE).Low-cost micro forest type DSSCs were then fabricated by assembling uniform Zn O nano arrays on these electrodes with complex hierarchy structure, via a specially modified hydrothermal method.The research specifically includes the following aspects:(1)The study designeda thin layer reactor, an all-round reactor and a socket reactor reactor based on the diffusion limited aggregation(DLA) of fractal growth kinetics, and made three kinds ofdendrite in these reactors, such as street-tree like dendrite, spike like dendrite,and micro forest dendrite, respectively. And the conditions of the fractal growth of Ni dendrites were optimized,through the regulation of the fractal growth of Ni dendrite.(2) Through the UV-Vis spectrum and Fluorescence spectrum, the significantanti-reflection effect of the micro forest fractal nickel dendrite was further explored. The study find that compared with nickel plate, the light reflectivity is reduced by 30% in the wavelength range of 300-800 nm, and it is also found that the organic coupling of micro scale and nano scale(Micro-Dendrite\Nano-Zn O) can improve the ability of the electrode to capture photons.(3)The studyused a novel spray process to makea seed layer of ZnO on the complex surface of the fractal nickel dendrite, and then the neat nano-ZnO arrays were prepared on the fractal nickel dendritic by the hydrothermal. Besides,the hydrothermal condition was optimized.(4)The study has prepared anovel DSSC by using the fractal structure electrode with significant anti-reflection effect.Results showed that compared with the traditional plate electrode, thephotoelectric propertiesof the novel DSSC with the Nano-ZnO/Dendriteelectrode have been greatly improved.In addition, this new type of DSSC also has good mechanical stability.Withing the good ARE, The forest type electrode of bionic fractal structure has a very good application in photovoltaic cells, and also has a very broad application prospects in the many areas, such as photocatalysis, photocatalytic water splitting and trace analysis.