Research Of Preparation And Thermal Radiation Control Of Periodic Microstructure In Solar Photovoltaic Power Generation

With the development of economy, the problem of energy shortage has caused attention of increasing people. Especially since March11,2011, fukushima nuclear accident in Japan, countries around the world take their eyes into development of new energy. Solar energy is one kind of clean natural renewable and unlimited energy. Solar thermal power generation, solar thermo-photovoltaic cells, solar thermal power technology has been attracted special attention because it widely exists and can be converted to electricity efficiently.In the hydraulic engineering, by use of solar energy technology, the problem of insufficient power supply requirements can be solved in dry season; and solve agricultural irrigation or drinking and waterelevating problem of population in remote rural areas. As a new energy for solar photovoltaic power generation system, it has been well applied in hydraulic construction engineering. Periodic microstructure surfaces is a kind of cell cycle arrangement on substrate surface, it have reflection, absorption and emission characteristics and can effectively improve the spectral emissivity. Thermo-photovoltaic(TPV) is a typical application of thermal radiation spectrum control with microstructure, and in this paper, we made disscussion of the effect of thermal radiation with a periodic particle structure coated by gold film.1, Make use of surface plasmon polaritons (SPPs), we made a kind of periodic structure, which is use for studying thermal radiation. At first, own to convenient, high efficiency, self-assembly method are used to make photonic crystal. Next, gold film followed by vacuum evaporation deposition method.2, Directional emission measurement experiment is used for measurement of gold coated SiO2particles periodic structure, and found that, in wavelength is about5μm, resonance peak appeared, which is consistent with theoretical calculation results. The emission rate is maximum in vertical incidence, and with increase of incident angle, the surface plasma resonance wavelength peak decreases. The reason except the presence of defects, there are also various kinds of composite wave to come out together, which include produced by SPPs and microcavity resonant effect.3, According to the RCWA principle, using DiffractMOD simulation software for calculation, and compared with experiment results. The position of surface plasma resonance wavelength same with the size of particles’period. And with increase of gold film thickness, the surface plasma wavelength peak become slow, peak width become wider, this is because the surface electric field become disorder with gold film thickness increase. After adding SiO2particles, particles’plasma enhanced, and the ball-cavity resonance were produced, in addition, SiO2particles makes the dielectric constant increases inside the spherical shell, shortwave region of band gap of photonic crystal become red shift, therefore it lead to resonance wavelength peak also become red shift.4, According to the research, periodic microstructure coated by gold film can effectively stimulate the Surface Plasmon Polaritons. Own to the resonance phenomenon of SPPs, absorptivity is enhanced. We can well know the size of absorptivity from the strength of SPPs, from this point, the thermal radiation characteristics can be controlled.