所属单位：能源与动力学院
发表刊物：ENERGY CONVERSION AND MANAGEMENT
关键字：Composite subwavelength structures Full spectrum Photon management Photovoltaic-thermoelectric hybrid systems
摘要：In this work, advanced photon-management composite subwavelength structures are fabricated to manage solar energy in the full-spectrum (300-2500 nm) wavelength range for the application of the photovoltaic-thermoelectric hybrid systems to fully utilize the solar energy. This proposed photon-management method will simultaneously realize efficient light trapping for the photons with above-bandgap energy in solar cells and the utilization of the below-bandgap photons and the waste heat resulting from the thermalization effect in solar cells with bottom thermoelectric devices. The typical structure is designed: Top ordered hexagonal nanohole arrays can trap above-bandgap photons to enhance the absorption in the silicon wafer, and TiO2/SiO2 bilayer films are deposited on the bottom side of the wafer to improve the transmission of the below-bandgap photons. similar to 97% total absorptance for wavelengths of 300-1100 nm is achieved with optimized diameters of central nanoholes. The total transmittance, on the other hand, is improved to similar to 60% from 1200 nm to 2500 nm. The results indicate that the structures realize the appropriate allocation of photons within different wavelength ranges to different devices for sufficient utilization of full-spectrum solar energy. This novel full-spectrum photon management benefits from the strong scattering effect among the nanoholes and the gradient refractive index of bilayer films. Moreover, the photon-management performance shows angle-independent and polarization-insensitive characteristics. This method can be applied to various kinds of solar cells for photovoltaic-thermoelectric hybrid systems and may provide thoughts for other solar harvesting applications.
ISSN号：0196-8904
是否译文：否
发表时间：2017-11-15
合写作者：Xu, Yuanpei,刘向雷
通讯作者：宣益民
发表时间：2017-11-15