The spectrum of harmonics generated and propagated in ionized noble gas has been analyzed using one-dimensional wave propagation equation. The result shows that the spectral lines of harmonic become broadened and then...The spectrum of harmonics generated and propagated in ionized noble gas has been analyzed using one-dimensional wave propagation equation. The result shows that the spectral lines of harmonic become broadened and then split into two peaks when the laser intensity is strong enough to ionize the noble gas. The influence of laser parameters and gas pressure on the splitting has been made clear.展开更多
This paper proposes a power system concept that integrates photovoltaic （PV） and thermoelectric （TE） technologies to harvest solar energy from a wide spectral range. By introduction of the ＇spectrum beam splittin...This paper proposes a power system concept that integrates photovoltaic （PV） and thermoelectric （TE） technologies to harvest solar energy from a wide spectral range. By introduction of the ＇spectrum beam splitting＇ technique, short wavelength solar radiation is converted directly into electricity in the PV cells, while the long wavelength segment of the spectrum is used to produce moderate to high temperature thermal energy, which then generates electricity in the TE device. To overcome the intermittent nature of solar radiation, the system is also coupled to a thermal energy storage unit. A systematic analysis of the integrated system is carried out, encompassing the system configuration, material properties, thermal management, and energy storage aspects. We have also attempted to optimize the integrated system. The results indicate that the system configuration and optimization are the most important factors for high overall efficiency.展开更多
Most current solar panels are fabricated via complex processes using expensive semiconductor materials,and they are rigid and heavy with a dull,black appearance.As a result of their non-aesthetic appearance and weight...Most current solar panels are fabricated via complex processes using expensive semiconductor materials,and they are rigid and heavy with a dull,black appearance.As a result of their non-aesthetic appearance and weight,they are primarily installed on rooftops to minimize their negative impact on building appearance.The large surfaces and interiors of modern buildings are not efficiently utilized for potential electric power generation.Here,we introduce dual-function solar cells based on ultrathin dopant-free amorphous silicon embedded in an optical cavity that not only efficiently extract the photogenerated carriers but also display distinctive colors with the desired angle-insensitive appearances.Light-energy-harvesting colored signage is demonstrated.Furthermore,a cascaded photovoltaics scheme based on tunable spectrum splitting can be employed to increase power efficiency by absorbing a broader band of light energy.This study pioneers a new approach to architecturally compatible and decorative thin-film photovoltaics.展开更多
基金This work is supported by the National High-Tech 863 Project the Optimum Science Research Program of the Shanghai Branch the Chinese Academy of Sciences.
文摘The spectrum of harmonics generated and propagated in ionized noble gas has been analyzed using one-dimensional wave propagation equation. The result shows that the spectral lines of harmonic become broadened and then split into two peaks when the laser intensity is strong enough to ionize the noble gas. The influence of laser parameters and gas pressure on the splitting has been made clear.
基金supported by the Focused Deployment Project of the Chinese Academy of Sciences(KGZD-EW-302-1)the Key Technologies R&D Program of China(grant no.2012BAA03B03)a UK EPSRC grant under EP/K002252/1
文摘This paper proposes a power system concept that integrates photovoltaic （PV） and thermoelectric （TE） technologies to harvest solar energy from a wide spectral range. By introduction of the ＇spectrum beam splitting＇ technique, short wavelength solar radiation is converted directly into electricity in the PV cells, while the long wavelength segment of the spectrum is used to produce moderate to high temperature thermal energy, which then generates electricity in the TE device. To overcome the intermittent nature of solar radiation, the system is also coupled to a thermal energy storage unit. A systematic analysis of the integrated system is carried out, encompassing the system configuration, material properties, thermal management, and energy storage aspects. We have also attempted to optimize the integrated system. The results indicate that the system configuration and optimization are the most important factors for high overall efficiency.
基金This work was supported in part by the National Science Foundation(ECCS),Grant No.1202046The study of the interfacial charge-transport layers was supported by the Center for Solar and Thermal Energy Conversion,an Energy Frontier Research Center funded by the US Department of Energy,Office of Science,Basic Energy Sciences,under Award DE-SC0000957
文摘Most current solar panels are fabricated via complex processes using expensive semiconductor materials,and they are rigid and heavy with a dull,black appearance.As a result of their non-aesthetic appearance and weight,they are primarily installed on rooftops to minimize their negative impact on building appearance.The large surfaces and interiors of modern buildings are not efficiently utilized for potential electric power generation.Here,we introduce dual-function solar cells based on ultrathin dopant-free amorphous silicon embedded in an optical cavity that not only efficiently extract the photogenerated carriers but also display distinctive colors with the desired angle-insensitive appearances.Light-energy-harvesting colored signage is demonstrated.Furthermore,a cascaded photovoltaics scheme based on tunable spectrum splitting can be employed to increase power efficiency by absorbing a broader band of light energy.This study pioneers a new approach to architecturally compatible and decorative thin-film photovoltaics.
