The influence of thermal effect on the energy conversion efficiency of concentrating photovoltaic system for multi-junction GaInP/GaAs/Ge thin-film solar cell is analyzed experimentally.With the increment of operation...The influence of thermal effect on the energy conversion efficiency of concentrating photovoltaic system for multi-junction GaInP/GaAs/Ge thin-film solar cell is analyzed experimentally.With the increment of operation temperature,the maximal energy conversion efficiency and optimal loaded resistor will be changed.Under the condition of operation temperature lower than 90℃.this influence of thermal effect is very small.However,when the operation temperature exceeds 90℃,the maximal conversion efficiency of the cells will decrease sharply,and contrarily the corresponding optimal loaded resistor will increase quickly.Then the system performance will degenerate badly and a thermal management will be necessary.展开更多
We report the fast lateral photovoltaic effect in pure congruent LiNbO3 crystal induced by pulsed laser and continuous wave laser with wavelengths of 355, 532, and 1064 nm. A typical ultrafast photovoltage can be obse...We report the fast lateral photovoltaic effect in pure congruent LiNbO3 crystal induced by pulsed laser and continuous wave laser with wavelengths of 355, 532, and 1064 nm. A typical ultrafast photovoltage can be observed on the surface perpendicular to the c axis, With the rise time of 1.5 ns and the full-width at half-maximum of 1-2 ns, when the laser pulse inhomogeneously irradiates on the crystal. The peak open-circuit photovoltages show a linear dependence on the incident laser intensities. The mechanism of the photovoltaic characteristics is proposed.展开更多
基金supported by the Shanghai Rising-Star Program(No.09QB1400700) the Knowledge Innovation Program of the Chinese Academy of Sciences(No. 0903531)
文摘The influence of thermal effect on the energy conversion efficiency of concentrating photovoltaic system for multi-junction GaInP/GaAs/Ge thin-film solar cell is analyzed experimentally.With the increment of operation temperature,the maximal energy conversion efficiency and optimal loaded resistor will be changed.Under the condition of operation temperature lower than 90℃.this influence of thermal effect is very small.However,when the operation temperature exceeds 90℃,the maximal conversion efficiency of the cells will decrease sharply,and contrarily the corresponding optimal loaded resistor will increase quickly.Then the system performance will degenerate badly and a thermal management will be necessary.
基金supported by the Program for New Century Excellent Talents in University,the National Natural Science Foundation of China (Nos. 50672132and 60778034)the Research Fund for the Doctoral Program of Higher Education (No. 200804250006)+1 种基金the Key Project of Chinese Ministry of Education (No.107020)the Beijng Natural Science Foundation(No. 4082026)
文摘We report the fast lateral photovoltaic effect in pure congruent LiNbO3 crystal induced by pulsed laser and continuous wave laser with wavelengths of 355, 532, and 1064 nm. A typical ultrafast photovoltage can be observed on the surface perpendicular to the c axis, With the rise time of 1.5 ns and the full-width at half-maximum of 1-2 ns, when the laser pulse inhomogeneously irradiates on the crystal. The peak open-circuit photovoltages show a linear dependence on the incident laser intensities. The mechanism of the photovoltaic characteristics is proposed.
