以硒化铜纳米颗粒为能量受体,以罗丹明B为能量供体,二者之间通过光诱导电子转移而猝灭罗丹明B的荧光;而L-半胱氨酸能够诱导罗丹明B荧光的恢复,从而建立了测定L-半胱氨酸的新方法。在p H 4.6、温度为30℃条件下混合2 min后,罗丹明B在575...以硒化铜纳米颗粒为能量受体,以罗丹明B为能量供体,二者之间通过光诱导电子转移而猝灭罗丹明B的荧光;而L-半胱氨酸能够诱导罗丹明B荧光的恢复,从而建立了测定L-半胱氨酸的新方法。在p H 4.6、温度为30℃条件下混合2 min后,罗丹明B在575 nm处的荧光强度与溶液中L-半胱氨酸的浓度在2.5×10^(-7)~1.1×10^(-6)mol/L浓度范围内呈良好的线性关系,检出限(3σ/k)为5.5×10^(-8)mol/L。常见的氨基酸对半胱氨酸的测定干扰小,方法快速、选择性好。展开更多
Single crystals of a new quaternary rare-earth selenide RbEr2Cu3Se5 have been isolated through the RbCl flux reaction in the RE-Cu-Se system. The title compound crystallizes in an orthorhombic system, space group Cmcm...Single crystals of a new quaternary rare-earth selenide RbEr2Cu3Se5 have been isolated through the RbCl flux reaction in the RE-Cu-Se system. The title compound crystallizes in an orthorhombic system, space group Cmcm with a = 4.089(2), b = 14.498(6), c = 16.977(2) Angstrom, V = 1006.5(7) Angstrom(3), Z = 4, D-c = 6.63 g/cm(3), F(000) = 1720 and mu(MoKalpha) = 45.51 mm(-1). The final R = 0.0498 and wR = 0.0734 for 1401 observed reflections with I > 3 sigma(1). The structure of RbEr2Cu3Se5 is a three-dimensional tunnel structure composed of ErSe6 and CuSe4 polyhedra with the charge-balanced Rb+ cations stuffing into the one-dimensional channels along the a direction. In the Er2RbCu3Se5 structure, the (1)(infinity) [Er2Se(1)(4/2)SE(2)(2)Se(3)(4/2)] double-octahedral chains are linked into a (2)(infinity) [Er2Cu2Se6] layer in the a-b plane via sharing Se(1)-Se(3) edges with the (1)(infinity) [Cu(2)(2)Se(1)(2)Se(3)(4/2)] double tetrahedral chains, and (2)(infinity)[Er2CU2Se6] layers are further interconnected along the c direction by sharing Se(1)-Se(2) edges with the (1)(infinity) [Cu(1)Se(1)(2)Se(2)(2/2)] tetrahedral chains, forming a three-dimensional framework with the channels along the a axis accommodated by Rb+ ions.展开更多
Perovskite solar cells(PSCs)have attracted worldwide attention due to their high efficiency and low manufacturing cost.As the largest supplier of photovoltaic modules,China has made huge endeavors in the research on P...Perovskite solar cells(PSCs)have attracted worldwide attention due to their high efficiency and low manufacturing cost.As the largest supplier of photovoltaic modules,China has made huge endeavors in the research on PSCs.In 2019,Chinese research groups were still holding the top position for paper publications in the world.Both the efficiency and the stability of the device have been steadily increasing,pushing forward the commercialization of PSCs step by step.This review summarizes the highlights of China’s PSC research progress in 2019 and briefly introduces the development of PSC modules in industry.展开更多
The use of transparent conducting oxide(TCO)as a substrate in Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)thin-film solar cells allows for advanced applications,such as bifacial,semitransparent,and tandem solar cells with the capabil...The use of transparent conducting oxide(TCO)as a substrate in Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)thin-film solar cells allows for advanced applications,such as bifacial,semitransparent,and tandem solar cells with the capability to increase power density generation.However,the efficiency of this kind of solar cell is still below 6% based on the low-cost solution process.In this work,we develop a composition gradient strategy and demonstrate a 6.82% efficient CZTSSe solar cell on F:SnO_(2)(FTO)substrate under the ambient condition.The composition gradient is realized by simply depositing the precursor inks with different Zn/Sn ratios.To verify that the high performance of the solar cell is attributed to the composition gradient strategy rather than the sole change of the Zn/Sn ratio,devices based on absorbers with varied Zn/Sn ratios are fabricated.Furthermore,the structure and surface morphology of the CZTSSe films with/without composition gradients are examined.The presence of elemental gradient through the depth of the CZTSSe films before and after annealing is confirmed by secondary ion mass spectroscopy analysis.It is found that the composition gradient enhances the crystallinity of the absorber,reduces the surface roughness as well as device parasitic losses,contributing to a higher fill factor,open-circuit voltage,and conversion efficiency.展开更多
文摘以硒化铜纳米颗粒为能量受体,以罗丹明B为能量供体,二者之间通过光诱导电子转移而猝灭罗丹明B的荧光;而L-半胱氨酸能够诱导罗丹明B荧光的恢复,从而建立了测定L-半胱氨酸的新方法。在p H 4.6、温度为30℃条件下混合2 min后,罗丹明B在575 nm处的荧光强度与溶液中L-半胱氨酸的浓度在2.5×10^(-7)~1.1×10^(-6)mol/L浓度范围内呈良好的线性关系,检出限(3σ/k)为5.5×10^(-8)mol/L。常见的氨基酸对半胱氨酸的测定干扰小,方法快速、选择性好。
基金Supported by the Director Fund of Fujian Institute of Research on the Structure of Matter (No. 200196)
文摘Single crystals of a new quaternary rare-earth selenide RbEr2Cu3Se5 have been isolated through the RbCl flux reaction in the RE-Cu-Se system. The title compound crystallizes in an orthorhombic system, space group Cmcm with a = 4.089(2), b = 14.498(6), c = 16.977(2) Angstrom, V = 1006.5(7) Angstrom(3), Z = 4, D-c = 6.63 g/cm(3), F(000) = 1720 and mu(MoKalpha) = 45.51 mm(-1). The final R = 0.0498 and wR = 0.0734 for 1401 observed reflections with I > 3 sigma(1). The structure of RbEr2Cu3Se5 is a three-dimensional tunnel structure composed of ErSe6 and CuSe4 polyhedra with the charge-balanced Rb+ cations stuffing into the one-dimensional channels along the a direction. In the Er2RbCu3Se5 structure, the (1)(infinity) [Er2Se(1)(4/2)SE(2)(2)Se(3)(4/2)] double-octahedral chains are linked into a (2)(infinity) [Er2Cu2Se6] layer in the a-b plane via sharing Se(1)-Se(3) edges with the (1)(infinity) [Cu(2)(2)Se(1)(2)Se(3)(4/2)] double tetrahedral chains, and (2)(infinity)[Er2CU2Se6] layers are further interconnected along the c direction by sharing Se(1)-Se(2) edges with the (1)(infinity) [Cu(1)Se(1)(2)Se(2)(2/2)] tetrahedral chains, forming a three-dimensional framework with the channels along the a axis accommodated by Rb+ ions.
基金supported by the National Natural Science Foundation of China(11834011,11674219)。
文摘Perovskite solar cells(PSCs)have attracted worldwide attention due to their high efficiency and low manufacturing cost.As the largest supplier of photovoltaic modules,China has made huge endeavors in the research on PSCs.In 2019,Chinese research groups were still holding the top position for paper publications in the world.Both the efficiency and the stability of the device have been steadily increasing,pushing forward the commercialization of PSCs step by step.This review summarizes the highlights of China’s PSC research progress in 2019 and briefly introduces the development of PSC modules in industry.
基金supported by the National Natural Science Foundation of China(62074168)the Fundamental Research Foundations for the Central Universities(20lgpy04)。
文摘The use of transparent conducting oxide(TCO)as a substrate in Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)thin-film solar cells allows for advanced applications,such as bifacial,semitransparent,and tandem solar cells with the capability to increase power density generation.However,the efficiency of this kind of solar cell is still below 6% based on the low-cost solution process.In this work,we develop a composition gradient strategy and demonstrate a 6.82% efficient CZTSSe solar cell on F:SnO_(2)(FTO)substrate under the ambient condition.The composition gradient is realized by simply depositing the precursor inks with different Zn/Sn ratios.To verify that the high performance of the solar cell is attributed to the composition gradient strategy rather than the sole change of the Zn/Sn ratio,devices based on absorbers with varied Zn/Sn ratios are fabricated.Furthermore,the structure and surface morphology of the CZTSSe films with/without composition gradients are examined.The presence of elemental gradient through the depth of the CZTSSe films before and after annealing is confirmed by secondary ion mass spectroscopy analysis.It is found that the composition gradient enhances the crystallinity of the absorber,reduces the surface roughness as well as device parasitic losses,contributing to a higher fill factor,open-circuit voltage,and conversion efficiency.
