CIGS thin films are deposited by sputtering and selenization, The synthesis of semiconducting polycrystalline thin films and characteristics of devices based on the CIGS absorbing layers are investigated. Their micros...CIGS thin films are deposited by sputtering and selenization, The synthesis of semiconducting polycrystalline thin films and characteristics of devices based on the CIGS absorbing layers are investigated. Their microstructures are characterized by x-ray diffraction and Raman spectroscopy, The results reveal that there exist metallic Cu2-xSe compounds in CIGS film surfaces and the compounds are thought to be responsible for the degradation of the open circuit voltage of solar cells. The optimization of selenization temperature profile and copper content in the precursor surfaces is studied, concluding that the conversion efficiency may be improved by removing metallic Cu2-xSe compounds from the surfaces of CIGS thin films.展开更多
The temperature dependences of upper critical field(Hc2) for a series of iron-deficient Fe1-xSe single crystals are obtained from the measurements of in-plane resistivity in magnetic fields up to 9 T and perpendicular...The temperature dependences of upper critical field(Hc2) for a series of iron-deficient Fe1-xSe single crystals are obtained from the measurements of in-plane resistivity in magnetic fields up to 9 T and perpendicular to the ab plane. For the samples with lower superconducting transition temperature Tc(< 7.2 K), the temperature dependence of Hc2 is appropriately described by an effective two-band model. For the samples with higher Tc( 7.2 K), the temperature dependence can also be fitted by a single-band Werthamer–Helfand–Hohenberg formula, besides the two-band model. Such a Tc-dependent change in Hc2(T) behavior is discussed in connection with recent related experimental results, showing an inherent link between the changes of intrinsic superconducting and normal state properties in the Fe Se system.展开更多
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
文摘CIGS thin films are deposited by sputtering and selenization, The synthesis of semiconducting polycrystalline thin films and characteristics of devices based on the CIGS absorbing layers are investigated. Their microstructures are characterized by x-ray diffraction and Raman spectroscopy, The results reveal that there exist metallic Cu2-xSe compounds in CIGS film surfaces and the compounds are thought to be responsible for the degradation of the open circuit voltage of solar cells. The optimization of selenization temperature profile and copper content in the precursor surfaces is studied, concluding that the conversion efficiency may be improved by removing metallic Cu2-xSe compounds from the surfaces of CIGS thin films.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11888101 and 11834016)the National Key Research and Development Program of China(Grant Nos.2017YFA0303003 and 2016YFA0300300)the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(Grant Nos.QYZDY-SSW-SLH001 and XDB25000000)
文摘The temperature dependences of upper critical field(Hc2) for a series of iron-deficient Fe1-xSe single crystals are obtained from the measurements of in-plane resistivity in magnetic fields up to 9 T and perpendicular to the ab plane. For the samples with lower superconducting transition temperature Tc(< 7.2 K), the temperature dependence of Hc2 is appropriately described by an effective two-band model. For the samples with higher Tc( 7.2 K), the temperature dependence can also be fitted by a single-band Werthamer–Helfand–Hohenberg formula, besides the two-band model. Such a Tc-dependent change in Hc2(T) behavior is discussed in connection with recent related experimental results, showing an inherent link between the changes of intrinsic superconducting and normal state properties in the Fe Se system.
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。
