磷酸盐玻璃在光学领域有广泛的应用,然而因为简单的磷酸盐玻璃的化学稳定性和热机械性能较差,已经难以满足日益发展的激光装置的高性能要求。在磷酸盐玻璃中加入少量的硅可以形成六配位的硅网络体并且极大的改善这些性能。因此研究这种...磷酸盐玻璃在光学领域有广泛的应用,然而因为简单的磷酸盐玻璃的化学稳定性和热机械性能较差,已经难以满足日益发展的激光装置的高性能要求。在磷酸盐玻璃中加入少量的硅可以形成六配位的硅网络体并且极大的改善这些性能。因此研究这种磷硅酸盐玻璃的结构细节有重要的意义。但是由于玻璃结构缺乏长程有序,其结构研究比较复杂。现代固体核磁共振(NMR)技术能够从原子尺度对无序状态的物质局域结构进行解析,是一种强大的用来研究玻璃结构的技术手段。本文的目的是探究碱土金属对磷硅酸盐玻璃中六配位硅结构的影响。我们采用传统的熔融-冷却法制备了(2MO-3P2O5)(1−x)·(SiO2)x(M=Ca,Sr,Ba)体系的磷硅酸盐玻璃。并且运用先进的固体核磁共振技术和拉曼光谱对此磷硅酸盐玻璃结构进行了表征。31P和29Si MAS NMR表明其网络结构由磷氧四面体P(2)和P(3)与四配位和六配位的硅氧多面体相互连接构成,随着二氧化硅含量的增加六配位硅的比例呈现减少的趋势。类似地,在拉曼光谱的结构中和六配位硅相连的磷基团的峰也随着硅含量的增加而减弱。基于双量子相干和P-P同核间J耦合作用的重聚INADEQUATE实验证明了不同的磷氧四面体之间的连接情况,P(2)和P(3)两种结构单元在玻璃中是相对分离的,他们大多数都是与自身相连接。和之前报道的有关Na2OP2O5-SiO2体系的玻璃相比较,不同的是,在Na2O-P2O5-SiO2玻璃中一个P(3)结构单元最多有一个Si(6)-O-P(3)键,而对于本文的碱土金属磷硅酸盐玻璃一个P(3)结构单元最多有0.4–0.7个Si(6)-O-P(3)键。说明碱土金属比碱金属对六配位硅的稳定作用更弱一些。这种结构与组成之间的关系对设计玻璃组成和性质能提供重要的依据,尤其在大型的激光装置中对磷酸盐玻璃基质的化学和热稳定性有着很高的要求,详细的结构信息能为通过改变组成来提高善玻璃性能搭建桥梁。展开更多
The chemical compositions of Ag-Er co-doped phosphate and silicate glasses were investigated with X-ray photoelectron spectroscopy with the purpose to identify the chemical state of silver. The analysis of the Ag 3d c...The chemical compositions of Ag-Er co-doped phosphate and silicate glasses were investigated with X-ray photoelectron spectroscopy with the purpose to identify the chemical state of silver. The analysis of the Ag 3d core lines show the presence of nanometer-sized silver particles in each of the annealed samples,even if these Ag 3d lines appear to be very different from each other. We explain these results as a different interaction of silver with the two glasses matrix,which leads to a different nucleation rate of the Ag clusters.展开更多
Improving cell efficiency and increasing throughput in solar cell industry efforts were put on uniform texturization and optimum diffusion process. To reduce reflectivity, NaOH/KOH （sodium hydroxide/potassium hydrox...Improving cell efficiency and increasing throughput in solar cell industry efforts were put on uniform texturization and optimum diffusion process. To reduce reflectivity, NaOH/KOH （sodium hydroxide/potassium hydroxide） and IPA （isopropyl alcohol） are widely used in standard alkaline texturization of mono c-Si （crystalline silicon） （〈100〉 crystal orientation） wafers, where IPA promotes formation of uniform pyramidal structure but leads to unstable process. In this work, carbohydrates have been investigated as an additive in etchant solution. Moreover uniform phosphorus diffusion process for B2B （back to back） diffusion （loading two wafers in one single slot of quartz boat） has been investigated with single and multiple temperature plateaus. Impact of pre-oxygen step on phosphorus diffusion is investigated in which number of inactive phosphorus at the PSG （phosphosilicate glass）-Si interface is reduced. A batch of 156 PSQ （pseudo square） mono c-Si solar cells with 18%-18.20% efficiency was fabricated which is -0.3% higher than the standard process. The EL （electroluminescence image）, reff （carrier effective life time）, Voc （open circuit voltage）, Isc （short circuit current）, Pvk （peak power） and r/ （efficiency） have been examined and compared with standard.展开更多
文摘磷酸盐玻璃在光学领域有广泛的应用,然而因为简单的磷酸盐玻璃的化学稳定性和热机械性能较差,已经难以满足日益发展的激光装置的高性能要求。在磷酸盐玻璃中加入少量的硅可以形成六配位的硅网络体并且极大的改善这些性能。因此研究这种磷硅酸盐玻璃的结构细节有重要的意义。但是由于玻璃结构缺乏长程有序,其结构研究比较复杂。现代固体核磁共振(NMR)技术能够从原子尺度对无序状态的物质局域结构进行解析,是一种强大的用来研究玻璃结构的技术手段。本文的目的是探究碱土金属对磷硅酸盐玻璃中六配位硅结构的影响。我们采用传统的熔融-冷却法制备了(2MO-3P2O5)(1−x)·(SiO2)x(M=Ca,Sr,Ba)体系的磷硅酸盐玻璃。并且运用先进的固体核磁共振技术和拉曼光谱对此磷硅酸盐玻璃结构进行了表征。31P和29Si MAS NMR表明其网络结构由磷氧四面体P(2)和P(3)与四配位和六配位的硅氧多面体相互连接构成,随着二氧化硅含量的增加六配位硅的比例呈现减少的趋势。类似地,在拉曼光谱的结构中和六配位硅相连的磷基团的峰也随着硅含量的增加而减弱。基于双量子相干和P-P同核间J耦合作用的重聚INADEQUATE实验证明了不同的磷氧四面体之间的连接情况,P(2)和P(3)两种结构单元在玻璃中是相对分离的,他们大多数都是与自身相连接。和之前报道的有关Na2OP2O5-SiO2体系的玻璃相比较,不同的是,在Na2O-P2O5-SiO2玻璃中一个P(3)结构单元最多有一个Si(6)-O-P(3)键,而对于本文的碱土金属磷硅酸盐玻璃一个P(3)结构单元最多有0.4–0.7个Si(6)-O-P(3)键。说明碱土金属比碱金属对六配位硅的稳定作用更弱一些。这种结构与组成之间的关系对设计玻璃组成和性质能提供重要的依据,尤其在大型的激光装置中对磷酸盐玻璃基质的化学和热稳定性有着很高的要求,详细的结构信息能为通过改变组成来提高善玻璃性能搭建桥梁。
基金This work was partially supported by MIUR-FIRB (RBNE012N3X-005) and by PAT-FAPVU projects.
文摘The chemical compositions of Ag-Er co-doped phosphate and silicate glasses were investigated with X-ray photoelectron spectroscopy with the purpose to identify the chemical state of silver. The analysis of the Ag 3d core lines show the presence of nanometer-sized silver particles in each of the annealed samples,even if these Ag 3d lines appear to be very different from each other. We explain these results as a different interaction of silver with the two glasses matrix,which leads to a different nucleation rate of the Ag clusters.
文摘Improving cell efficiency and increasing throughput in solar cell industry efforts were put on uniform texturization and optimum diffusion process. To reduce reflectivity, NaOH/KOH （sodium hydroxide/potassium hydroxide） and IPA （isopropyl alcohol） are widely used in standard alkaline texturization of mono c-Si （crystalline silicon） （〈100〉 crystal orientation） wafers, where IPA promotes formation of uniform pyramidal structure but leads to unstable process. In this work, carbohydrates have been investigated as an additive in etchant solution. Moreover uniform phosphorus diffusion process for B2B （back to back） diffusion （loading two wafers in one single slot of quartz boat） has been investigated with single and multiple temperature plateaus. Impact of pre-oxygen step on phosphorus diffusion is investigated in which number of inactive phosphorus at the PSG （phosphosilicate glass）-Si interface is reduced. A batch of 156 PSQ （pseudo square） mono c-Si solar cells with 18%-18.20% efficiency was fabricated which is -0.3% higher than the standard process. The EL （electroluminescence image）, reff （carrier effective life time）, Voc （open circuit voltage）, Isc （short circuit current）, Pvk （peak power） and r/ （efficiency） have been examined and compared with standard.
