为寻求以低成本制备n型太阳电池的pn结,进行了Al-17.6wt%Si合金熔体中(001)n型单晶硅衬底上液相外延生长p型掺杂硅实验。所用方法为垂直浸渍法,实验了过冷恒温生长与回熔处理后连续冷却生长两种模式,过程中体系以流动高纯氩保护。对所...为寻求以低成本制备n型太阳电池的pn结,进行了Al-17.6wt%Si合金熔体中(001)n型单晶硅衬底上液相外延生长p型掺杂硅实验。所用方法为垂直浸渍法,实验了过冷恒温生长与回熔处理后连续冷却生长两种模式,过程中体系以流动高纯氩保护。对所得外延生长晶体结构、形貌及所得pn结开路电压进行了分析和测定。结果显示,合金熔体中硅晶体(001)液相外延生长能够实现,但一般呈离散分布的金字塔型岛状生长;只有衬底回熔处理后原位连续降温生长模式可获得连续外延薄膜,之后在其上出现岛状生长,呈现Stranski-Krastanov生长模式。所得连续外延薄膜形成的pn结开路电压比恒温生长所得的提升约100 m V;连续外延薄膜形成后期出现的岛状生长使开路电压明显下降;生长速度提高会使连续降温外延生长pn结开路电压略有降低。展开更多
The melt treatment of A1-7%Si alloy by the flux injection method in a resistance furnance was investigated. The experimental results show that the flux injection method can realize the melt treatment of A1-7%Si alloy....The melt treatment of A1-7%Si alloy by the flux injection method in a resistance furnance was investigated. The experimental results show that the flux injection method can realize the melt treatment of A1-7%Si alloy. In purification, the flux injection method is superior to the standard lance degassing method. For the injection flux, the purifier Na2SiF6 is more powerful than Na3A1F6, the modifiers SrCl2, and R.E. Cl3 are quick acting, like NaF, but less powerful, the grain refiner containing K2TiF6 and KBF4 with Ti/B=1 is more potent than that with Ti/B=5. The analytical results indicate that the mass-transfer rate for the flux injection method is much higher than that for the conventional method .展开更多
Based on SIMA, the Al-Si alloy semi-solid billets were successfully fabricated by means of strain inducement and isothermal treatment for AlSi9Mg poured in the range of near-liquidus. Through orthogonal test, the effe...Based on SIMA, the Al-Si alloy semi-solid billets were successfully fabricated by means of strain inducement and isothermal treatment for AlSi9Mg poured in the range of near-liquidus. Through orthogonal test, the effects of combination action of near-liquidus casting, strain inducement and isothermal treatment on the morphology of primaryα-Al phase of AlSi9Mg close to eutectic point were investigated, and the optimal match relation between the processing parameters of solidification, deformation parameters of strain inducement, processing parameters of isothermal treatment and microstructure parameters of semi-solid alloy was established. The results indicate that compared with the single near-liquidus casting or SIMA, the microstructure of primaryα-Al phase in AlSi9Mg alloy prepared by compound fabrication process is more homogeneous, with more globular and finer particles, which has average grain size of 40-50 urn and shape factor of greater than 0.75. After holding at 605℃for 30-40 min under a certain cooling rate, increased deformation volume in SIMA benefits the refinement of the grain and the improvement of the morphology for primary phase.展开更多
文摘为寻求以低成本制备n型太阳电池的pn结,进行了Al-17.6wt%Si合金熔体中(001)n型单晶硅衬底上液相外延生长p型掺杂硅实验。所用方法为垂直浸渍法,实验了过冷恒温生长与回熔处理后连续冷却生长两种模式,过程中体系以流动高纯氩保护。对所得外延生长晶体结构、形貌及所得pn结开路电压进行了分析和测定。结果显示,合金熔体中硅晶体(001)液相外延生长能够实现,但一般呈离散分布的金字塔型岛状生长;只有衬底回熔处理后原位连续降温生长模式可获得连续外延薄膜,之后在其上出现岛状生长,呈现Stranski-Krastanov生长模式。所得连续外延薄膜形成的pn结开路电压比恒温生长所得的提升约100 m V;连续外延薄膜形成后期出现的岛状生长使开路电压明显下降;生长速度提高会使连续降温外延生长pn结开路电压略有降低。
文摘The melt treatment of A1-7%Si alloy by the flux injection method in a resistance furnance was investigated. The experimental results show that the flux injection method can realize the melt treatment of A1-7%Si alloy. In purification, the flux injection method is superior to the standard lance degassing method. For the injection flux, the purifier Na2SiF6 is more powerful than Na3A1F6, the modifiers SrCl2, and R.E. Cl3 are quick acting, like NaF, but less powerful, the grain refiner containing K2TiF6 and KBF4 with Ti/B=1 is more potent than that with Ti/B=5. The analytical results indicate that the mass-transfer rate for the flux injection method is much higher than that for the conventional method .
基金Project(04044058) supported by the Excellent Youths Science and Technology Foundation of Anhui, China
文摘Based on SIMA, the Al-Si alloy semi-solid billets were successfully fabricated by means of strain inducement and isothermal treatment for AlSi9Mg poured in the range of near-liquidus. Through orthogonal test, the effects of combination action of near-liquidus casting, strain inducement and isothermal treatment on the morphology of primaryα-Al phase of AlSi9Mg close to eutectic point were investigated, and the optimal match relation between the processing parameters of solidification, deformation parameters of strain inducement, processing parameters of isothermal treatment and microstructure parameters of semi-solid alloy was established. The results indicate that compared with the single near-liquidus casting or SIMA, the microstructure of primaryα-Al phase in AlSi9Mg alloy prepared by compound fabrication process is more homogeneous, with more globular and finer particles, which has average grain size of 40-50 urn and shape factor of greater than 0.75. After holding at 605℃for 30-40 min under a certain cooling rate, increased deformation volume in SIMA benefits the refinement of the grain and the improvement of the morphology for primary phase.
