Liquid phase epitaxy （LPE） is a mature technology. Early experiments on single magnetic crystal films fabricated by LPE were focused mainly on thick films for microwave and magneto-optical devices. The LPE is an exc...Liquid phase epitaxy （LPE） is a mature technology. Early experiments on single magnetic crystal films fabricated by LPE were focused mainly on thick films for microwave and magneto-optical devices. The LPE is an excellent way to make a thick film, low damping magnetic garnet film and high-quality magneto-optical material. Today, the principal challenge in the applied material is to create sub-micrometer devices by using modern photolithography technique. Until now the magnetic garnet films fabricated by LPE still show the best quality even on a nanoscale （about 100 nm）, which was considered to be impossible for LPE method.展开更多
The novel bismuth-substituted rare earth iron garnet films were grown by the modified liquid phase epitaxy (LPE) technique for use as a 45° faraday rotator in optical isolators. First,single crystals of Y_3Fe_5O_...The novel bismuth-substituted rare earth iron garnet films were grown by the modified liquid phase epitaxy (LPE) technique for use as a 45° faraday rotator in optical isolators. First,single crystals of Y_3Fe_5O_(12) (YIG),with a lattice constant of 1.2378 nm,were grown by means of the Czochralski method. Using YIG instead of the conventional non-magnetic garnet of Gd_3Ga_5O_(12) (GGG) as a substrate,a film of BiYbIG was grown by means of the LPE method from Bi_2O_3-B_2O_3 fluxes. The structural,magnetic and magneto-optical properties of BiYbIG LPE film/YIG crystal composite were investigated using X-ray diffraction (XRD),electron probe microanalysis (EPMA),vibrating sample magnetometry (VMS) and near-infrared transmission spectrometry. The saturation magnetization 4π M _s was estimated to be about 1200 G. The Faraday rotation spectrum was measured by the method of rotating analyzer ellipsometry (RAE) with the wavelength varied from 800 to 1700 nm. The resultant Bi_(0.37)Yb_(2.63)Fe_5O_(12) LPE film/YIG crystal composite shows an increased Faraday rotation coefficient due to doping Bi (3+) ions on the dodecahedral sites of the magnetic garnet without increasing absorption loss,therefore a good magneto-optic figure of merit,defined by the ratio of Faraday rotation and optical absorption loss,can achieved of 21.5 and 30.2 °/dB at 1300 and 1550 nm wavelengths respectively at room temperature. Since Yb (3+) ions and Y (3+) ions provide the opposite contributes to the wideband and temperature characteristics of Faraday rotation,the values of Faraday rotation wavelength and temperature coefficients are reduced to 0.06%/nm and 0 007 °·℃ (-1) at 1550 nm wavelength,respectively.展开更多
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
基金Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0300801)the National Natural Science Foundation of China(Grant Nos.51702042,61734002,61571079,51572042,and 61471096)+1 种基金the International Science&Technology Cooperation Program of China(Grant No.2015DFR50870)the Sichuan Science and Technology Support Project,China(Grant Nos.2016GZ0250 and 2017JY0002)
文摘Liquid phase epitaxy （LPE） is a mature technology. Early experiments on single magnetic crystal films fabricated by LPE were focused mainly on thick films for microwave and magneto-optical devices. The LPE is an excellent way to make a thick film, low damping magnetic garnet film and high-quality magneto-optical material. Today, the principal challenge in the applied material is to create sub-micrometer devices by using modern photolithography technique. Until now the magnetic garnet films fabricated by LPE still show the best quality even on a nanoscale （about 100 nm）, which was considered to be impossible for LPE method.
文摘The novel bismuth-substituted rare earth iron garnet films were grown by the modified liquid phase epitaxy (LPE) technique for use as a 45° faraday rotator in optical isolators. First,single crystals of Y_3Fe_5O_(12) (YIG),with a lattice constant of 1.2378 nm,were grown by means of the Czochralski method. Using YIG instead of the conventional non-magnetic garnet of Gd_3Ga_5O_(12) (GGG) as a substrate,a film of BiYbIG was grown by means of the LPE method from Bi_2O_3-B_2O_3 fluxes. The structural,magnetic and magneto-optical properties of BiYbIG LPE film/YIG crystal composite were investigated using X-ray diffraction (XRD),electron probe microanalysis (EPMA),vibrating sample magnetometry (VMS) and near-infrared transmission spectrometry. The saturation magnetization 4π M _s was estimated to be about 1200 G. The Faraday rotation spectrum was measured by the method of rotating analyzer ellipsometry (RAE) with the wavelength varied from 800 to 1700 nm. The resultant Bi_(0.37)Yb_(2.63)Fe_5O_(12) LPE film/YIG crystal composite shows an increased Faraday rotation coefficient due to doping Bi (3+) ions on the dodecahedral sites of the magnetic garnet without increasing absorption loss,therefore a good magneto-optic figure of merit,defined by the ratio of Faraday rotation and optical absorption loss,can achieved of 21.5 and 30.2 °/dB at 1300 and 1550 nm wavelengths respectively at room temperature. Since Yb (3+) ions and Y (3+) ions provide the opposite contributes to the wideband and temperature characteristics of Faraday rotation,the values of Faraday rotation wavelength and temperature coefficients are reduced to 0.06%/nm and 0 007 °·℃ (-1) at 1550 nm wavelength,respectively.
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。
