研究了一种G aA s层结构在[110]方向外部单轴应力下基于光致发光(PL)谱的测试方法.层结构的应力由螺旋测微器施加,可以产生平面内的压(拉)应力和应变,大小可以由胡克定律算出.随着应力的增大,观察到了谱峰明显的蓝移.在一系列的加压后,...研究了一种G aA s层结构在[110]方向外部单轴应力下基于光致发光(PL)谱的测试方法.层结构的应力由螺旋测微器施加,可以产生平面内的压(拉)应力和应变,大小可以由胡克定律算出.随着应力的增大,观察到了谱峰明显的蓝移.在一系列的加压后,在1.432 eV,有一个新的峰出现在原有的峰的肩部附近,随着压力增加,两个峰逐渐分开.同时PL峰的半峰宽随着应力增加而逐渐加大.最后,本文根据实验结果分析了静水和单轴应力的不同.展开更多
This paper discusses the I-V property of the GaAs-based resonant tunnelling structure （RTS） under external uniaxial pressure by photoluminescence studies. Compressive pressure parallel to the [110] direction, whose ...This paper discusses the I-V property of the GaAs-based resonant tunnelling structure （RTS） under external uniaxial pressure by photoluminescence studies. Compressive pressure parallel to the [110] direction, whose value is determined by Hooke＇s law, is imposed on the sample by a helix micrometer. With the increase of the applied external uniaxial compressive pressure, the blue shift and splitting of the luminescence peaks were observed, which have some influence on the I-V curve of RTS from the point of view of the energy gap, and the splitting became more apparent with applied pressure. Full width at half maximum broadening could also be observed.展开更多
Several diamidodisilanes and azocyclosilane were prepared from the resultants of Wurtz coupling reaction between dichlorosilane and sodium and characterized by 1H NMR and FT-IR. The two split peaks of the stretching v...Several diamidodisilanes and azocyclosilane were prepared from the resultants of Wurtz coupling reaction between dichlorosilane and sodium and characterized by 1H NMR and FT-IR. The two split peaks of the stretching vibration bonds of Si-H bonds in compounds 1 and 3 were firstly found at ～2163 cm-1 and ～2100 cm-1 respectively. The density functional theory was adopted to calculate the several stable geometrical isomerism structures of compounds 1 and 3. The results of the calculations show that the peak split of Si-H bonds stretching vibration absorption was caused by the different geometrical isomers of the compounds and the calculated IR spectra of compounds 1 and 3 are much closer to the experimental results. The processes of hydrolysis and polycondensation reactions of the synthetic compounds were studied by FT-IR. At the same time, the transition of Si-H bonds split peaks was observed in this procedure. As the results of the hydrolysis and condensation reactions, a new type of organic silicon polymer, polyoxydisilane was obtained, which presents the photoluminescence of the polysilanes.展开更多
文摘研究了一种G aA s层结构在[110]方向外部单轴应力下基于光致发光(PL)谱的测试方法.层结构的应力由螺旋测微器施加,可以产生平面内的压(拉)应力和应变,大小可以由胡克定律算出.随着应力的增大,观察到了谱峰明显的蓝移.在一系列的加压后,在1.432 eV,有一个新的峰出现在原有的峰的肩部附近,随着压力增加,两个峰逐渐分开.同时PL峰的半峰宽随着应力增加而逐渐加大.最后,本文根据实验结果分析了静水和单轴应力的不同.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 50775209 and 50730009)
文摘This paper discusses the I-V property of the GaAs-based resonant tunnelling structure （RTS） under external uniaxial pressure by photoluminescence studies. Compressive pressure parallel to the [110] direction, whose value is determined by Hooke＇s law, is imposed on the sample by a helix micrometer. With the increase of the applied external uniaxial compressive pressure, the blue shift and splitting of the luminescence peaks were observed, which have some influence on the I-V curve of RTS from the point of view of the energy gap, and the splitting became more apparent with applied pressure. Full width at half maximum broadening could also be observed.
基金This work was supported by the Key Science and Technology Project of Shanghai(Grant No.02dzI1002).
文摘Several diamidodisilanes and azocyclosilane were prepared from the resultants of Wurtz coupling reaction between dichlorosilane and sodium and characterized by 1H NMR and FT-IR. The two split peaks of the stretching vibration bonds of Si-H bonds in compounds 1 and 3 were firstly found at ～2163 cm-1 and ～2100 cm-1 respectively. The density functional theory was adopted to calculate the several stable geometrical isomerism structures of compounds 1 and 3. The results of the calculations show that the peak split of Si-H bonds stretching vibration absorption was caused by the different geometrical isomers of the compounds and the calculated IR spectra of compounds 1 and 3 are much closer to the experimental results. The processes of hydrolysis and polycondensation reactions of the synthetic compounds were studied by FT-IR. At the same time, the transition of Si-H bonds split peaks was observed in this procedure. As the results of the hydrolysis and condensation reactions, a new type of organic silicon polymer, polyoxydisilane was obtained, which presents the photoluminescence of the polysilanes.
