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A GaSb crystal incorporated with Mn has been grown by the Bridgman method on the Polizon facility onboard the FOTON-M3 spacecraft. Structural defects and growth striations have been successfully revealed by the chemical etching method. By calculating various parameters of the convection, the striation patterns can be explained, and the critical value of the Taylor number, which characterizes the convective condition of the rotating magnetic field induced azimuthal flow, was shown. The stresses generated during crystal growth can be reflected by the observations of etch pit distribution and other structural defects. Suggestions for improving the space experiment to improve the quality of the crystal are given. 相似文献
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本文用等效电流法将不规则的单模光纤看成是有源的理想光纤,求出极化电流场,并认为光纤损耗是由极化电流激发的准导模产生的。本文将准导模的概念用于等效电流法来求取单模光纤的模耦合损耗。这种方法脱离了耦合波的概念,但物理意义明确,方法简洁。 相似文献
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为了提高GaAs微型太阳电池的输出性能,对微型太阳电池阵列的主要工艺进行了研究和改进。通过对帽层、背电极层和台面的选择性/非选择性湿法腐蚀工艺的探索,实现了对最佳腐蚀液的配比、腐蚀时间和温度的控制。采用侧壁钝化工艺和聚酰亚氨(PI)/SiO2/TiAu/SiO2新型互连结构,不仅确保了电池单元之间有效的隔离和互连,而且极大地降低了侧壁载流子复合电流,同时这种新型互连结构可有效防止由于衬底光敏现象引起的漏电流。经过上述器件工艺改进,获得了高集成度GaAs微型太阳电池阵列。电流-电压(JSC-VOC)测试结果显示,器件的开路电压达到84.2V,填充因子为57%。 相似文献
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