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通过第一性原理对平面内双轴应力作用下的单层黑磷能带结构进行了计算.双轴拉伸应力作用下单层黑磷始终保持直接带隙性质,双轴压缩应力作用下的单层黑磷则发生了直接带隙转变为间接带隙的现象,当双轴压缩应力增加到7%时单层黑磷带隙闭合. 相似文献
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In this paper, we design and fabricate a silicon integrated optical filter consisting of two cascaded micro-ring resonators and two straight waveguides. Two micro-heaters are fabricated on the top of two micro-rings respectively, which are employed to modulate the micro-rings to perform the function of a tunable optical filter by the thermo–optic effect. The static response test indicates that the extinction ratio and 3-d B bandwidth are 29.01 d B and 0.21 nm respectively, the dynamic response test indicates that the 10%–90% rise and 90%–10% fall time of the filter are 16 μs and 12 μs, respectively,which can meet the requirements of optical communication and information processing. Finally, the power consumption of the device is also characterized, and the total power consumption is about 9.43 m W/nm, which has been improved efficiently. 相似文献
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Silicon p–i–n diodes with different i-region widths are fabricated and tested. It is found that the current shows the non-monotonic behavior as a function of i-region width at a bias voltage of 1.0 V. In this paper, an analytical model is presented to explain the non-monotonic behavior, which mainly takes into account the diffusion current and recombination current contributing to the total current. The calculation results indicate that the concentration ratio of p-region to n-region plays a crucial role in the non-monotonic behavior, and the carrier lifetime also has a great influence on this abnormal phenomenon. 相似文献
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XPS研究聚苯胺的竞争掺杂行为 总被引:1,自引:0,他引:1
采用X射线光电子能谱(XPS)方法对不同反应体系下化学合成的聚苯胺(PANI)的结构和掺杂状况进行了研究。发现盐酸(HCl)掺杂的聚苯胺在样品后处理过程中易发生脱掺杂行为;在十二烷基苯磺酸钠(SDBS)和盐酸共存体系下合成聚苯胺时,对阴离子DBS-和Cl-发生竞争掺杂行为。结果表明DBS-与带正电荷聚苯胺链结合,起到了掺杂和诱导聚苯胺可溶性的作用,它的N1s和S2p谱图与单独采用十二烷基苯磺酸(DBSA)掺杂聚苯胺的谱图相似。但SDBS-HCl复合体系比单独采用DBSA体系更为有利。 相似文献
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