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E Center in Silicon Has a Donor Level in the Band Gap

机译:硅电子中心在带隙方面具有捐赠者水平

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摘要

It has been an accepted fact for more than 40 years that the E center in Si (the group-Ⅴ impurity— vacancy pair)—one of the most studied defects in semiconductors—has only one energy level in the band gap: namely, the acceptor level at about 0.45 eV below the conduction band. We now demonstrate that it has a second level, situated in the lower half of the band gap at 0.27 eV above the valence band. The existence of this level, having a donor character, is disclosed by a combination of different transient-capacitance techniques and electronic-structure calculations. The finding seriously questions some diffusion-modeling approaches performed in the past.
机译:40多年来,一个公认的事实是,Si(Ⅴ族杂质—空位对)中的E中心(半导体中研究最多的缺陷之一)在带隙中只有一个能级:受体水平在导带以下约0.45 eV。现在,我们证明它具有第二级,位于价带上方0.27 eV的带隙下半部分。通过结合不同的瞬态电容技术和电子结构计算,可以揭示具有供体特性的该能级的存在。这一发现严重质疑了过去执行的一些扩散建模方法。

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