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arXiv 2109.03036cond-mat.mtrl-sciphysics.app-ph
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石英玻璃中局域态的光电响应

Photoelectric response of localized states in silica glass

A. N. Trukhin

摘要:

本文研究了石英玻璃在准分子激光激发下的光电响应。样品在各种条件下制备。记录了由于Doppler效应引起的样品的光电极化。在空间电荷限制电流的条件下记录信号。由电子和空穴的捕获产生的空间电荷产生防止释放的载流子扩散的电场。尽管光激发继续,外部电路中的电流记录停止。该效应被用作测量样品体积中的光电流而不是与样品无关的寄生电流的事实。屏幕的选择是为了防止杂散信号的影响。已经发现,当在二氧化硅的定域态的光谱吸收范围内激发时,释放载流子。基于Doppler效应,光电响应的符号显示了载流子的类型-电子或空穴是移动的。因此,含有铝而没有碱金属离子的样品给出负信号,这表明在290 K下电子扩散,因为铝是有效的空穴陷阱。缺氧样品在290 K提供了一个积极的信号,表明空穴的扩散,因为缺氧的中心是一个有效的电子陷阱。该样品在100 K下由于空穴的有效自陷而提供负信号。

英文摘要:

The photoelectric response of pure silica glasses excited by excimer lasers has been studied. The samples were made under various conditions. Photoelectric polarization of samples due to the Dember effect has been registered. The signal was recorded under the conditions of a space charge limited current. The space charge resulting from the capture of electrons and holes creates a static electric field that prevents diffusion of released charge carriers. The current registration in the external circuit stops, despite the continuation of photoexcitation. This effect was used as a fact of measuring the photocurrent in the sample volume instead of the parasitic current that is not associated with the sample. The screen has been chosen to prevent the influence of a spurious signal. It has been found that charge carriers are released when excited in the spectral absorption range of localized states of silica. Based on the Dember effect, the sign of the photoelectric response shows the type of charge carriers - an electron or a hole is mobile. Thus, a sample containing aluminum without alkali ions gives a negative signal, which indicates the diffusion of electrons at 290 K, since aluminum is an effective hole trap. An oxygen-deficient sample at 290 K provides a positive signal indicating the diffusion of holes, because the center of oxygen deficiency is an effective electron trap. This sample at 100 K provides a negative signal due to the effective self-trapping of holes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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