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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Photoelectric response of localized states in silica glass
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Photoelectric response of localized states in silica glass

机译：二氧化硅玻璃局部状态的光电响应

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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.
机译：研究了由准分子激光器激发的纯二氧化硅玻璃的光电响应。样品在各种条件下进行。由于凹陷效应，样品的光电偏振已经注册。在空间充电有限电流的条件下记录信号。由捕获电子和孔产生的空间电荷产生静电场，防止释放的电荷载体的扩散。尽管存在相磷施复，但外部电路的当前注册停止。这种效果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。已选择屏幕以防止杂散信号的影响。已经发现，当在二氧化硅的局部状态的光谱吸收范围中激发时，释放电荷载体。基于折叠效果，光电响应的符号显示了电荷载体的类型 - 电子或孔是移动的。因此，含有没有碱离子的铝的样品给出负信号，表示电子在290 k处的扩散，因为铝是有效的孔阱。在290k时的缺氧样品提供了指示孔的扩散的正信号，因为缺氧中心是有效的电子捕集器。由于孔的有效自捕集，该样品在100 k下提供负信号。

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