Using persistent photoconductivity to write a low-resistance path in SrTiO(3).
Using persistent photoconductivity to write a low-resistance path in SrTiO(3).
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利用持久光电导率在 SrTiO(3) 中写入低电阻路径。
DOI：
10.1038/s41598-017-07090-2
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发表时间：
2017-07-27
影响因子：
4.6
通讯作者：
McCluskey MD
中科院分区：
文献类型：
--
作者：
Poole VM;Jokela SJ;McCluskey MD
具有持续光导电性（PPC）的材料在暴露于光下时电导率会增加，这种增加在光关闭后仍会持续。尽管研究人员已经证明这种现象可以用于新型记忆存储设备，但需要低温（低于180k）。本文在室温下对退火钛酸锶（SrTiO3， STO）单晶进行了两点电阻测量。经亚间隙光照射后，电阻降低了3个数量级。这种显著增强的电导率在黑暗中持续了数天。红外光谱、电学测量和405 nm激光照射的结果表明，接触电阻起着重要作用。然后，激光被用作“光学笔”，在两个触点之间书写低电阻路径，证明了光学定义的透明电子器件的可行性。
Materials with persistent photoconductivity (PPC) experience an increase in conductivity upon exposure to light that persists after the light is turned off. Although researchers have shown that this phenomenon could be exploited for novel memory storage devices, low temperatures (below 180 K) were required. In the present work, two-point resistance measurements were performed on annealed strontium titanate (SrTiO3, or STO) single crystals at room temperature. After illumination with sub-gap light, the resistance decreased by three orders of magnitude. This markedly enhanced conductivity persisted for several days in the dark. Results from IR spectroscopy, electrical measurements, and exposure to a 405 nm laser suggest that contact resistance plays an important role. The laser was then used as an “optical pen” to write a low-resistance path between two contacts, demonstrating the feasibility of optically defined, transparent electronics.
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