Photoinduced volume changes in amorphous selenium.
Photoinduced volume changes in amorphous selenium.
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DOI：
10.1103/physrevlett.95.206803
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发表时间：
2005-11
影响因子：
8.6
通讯作者：
J. Hegedüs;K. Kohary;D. Pettifor;K. Shimakawa;S. Kugler
中科院分区：
文献类型：
--
作者：
J. Hegedüs;K. Kohary;D. Pettifor;K. Shimakawa;S. Kugler
我们模拟了非晶硒的光致体积变化。在光子吸收后，我们在紧束缚形式主义的框架内独立地处理激发的电子和空穴。我们发现共价键断裂的无定形网络与光诱导激发电子，而激发空穴有助于链间键的形成。我们还观察到一个相关的体积变化的无定形样品。我们的结果提供了一个新的和普遍的描述，它可以同时解释光致体积膨胀和收缩。这个模型是支持最近的原位表面高度测量无定形硒。
We have modeled the photoinduced volume change in amorphous selenium. After photon absorption, we treated the excited electron and hole independently within the framework of the tight-binding formalism. We found covalent bond breaking in amorphous networks with photoinduced excited electrons, whereas excited holes contribute to the formation of interchain bonds. We also observed a correlated volume change of the amorphous samples. Our results provide a new and universal description, which can simultaneously explain the photoinduced volume expansion and shrinkage. This model is supported by very recent in situ surface height measurements for amorphous selenium.