Dynamical study on polaron formation in a metal/polymer/metal structure

Dynamical study on polaron formation in a metal/polymer/metal structure
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金属/聚合物/金属结构中极化子形成的动力学研究

DOI:
10.1103/physrevb.68.125416
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发表时间:
2003-05
期刊:
Phys. Rev. B
影响因子:
--
通讯作者:
K. Nasu
K. Nasu
中科院分区:
其他
文献类型:
--
作者:
C. Q. Wu;Y. Qiu;Z. An;K. Nasu

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通过考虑一个紧密结合的一维模型中的金属/聚合物/金属结构,我们研究了电场存在下极化子的形成。当在其中一个金属电极上施加足够的电压偏置时,一个电子被注入聚合物链中,然后在几百飞秒内形成一个自捕获极化子,同时它在一个弱电场(不大于$1.0\ifmmode\times\else\texttimes\fi{}{4}\ mathm {V}/\ mathm {c}\ mathm {m})下缓慢移动。在$1.0\ifmmode\乘以\else\texttimes\fi{}{10}^{4}\ mathm {V}/\ mathm {c}\ mathm {m}$和$8.0\ifmmode\乘以\else\texttimes\fi{}{10}^{4}\ mathm {V}/\ mathm {c}\ mathm {m}之间的电场中,由于注入的电子在相当长的时间内被束缚在界面势阱之间,极化子仍然形成。结果表明,施加在聚合物链上的电场有效地降低了金属/聚合物界面中的势垒。
By considering a metal/polymer/metal structure within a tight-binding one-dimensional model, we have investigated the polaron formation in the presence of an electric field. When a sufficient voltage bias is applied to one of the metal electrodes, an electron is injected into the polymer chain, and then a self-trapped polaron is formed at a few hundreds of femtoseconds while it moves slowly under a weak electric field (not larger than $1.0\ifmmode\times\else\texttimes\fi{}{10}^{4}\mathrm{V}/\mathrm{c}\mathrm{m}).$ At an electric field between $1.0\ifmmode\times\else\texttimes\fi{}{10}^{4}\mathrm{V}/\mathrm{c}\mathrm{m}$ and $8.0\ifmmode\times\else\texttimes\fi{}{10}^{4}\mathrm{V}/\mathrm{c}\mathrm{m},$ the polaron is still formed, since the injected electron is bounded between the interface barriers for quite a long time. It is shown that the electric field applied at the polymer chain reduces effectively the potential barrier in the metal/polymer interface.
DOI: 10.1103/physrevb.54.r14321
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