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基于激子输运在聚合物给体/富勒烯(或非富勒烯)受体异质结太阳能电池光伏过程中的重要作用,本文结合最新的实验进展,从理论上提出了由非均匀场驱动的超快激子输运机制.动力学模拟采用扩展的一维Su-Schrieffer-Heeger紧束缚模型结合非绝热的量子动力学方法,而非均匀场主要考虑了由受限电荷诱导的非均匀电场和分子排列相关的非均匀构型场.研究发现:非均匀电场和构型场均可驱动激子实现超快输运,其输运速度比由传统的Forster或Dexter机制主导的激子输运可分别提高1和2个数量级.另外,本文重点分析了这两种非均匀场对激子输运的驱动机制,定量计算了它们各自诱导的驱动力.最后,针对影响这两种非均匀场分布的因素(包括受限电荷相对聚合物分子的距离和聚合物分子线性排列的斜率),讨论了它们对激子输运动力学的影响. 相似文献
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我从离开学校就业以来,就一直在施工企业的试验室工作,屈指算来已经十余年。十年间,除在本单位的试验室工作外还去过不少施工单位的试验室,以求他山之石可以功玉。总体看,大部分试验室的工作对施工之前的准备工作、施工中的质量控制、施工后的质量跟踪都起到了很好的参谋作用。但很多试验室却存在许多极待改进的问题,也因而有相当大的提升空间。 相似文献
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Dynamical study on charge injection and transport in a metal/polythiophene/metal structure 下载免费PDF全文
The dynamical process of charge injection from metal electrode to a nondegenerate polymer in a metal/polythiophene (PT)/metal structure has been investigated by using a nonadiabatic dynamic approach. It is found that the injected charges form wave packets due to the strong electron-lattice interaction in PT. We demonstrate that the dynamical formation of the wave packet sensitively depends on the strength of applied voltage, the electric field, and the contact between PT and electrode. At a strength of the electric field more than 3.0 × 10^4 V/cm, the carriers can be ejected from the PT into the right electrode. At an electric field more than 3.0 × 10^5 V/cm, the wave packet cannot form while it moves rapidly to the right PT/metal interface. It is shown that the ejected quantity of charge is noninteger. 相似文献
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歧义现象是一种重要的语言现象。本文分析不是由句法结构产生的、而是与语境有关的歧义现象,这种歧义离不开言语交际的环境。本文把语境分为狭义语境和广义语境。语境歧义的产生是话语的内容和不同语境因素共同作用于听读者的结果。歧义有时可能带来一些不利,但恰当使用语境歧义能收到幽默、讽刺、敷衍、醒目等积极效果。研究并巧妙运用语境歧义是必要而有益的。 相似文献
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Effect of temperature on the polaron stability in a one-dimensional organic lattice is investigated within the Su-Schrieffer-Heeger model. The temperature effect is simulated by introducing random forces to the equation of the lattice motion. It is found that the localized polaron state becomes delocalized even at low temperatures. The time of polaron keeping localized depends on the magnitude of temperatures. By taking into account the thermal effect, we find that the dissociation field is weaker as compared with earlier works. 相似文献
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We have studied the electric-field-driven motion of a polaron by solving the
time-dependent Schr\"{o}dinger equation nonadiabatically and the lattice
equation of motion simultaneously. It is found that the polaron may
experience two sequent transitions under high fields; one is the
transition from the subsonic to the supersonic state, and the other from the
supersonic to dissociated state. The acoustic mode is decoupled from the
charge when the polaron moves at a speed faster than the sound speed, and
then the optical mode is decoupled at the second transition to make the
polaron dissociate completely. 相似文献
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