能量无序增强界面激子解离是一种非平衡效应
The Enhancement of Interfacial Exciton Dissociation by Energetic Disorder is a Nonequilibrium Effect
摘要：
激发电子-空穴对的解离是一个微观过程，对光伏系统的性能至关重要。为了使该过程成功，带相反电荷的电子和空穴必须在它们经历基态复合之前克服静电结合能。在这里，我们使用一个简单的电荷动力学模型来研究分子无序在这个过程中的作用。该模型揭示了电子能级的适度空间变化，例如在无序分子系统中出现的那些，实际上可以增加电荷解离产率。我们证明，这是一个非平衡效应，介导的耗散驱动形成的部分解离的中间状态，是长寿的，因为他们不能很容易地重组。我们提出了一个动力学模型，将这些国家和表明，它是能够再现类似的行为时，它是参数化的非平衡速率。
英文摘要：
The dissociation of excited electron-hole pairs is a microscopic process that is fundamental to the performance of photovoltaic systems. For this process to be successful, the oppositely charged electron and hole must overcome an electrostatic binding energy before they undergo ground state recombination. Here we use a simple model of charge dynamics to investigate the role of molecular disorder in this process. This model reveals that moderate spatial variations in electronic energy levels, such as those that arise in disordered molecular systems, can actually increase charge dissociation yields. We demonstrate that this is a nonequilibrium effect that is mediated by the dissipation driven formation of partially dissociated intermediate states that are long-lived because they cannot easily recombine. We present a kinetic model that incorporates these states and show that it is capable of reproducing similar behavior when it is parameterized with nonequilibrium rates.
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