分子光电二极管中的瞬态电流
Transient currents in a molecular photo-diode
摘要：
在HOMO-LUMO模型的框架下，采用动力学描述，研究了分子结（分子二极管）中的光致电荷传输。表达的顺序（跳跃）和直接（隧穿）瞬态电流分量连同动力学方程的中性和带电的分子状态，参与电流的形成与时间相关的人口。详细分析了谐振和非谐振电荷传输过程。它表明，瞬态电流与分子的充电过程，这是由光激发的分子启动。如果分子与电极的耦合是强烈不对称的，则瞬态电流可以显著超过稳态电流。
英文摘要：
Light-induced charge transmission through a molecular junction (molecular diode) is studied in the framework of a HOMO-LUMO model and in using a kinetic description. Expressions are presented for the sequential (hopping) and direct (tunneling) transient current components together with kinetic equations governing the time-dependent populations of the neutral and charged molecular states which participate in the current formation. Resonant and off-resonant charge transmission processes are analyzed in detail. It is demonstrated that the transient currents are associated with a molecular charging process which is initiated by photo excitation of the molecule. If the coupling of the molecule to the electrodes is strongly asymmetric the transient currents can significantly exceed the steady state current.
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