Charge Recombination Suppressed by Destructive Quantum Interference in Heterojunction Materials

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• 作者：Roel Tempelaar ; L. Jan Anton Koster ; Remco W. A. Havenith ; Jasper Knoester ; Thomas L. C. Jansen
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：January 7, 2016
• 年：2016
• 卷：7
• 期：1
• 页码：198-203
• 全文大小：360K
• ISSN：1948-7185

文摘

We show that charge recombination in ordered heterojunctions depends sensitively on the degree of coherent delocalization of charges at the donor–acceptor interface. Depending on the relative sign of the electron and hole transfer integrals, such delocalization can dramatically suppress recombination through destructive quantum interference. This could explain why measured recombination rates are significantly lower than predictions based on Langevin theory for a variety of organic bulk heterojunctions. Moreover, it opens up a design strategy for photovoltaic devices with enhanced efficiencies through coherently suppressed charge recombination.