Long-time decay kinetics of geminate electron-hole pairs in donor-acceptor heterojunction systems

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• 作者：Mariusz Wojcik^a ; ^{mariusz.wojcik@mitr.p.lodz.pl} ; M. Tachiya^b ; ^{m.tachiya@aist.go.jp}
• 刊名：Chemical Physics Letters
• 出版年：2012
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：1 June, 2012
• 卷：537
• 期：Complete
• 页码：58-61
• 文件大小：330 K

摘要

We present an analytical theory of geminate charge recombination in donor-acceptor heterojunction systems based on the Smoluchowski equation. We show that the differential equation describing this problem is mathematically equivalent to that describing geminate recombination in a four-dimensional anisotropic system. By combining this result with already available analytical results for n-dimensional homogeneous systems, we predict that the survival probability of electron-hole pairs in heterojunction systems decays as t^鈭? at long times. We prove this by analyzing the results of kinetic Monte Carlo simulations. We also explain clearly why the ultimate escape probability is increased by introducing the heterojunction.