The Enhancement of Interfacial Exciton Dissociation by Energetic Disorder Is a Nonequilibrium Effect.

ABSTRACT: 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. It has been observed previously that the presence of energetic disorder can lead to a reduction in recombination losses. Here we investigate this effect using a simple model of charge dynamics at a donor-acceptor interface. We consider the effect of spatial variations in electronic energy levels, such as those that arise in disordered molecular systems, on dissociation yield and demonstrate that it is maximized with a finite amount of disorder. We demonstrate that this is a nonequilibrium

SUBMITTER: Shi L 

PROVIDER: S-EPMC5746863 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature