Effect of Interlayer Coupling on Ultrafast Charge Transfer from Semiconducting Molecules to Mono- and Bilayer Graphene

Abstract

Single- and few-layer graphene have been used as electrodes in organic optoelectronic devices, however limited attention has been devoted to understanding and optimizing the transfer of excited electrons at the organic-graphene interface. The authors find that the charge-transfer rate depends on the number of graphene layers and their stacking, and can be explained by considering the electronic coupling between graphene layers. This work suggests clear ways to control the key process in this class of devices, which may see use as photodetectors or solar cells.