Exciton dissociation and energy transfer at the quantized pentacenei lead-sulfide nanocrystal functional interface

Abstract

We investigated quantized-charge and energy transfer at the pentacene/lead sulfide (PbS) interface through realization of PbS nanocrystal (NC) size-dependent quantum confinement effect, providing insights into the presence of triplet exciton dissociation and energy transfer. With PbS nanocrystals (NCs) of a small size (similar to 3 nm), quantized charge and energy transfer at the pentacene/PbS NC interface leads to a large photocurrent while PbS NCs of a large size (similar to 7 nm) causes a far reduced photocurrent. Through comparison between the normal and inverted structures, importantly, exciton dissociation and energy transfer are turned out to be sensitive to subtle structural change at the interface. (C) 2017 Elsevier B.V. All rights reserved.