Layer-Dependent Photoinduced Electron Transfer in 0D-2D Lead Sulfide/Cadmium Sulfide-Layered Molybdenum Disulfide Hybrids.
basic_science · Level V
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- Record sourced from PubMed, PMID 31276367.
- Also identified by DOI 10.1021/acsnano.9b04367.
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Abstract
We demonstrate layer-dependent electron transfer between core/shell PbS/CdS quantum dots (QDs) and layered MoS<sub>2</sub> <i>via</i> energy band gap engineering of both the donor (QDs) and the acceptor (MoS<sub>2</sub>) components. We do this by (i) changing the size of the QD or (ii) by changing the number of layers of MoS<sub>2</sub>, and each of these approaches alters the band gap and/or the donor-acceptor separation distance, thus providing a means of tuning the charge-transfer rate. We find the charge-transfer rate to be maximal for QDs of smallest size and for QDs combined with a 5-layer MoS<sub>2</sub> or thicker. We model this layer-dependent charge-transfer rate with a theoretical model derived from Marcus theory previously applied to nonadiabatic electron transfer in weakly coupled systems by considering the QD transferring photogenerated electrons to noninteracting monolayers within a few layers of MoS<sub>2</sub>.