Layer-Dependent Photoinduced Electron Transfer in 0D–2D Lead Sulfide/Cadmium Sulfide–Layered Molybdenum Disulfide Hybrids

Journal Article · Fri Jun 21 00:00:00 EDT 2019 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.9b04367· OSTI ID:1561252

Chen, Jia-Shiang  ^[1]; Li, Mingxing ^[2]; Wu, Qin  ^[2]; Fron, Eduard  ^[3]; Tong, Xiao ^[2]; Cotlet, Mircea  ^[2]

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1. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
2. Brookhaven National Lab. (BNL), Upton, NY (United States)
3. KU Leuven (Belgium)

We illustrate layer-dependent electron transfer between core/shell PbS/CdS quantum dots (QDs) and layered MoS₂ via energy bandgap engineering of both the donor (QDs) and the acceptor (MoS2) components. We do this by (i) changing the size of the QD or (ii) by changing the number of layers of MoS2 and each of these approaches alters the bandgap and/or the donor-acceptor separation distance, hence providing a mean 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 MoS₂ or thicker. We model this layer-dependent charge transfer rate with a theoretical model derived from Marcus theory previously applied to non-adiabatic electron transfer in weakly coupled systems by considering the QD transferring photogenerated electrons to non-interacting monolayers within a few layers MoS₂.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0012704; SC0014664
• OSTI ID: 1561252
• Report Number(s): BNL-212063-2019-JAAM
• Journal Information: ACS Nano, Vol. 13, Issue 7; ISSN 1936-0851
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

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