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Carrier multiplication in van der Waals layered transition metal dichalcogenides.


ABSTRACT: Carrier multiplication (CM) is a process in which high-energy free carriers relax by generation of additional electron-hole pairs rather than by heat dissipation. CM is promising disruptive improvements in photovoltaic energy conversion and light detection technologies. Current state-of-the-art nanomaterials including quantum dots and carbon nanotubes have demonstrated CM, but are not satisfactory owing to high-energy-loss and inherent difficulties with carrier extraction. Here, we report CM in van der Waals (vdW) MoTe2 and WSe2 films, and find characteristics, commencing close to the energy conservation limit and reaching up to 99% CM conversion efficiency with the standard model. This is demonstrated by ultrafast optical spectroscopy with independent approaches, photo-induced absorption, photo-induced bleach, and carrier population dynamics. Combined with a high lateral conductivity and an optimal bandgap below 1?eV, these superior CM characteristics identify vdW materials as an attractive candidate material for highly efficient and mechanically flexible solar cells in the future.

SUBMITTER: Kim JH 

PROVIDER: S-EPMC6889496 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Carrier multiplication in van der Waals layered transition metal dichalcogenides.

Kim Ji-Hee JH   Bergren Matthew R MR   Park Jin Cheol JC   Adhikari Subash S   Lorke Michael M   Frauenheim Thomas T   Choe Duk-Hyun DH   Kim Beom B   Choi Hyunyong H   Gregorkiewicz Tom T   Lee Young Hee YH  

Nature communications 20191202 1


Carrier multiplication (CM) is a process in which high-energy free carriers relax by generation of additional electron-hole pairs rather than by heat dissipation. CM is promising disruptive improvements in photovoltaic energy conversion and light detection technologies. Current state-of-the-art nanomaterials including quantum dots and carbon nanotubes have demonstrated CM, but are not satisfactory owing to high-energy-loss and inherent difficulties with carrier extraction. Here, we report CM in  ...[more]

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