Charge Transport Modulation in PbSe Nanocrystal Solids by Au x Ag 1–x Nanoparticle Doping

Yang, Haoran; Wong, Eric; Zhao, Tianshuo; Lee, Jennifer D.; Xin, Huolin L.; Chi, Miaofang; Fleury, Blaise; Tang, Han-Yu; Gaulding, E. Ashley; Kagan, Cherie R.; Murray, Christopher B.

doi:10.1021/acsnano.8b03112

Title: Charge Transport Modulation in PbSe Nanocrystal Solids by Au _x Ag _1–x Nanoparticle Doping

Journal Article · Wed Aug 22 00:00:00 EDT 2018 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.8b03112· OSTI ID:1566358

; Wong, Eric; Zhao, Tianshuo;

;

^[1];

^[2]; Fleury, Blaise; Tang, Han-Yu; Gaulding, E. Ashley;

; Murray, Christopher B.

Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States

Nanocrystal (NC) solids are an exciting class of materials, whose physical properties are tunable by choice of the NCs as well as the strength of the interparticle coupling. One can consider these NCs as “artificial atoms” in analogy to the formation of condensed matter from atoms. Akin to atomic doping, the doping of a semiconducting NC solid with impurity NCs can drastically alter its electronic properties. A high degree of complexity is possible in these artificial structures by adjusting the size, shape, and composition of the building blocks, which enables “designer” materials with targeted properties. Here, we present the doping of the PbSe NC solids with a series of AuxAg1–x alloy nanoparticles (NPs). A combination of temperature-dependent electrical conductance and Seebeck coefficient measurements and room-temperature Hall effect measurements demonstrates that the incorporation of metal NPs both modifies the charge carrier density of the NC solids and introduces energy barriers for charge transport. These studies point to charge carrier injection from the metal NPs into the PbSe NC matrix. The charge carrier density and charge transport dynamics in the doped NC solids are adjustable in a wide range by employing the AuxAg1–x NP with different Au:Ag ratio as dopants. This doping strategy could be of great interest for thermoelectric applications taking advantage of the energy filtering effect introduced by the metal NPs.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP). Catalysis Center for Energy Innovation (CCEI); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC52-06NA25396; SC0001004

OSTI ID:: 1566358

Journal Information:: ACS Nano, Vol. 12, Issue 9; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

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Title: Charge Transport Modulation in PbSe Nanocrystal Solids by Au _x Ag _1–x Nanoparticle Doping