Highly Conductive Cu 2– x S Nanoparticle Films through Room-Temperature Processing and an Order of Magnitude Enhancement of Conductivity via Electrophoretic Deposition
KAUST Grant NumberKUS-C1-018-02
MetadataShow full item record
Abstract© 2014 American Chemical Society. A facile room-temperature method for assembling colloidal copper sulfide (Cu2-xS) nanoparticles into highly electrically conducting films is presented. Ammonium sulfide is utilized for connecting the nanoparticles via ligand removal, which transforms the as-deposited insulating films into highly conducting films. Electronic properties of the treated films are characterized with a combination of Hall effect measurements, field-effect transistor measurements, temperature-dependent conductivity measurements, and capacitance-voltage measurements, revealing their highly doped p-type semiconducting nature. The spin-cast nanoparticle films have carrier concentration of ∼1019 cm-3, Hall mobilities of ∼3 to 4 cm2 V-1 s-1, and electrical conductivities of ∼5 to 6 S·cm-1. Our films have hole mobilities that are 1-4 orders of magnitude higher than hole mobilities previously reported for heat-treated nanoparticle films of HgTe, InSb, PbS, PbTe, and PbSe. We show that electrophoretic deposition (EPD) as a method for nanoparticle film assembly leads to an order of magnitude enhancement in film conductivity (∼75 S·cm-1) over conventional spin-casting, creating copper sulfide nanoparticle films with conductivities comparable to bulk films formed through physical deposition methods. The X-ray diffraction patterns of the Cu2-xS films, with and without ligand removal, match the Djurleite phase (Cu1.94S) of copper sulfide and show that the nanoparticles maintain finite size after the ammonium sulfide processing. The high conductivities reported are attributed to better interparticle coupling through the ammonium sulfide treatment. This approach presents a scalable room-temperature route for fabricating highly conducting nanoparticle assemblies for large-area electronic and optoelectronic applications.
CitationOtelaja OO, Ha D-H, Ly T, Zhang H, Robinson RD (2014) Highly Conductive Cu 2– x S Nanoparticle Films through Room-Temperature Processing and an Order of Magnitude Enhancement of Conductivity via Electrophoretic Deposition . ACS Applied Materials & Interfaces 6: 18911–18920. Available: http://dx.doi.org/10.1021/am504785f.
SponsorsWe thank M. G. Spencer, J. Shu, S. Kriske, and K. Whitham for helpful discussions. The work was supported in part by the National Science Foundation under Agreement No. DMR-1149036, and in part by the Energy Materials Center at Cornell (EMC<SUP>2</SUP>), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Science under Award Number DE-SC0001086. O.O.O. was fully supported through the NSF (DMR-1149036). This work made use of the Cornell Center for Materials Research Shared Facilities, which are supported through the NSF MRSEC program (DMR-1120296). This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). Device fabrication was performed at the Cornell Nanoscale Facility, a member of the National Nanotechnology Infrastructure Network, which is supported by the National Science Foundation (Grant ECS-0335765).
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
- Cluster beam deposition of Cu(2-X)S nanoparticles into organic thin films.
- Authors: Majeski MW, Bolotin IL, Hanley L
- Issue date: 2014 Aug 13
- Low-temperature deposition of BaCuSF, a visible through mid-infrared p-type transparent conductor.
- Authors: Frantz JA, Nguyen VQ, Mäkinen AJ, Qadri SB, Myers JD, Sanghera JS
- Issue date: 2013 Dec 16
- Overcoming Film Quality Issues for Conjugated Polymers Doped with F4TCNQ by Solution Sequential Processing: Hall Effect, Structural, and Optical Measurements.
- Authors: Scholes DT, Hawks SA, Yee PY, Wu H, Lindemuth JR, Tolbert SH, Schwartz BJ
- Issue date: 2015 Dec 3
- A General Method for High-Performance Li-Ion Battery Electrodes from Colloidal Nanoparticles without the Introduction of Binders or Conductive-Carbon Additives: The Cases of MnS, Cu(2-x)S, and Ge.
- Authors: Ha DH, Ly T, Caron JM, Zhang H, Fritz KE, Robinson RD
- Issue date: 2015 Nov 18
- Thiocyanate-capped nanocrystal colloids: vibrational reporter of surface chemistry and solution-based route to enhanced coupling in nanocrystal solids.
- Authors: Fafarman AT, Koh WK, Diroll BT, Kim DK, Ko DK, Oh SJ, Ye X, Doan-Nguyen V, Crump MR, Reifsnyder DC, Murray CB, Kagan CR
- Issue date: 2011 Oct 5