Influence of Interparticle Structure on the Steady-State and Transient Current within Arrays of Thiocyanate-Treated PbS Nanocubes

Martin R. McPhail, Emily A Weiss

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper describes the dependence of the DC conductivity, film charging dynamics, and transient photocurrent dynamics of quasi-two-dimensional arrays of thiocyanate-capped PbS nanocubes (NCs) on the edge length of the NC. Arrays were prepared monolayer-by-monolayer using self-assembly at a liquid-air interface. Across-film conductivity increases with NC size with a dependence consistent with a simple diffusional hopping model. Upon application of a constant source-drain bias, the measured dark current decays exponentially to a nonzero steady-state value as immobile hole traps fill. Illumination with 532-nm light produces a repeatable photoresponse, which also fits to an exponential function. The lifetimes associated with decay of the dark current and growth of the photocurrent both increase with increasing NC size. Comparison of the electrical data with electron microscopy images reveals that this trend is related to the connectivity of the percolation networks within the film, which depends on the interparticle order and, in turn, on the edge length of the NCs. Correlations between interparticle order and electrical properties are made possible by the highly ordered films that result from the liquid-air interface deposition method. (Graph Presented).

Original languageEnglish
Pages (from-to)5605-5613
Number of pages9
JournalChemistry of Materials
Volume27
Issue number16
DOIs
Publication statusPublished - Aug 25 2015

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Dark currents
Photocurrents
Monolayers
Hole traps
Exponential functions
Liquids
Air
Self assembly
Electron microscopy
Electric properties
Lighting
thiocyanate

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Influence of Interparticle Structure on the Steady-State and Transient Current within Arrays of Thiocyanate-Treated PbS Nanocubes. / McPhail, Martin R.; Weiss, Emily A.

In: Chemistry of Materials, Vol. 27, No. 16, 25.08.2015, p. 5605-5613.

Research output: Contribution to journalArticle

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