Transport Properties of a Two-Dimensional PbSe Square Superstructure in an Electrolyte-Gated Transistor

M. Alimoradi Jazi, V. A.E.C. Janssen, W. H. Evers, A. Tadjine, C Delerue, L. D.A. Siebbeles, H. S.J. Van Der Zant, A. J. Houtepen, D Vanmaekelbergh

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)
33 Downloads (Pure)

Abstract

Self-assembled nanocrystal solids show promise as a versatile platform for novel optoelectronic materials. Superlattices composed of a single layer of lead-chalcogenide and cadmium-chalcogenide nanocrystals with epitaxial connections between the nanocrystals, present outstanding questions to the community regarding their predicted band structure and electronic transport properties. However, the as-prepared materials are intrinsic semiconductors; to occupy the bands in a controlled way, chemical doping or external gating is required. Here, we show that square superlattices of PbSe nanocrystals can be incorporated as a nanocrystal monolayer in a transistor setup with an electrolyte gate. The electron (and hole) density can be controlled by the gate potential, up to 8 electrons per nanocrystal site. The electron mobility at room temperature is 18 cm2/(V s). Our work forms a first step in the investigation of the band structure and electronic transport properties of two-dimensional nanocrystal superlattices with controlled geometry, chemical composition, and carrier density.

Original languageEnglish
Pages (from-to)5238-5243
Number of pages6
JournalNano Letters: a journal dedicated to nanoscience and nanotechnology
Volume17
Issue number9
DOIs
Publication statusPublished - 13 Sep 2017

Keywords

  • 2D superstructure
  • electrolyte gating
  • optoelectrical characterization
  • oriented attachment
  • self-assembly

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