Air-stable n-type colloidal quantum dot solids

Zhijun Ning, Oleksandr Voznyy, Jun Pan, Sjoerd H. Hoogland, Valerio Adinolfi, Jixian Xu, Min Li, Ahmad R. Kirmani, Jonpaul Sun, James C. Minor, Kyle W. Kemp, Haopeng Dong, Lisa R. Rollny, André J. Labelle, Graham H. Carey, Brandon R. Sutherland, Ian G. Hill, Aram Amassian, Huan Liu, Jiang TangOsman Bakr, E. H. Sargent

Research output: Contribution to journalArticlepeer-review

413 Scopus citations

Abstract

Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that require the creation of high-quality CQD solids that are controllably n-type (electron-rich) or p-type (hole-rich). Unfortunately, n-type semiconductors made using soft matter are notoriously prone to oxidation within minutes of air exposure. Here we report high-performance, air-stable n-type CQD solids. Using density functional theory we identify inorganic passivants that bind strongly to the CQD surface and repel oxidative attack. A materials processing strategy that wards off strong protic attack by polar solvents enabled the synthesis of an air-stable n-type PbS CQD solid. This material was used to build an air-processed inverted quantum junction device, which shows the highest current density from any CQD solar cell and a solar power conversion efficiency as high as 8%. We also feature the n-type CQD solid in the rapid, sensitive, and specific detection of atmospheric NO2. This work paves the way for new families of electronic devices that leverage air-stable quantum-tuned materials. © 2014 Macmillan Publishers Limited. All rights reserved.
Original languageEnglish (US)
Pages (from-to)822-828
Number of pages7
JournalNature Materials
Volume13
Issue number8
DOIs
StatePublished - Jun 8 2014

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)
  • Chemistry(all)
  • Mechanical Engineering
  • Condensed Matter Physics

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