Highly effective surface passivation of pbse quantum dots through reaction with molecular chlorine

Wan Ki Bae, Jin Joo, Lazaro A. Padilha, Jonghan Won, Doh C. Lee, Qianglu Lin, Weon Kyu Koh, Hongmei Luo, Victor I Klimov, Jeffrey M. Pietryga

Research output: Contribution to journalArticle

150 Citations (Scopus)

Abstract

PbSe nanocrystal quantum dots (NQDs) are a promising active material for a range of optoelectronic devices, including solar cells, high-sensitivity infrared (IR) photodetectors, and IR-emitting diodes and lasers. However, device realization has been constrained by these NQDs chemical instability toward oxidation, which leads to uncontrollable changes in optical and electronic properties. Here, we present a simple method to enhance the stability of PbSe NQDs against oxidation and to improve their optical properties through reaction with molecular chlorine. The chlorine molecules preferentially etch out surface Se ions and react with Pb ions to form a thin (1-2 monolayers) PbClx passivation layer which effectively prevents oxidation during long-term air exposure while passivating surface trap states to increase photoluminescence efficiency and decrease photocharging. Our method is simple, widely applicable to PbSe and PbS NQDs of a range of sizes, compatible with solution-based processes for fabricating NQD-based devices, and effective both in solution and in solid NQD films; thus, it is a practical protocol for facilitating advances over the full range of optoelectronic applications.

Original languageEnglish
Pages (from-to)20160-20168
Number of pages9
JournalJournal of the American Chemical Society
Volume134
Issue number49
DOIs
Publication statusPublished - Dec 12 2012

Fingerprint

Quantum Dots
Chlorine
Passivation
Nanoparticles
Nanocrystals
Semiconductor quantum dots
Equipment and Supplies
Optoelectronic devices
Oxidation
Optical properties
Ions
Infrared radiation
Semiconductor Lasers
Plasma stability
Photodetectors
Electronic properties
lead selenide
Monolayers
Solar cells
Photoluminescence

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Bae, W. K., Joo, J., Padilha, L. A., Won, J., Lee, D. C., Lin, Q., ... Pietryga, J. M. (2012). Highly effective surface passivation of pbse quantum dots through reaction with molecular chlorine. Journal of the American Chemical Society, 134(49), 20160-20168. https://doi.org/10.1021/ja309783v

Highly effective surface passivation of pbse quantum dots through reaction with molecular chlorine. / Bae, Wan Ki; Joo, Jin; Padilha, Lazaro A.; Won, Jonghan; Lee, Doh C.; Lin, Qianglu; Koh, Weon Kyu; Luo, Hongmei; Klimov, Victor I; Pietryga, Jeffrey M.

In: Journal of the American Chemical Society, Vol. 134, No. 49, 12.12.2012, p. 20160-20168.

Research output: Contribution to journalArticle

Bae, WK, Joo, J, Padilha, LA, Won, J, Lee, DC, Lin, Q, Koh, WK, Luo, H, Klimov, VI & Pietryga, JM 2012, 'Highly effective surface passivation of pbse quantum dots through reaction with molecular chlorine', Journal of the American Chemical Society, vol. 134, no. 49, pp. 20160-20168. https://doi.org/10.1021/ja309783v
Bae, Wan Ki ; Joo, Jin ; Padilha, Lazaro A. ; Won, Jonghan ; Lee, Doh C. ; Lin, Qianglu ; Koh, Weon Kyu ; Luo, Hongmei ; Klimov, Victor I ; Pietryga, Jeffrey M. / Highly effective surface passivation of pbse quantum dots through reaction with molecular chlorine. In: Journal of the American Chemical Society. 2012 ; Vol. 134, No. 49. pp. 20160-20168.
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