One-Step Deposition of Photovoltaic Layers Using Iodide Terminated PbS Quantum Dots

Matthew Beard, Sungwoo Kim, Jaehong Noh, Hyekyoung Choi, Heonseok Ha, Jung Song, Hyung Shim, Jihoon Jang, Sohee Jeong

Research output: Contribution to journalArticlepeer-review

58 Scopus Citations

Abstract

We present a one-step layer deposition procedure employing ammonium iodide (NH4I) to achieve photovoltaic quality PbS quantum dot (QD) layers. Ammonium iodide is used to replace the long alkyl organic native ligands binding to the QD surface resulting in iodide terminated QDs that are stabilized in polar solvents such as N,N-dimethylformamide without particle aggregation. We extensively characterized the iodide terminated PbS QD via UV-vis absorption, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), FT-IR transmission spectroscopy, and X-ray photoelectron spectroscopy (XPS). Finally, we fabricated PbS QD photovoltaic cells that employ the iodide terminated PbS QDs. The resulting QD-PV devices achieved a best power conversion efficiency of 2.36% under ambient conditions that is limited by the layer thickness. The PV characteristics compare favorably to similar devices that were prepared using the standard layer-by-layer ethandithiol (EDT) treatment that had a similar layer thickness. (Chemical Equation Presented).

Original languageAmerican English
Pages (from-to)4002-4007
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume5
Issue number22
DOIs
StatePublished - 20 Nov 2014

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-62908

Keywords

  • Iodide
  • Layer-by-layer process
  • Ligand exchange
  • One-step deposition process
  • Quantum dot

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