Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots

Jianbing Zhang, Ryan W. Crisp, Jianbo Gao, Daniel M. Kroupa, Matthew C. Beard, Joseph M. Luther

Research output: Contribution to journalArticlepeer-review

105 Scopus Citations

Abstract

Decreasing the variability in quantum dot (QD) syntheses is desirable for better uniformity of samples for use in QD-based studies and applications. Here we report a highly reproducible linear relationship between the concentration of ligand (in this case oleic acid, OA) and the lowest energy exciton peak position (nm) of the resulting PbS QDs for various hot-injection temperatures. Thus, for a given injection temperature, the size of the PbS QD product is purely controlled by the amount of OA. We used this relationship to study PbS QD solar cells that are fabricated from the same size of PbS QDs but synthesized using four different injection temperatures: 95, 120, 150, and 185 C. We find that the power conversion efficiency does not depend on injection temperature but that the Voc is higher for QDs synthesized at lower temperatures while the Jsc is improved in higher temperature QDs. (Graph Presented).

Original languageAmerican English
Pages (from-to)1830-1833
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume6
Issue number10
DOIs
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-64079

Keywords

  • ligands
  • nanocrystals
  • oleic acid
  • photovoltaics (PV)
  • solar cells

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