Air-Stable and Efficient PbSe Quantum-Dot Solar Cells Based upon ZnSe to PbSe Cation-Exchanged Quantum Dots

Sungwoo Kim, Ashley R. Marshall, Daniel M. Kroupa, Elisa M. Miller, Joseph M. Luther, Sohee Jeong, Matthew C. Beard

Research output: Contribution to journalArticlepeer-review

100 Scopus Citations

Abstract

We developed a single step, cation-exchange reaction that produces air-stable PbSe quantum dots (QDs) from ZnSe QDs and PbX2 (X = Cl, Br, or I) precursors. The resulting PbSe QDs are terminated with halide anions and contain residual Zn cations. We characterized the PbSe QDs using UV-vis-NIR absorption, photoluminescence quantum yield spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Solar cells fabricated from these PbSe QDs obtained an overall best power conversion efficiency of 6.47% at one sun illumination. The solar cell performance without encapsulation remains unchanged for over 50 days in ambient conditions; and after 50 days, the National Renewable Energy Laboratory certification team certified the device at 5.9%. (Graph Presented).

Original languageAmerican English
Pages (from-to)8157-8164
Number of pages8
JournalACS Nano
Volume9
Issue number8
DOIs
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-64134

Keywords

  • cation exchange
  • halide passivation
  • PbSe QDs
  • quantum dots (QD)
  • solar cells

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