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Efficient and Stable PbS Quantum Dot Solar Cells by Triple-Cation Perovskite Passivation.

Authors
  • Albaladejo-Siguan, Miguel
  • Becker-Koch, David
  • Taylor, Alexander D
  • Sun, Qing
  • Lami, Vincent
  • Goldberg Oppenheimer, Pola
  • Paulus, Fabian
  • Vaynzof, Yana
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Nov 13, 2019
Identifiers
DOI: 10.1021/acsnano.9b05848
PMID: 31721556
Source
Medline
Language
English
License
Unknown

Abstract

Solution-processed quantum dots (QDs) have a high potential for fabricating low cost, flexible and large-scale solar energy harvesting devices. It has recently been demonstrated that hybrid devices employing a single monovalent cation perovskite solution for PbS QD surface passivation exhibit enhanced photovoltaic performance when compared to standard ligand passivation. Herein we demonstrate that the use of a triple cation Cs0.05(MA0.17FA0.83)0.95Pb(I0.9Br0.1)3 perovskite composition for surface passivation of the quantum dots results in highly efficient solar cells, which maintain 96 % of their initial performance after 1200h shelf storage. We confirm perovskite shell formation around the PbS nanocrystals by a range of spectroscopic techniques as well as high-resolution transmission electron microscopy. We find that the triple cation shell results in a favorable energetic alignment to the core of the dot, resulting in reduced recombination due to charge confinement without limiting transport in the active layer. Consequently, photovoltaic devices fabricated via a single-step film deposition reached a maximum AM1.5G power conversion efficiency of 11.3 % surpassing most previous reports of PbS solar cells employing perovskite passivation.

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