Divalent Anionic Doping in Perovskite Solar Cells for Enhanced Chemical Stability

Kai Zhu, Mengjin Yang, Jue Gong, Dominic Rebollar, Jordan Rucinski, Zachary Liveris, Tao Xu

Research output: Contribution to journalArticlepeer-review

50 Scopus Citations

Abstract

The chemical stabilities of hybrid perovskite materials demand further improvement toward long-term and large-scale photovoltaic applications. Herein, the enhanced chemical stability of CH3NH3PbI3 is reported by doping the divalent anion Se2− in the form of PbSe in precursor solutions to enhance the hydrogen-bonding-like interactions between the organic cations and the inorganic framework. As a result, in 100% humidity at 40 °C, the 10% w/w PbSe-doped CH3NH3PbI3 films exhibited >140-fold stability improvement over pristine CH3NH3PbI3 films. As the PbSe-doped CH3NH3PbI3 films maintained the perovskite structure, a top efficiency of 10.4% with 70% retention after 700 h aging in ambient air is achieved with an unencapsulated 10% w/w PbSe:MAPbI3-based cell. As a bonus, the incorporated Se2− also effectively suppresses iodine diffusion, leading to enhanced chemical stability of the silver electrodes.

Original languageAmerican English
Article number1800973
Number of pages6
JournalAdvanced Materials
Volume30
Issue number34
DOIs
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

NREL Publication Number

  • NREL/JA-5900-71096

Keywords

  • Chemical doping
  • Iodine diffusion
  • Moisture stability
  • Perovskite solar cells

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