Divalent Anionic Doping in Perovskite Solar Cells for Enhanced Chemical Stability

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...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2018-07, Vol.30 (34), p.e1800973-n/a
Main Authors: Gong, Jue, Yang, Mengjin, Rebollar, Dominic, Rucinski, Jordan, Liveris, Zachary, Zhu, Kai, Xu, Tao
Format: Article
Language:English
Subjects:
chemical doping
Corrosion resistance
Doping
Iodine
iodine diffusion
Lead selenides
MATERIALS SCIENCE
moisture stability
Organic chemistry
perovskite solar cells
Perovskite structure
Perovskites
Photovoltaic cells
Solar cells
SOLAR ENERGY
Stability
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Summary: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. The chemical stabilities of CH3NH3PbI3 thin films and solar cells are greatly improved when PbSe dopant is added in the precursor solutions, where Se2− forms strong electrostatic interactions with CH3NH3 + and results in >140‐fold enhancement of film moisture stability, >70% retention of photovoltaic performance after 700 h of air aging, and suppressed iodine diffusion in solar‐cell devices.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201800973