Journal
ADVANCED MATERIALS
Volume 30, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800973
Keywords
chemical doping; iodine diffusion; moisture stability; perovskite solar cells
Categories
Funding
- National Science Foundation [CBET 1150617, DMR 1806152]
- NIU Great Journeys Assistantship
- U.S. Department of Energy [DE-AC36-08GO28308]
- National Center for Photovoltaics - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, and Solar Energy Technologies Office
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1150617] Funding Source: National Science Foundation
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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 degrees 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:MAPbI(3)-based cell. As a bonus, the incorporated Se2- also effectively suppresses iodine diffusion, leading to enhanced chemical stability of the silver electrodes.
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