Reversible Hydration of CH 3 NH 3 PbI 3  in Films, Single Crystals, and Solar Cells

Leguy, Aurélien M. A.; Hu, Yinghong; Campoy‐Quiles, Mariano; Alonso, M. I.; Weber, Oliver J.; Azarhoosh, Pooya; Schilfgaarde, Mark van; Weller, Mark T.; Bein, Thomas; Nelson, Jenny; Docampo, Pablo; Barnes, Piers R. F.

doi:10.1021/acs.chemmater.5b00660

articleChemistry of MaterialsApr 5, 2015GREEN OA

Reversible Hydration of CH 3 NH 3 PbI 3 in Films, Single Crystals, and Solar Cells

AMAurélien M. A. Leguy YHYinghong Hu MCMariano Campoy‐Quiles MIM. I. Alonso OJOliver J. Weber

Imperial College London · Ludwig-Maximilians-Universität München · +3 more institutions

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Abstract

Solar cells composed of methylammonium lead iodide perovskite (MAPI) are notorious for their sensitivity to moisture. We show that (i) hydrated crystal phases are formed when MAPI is exposed to water vapor at room temperature and (ii) these phase changes are fully reversed when the material is subsequently dried. The reversible formation of CH3NH3PbI3·H2O followed by (CH3NH3)4PbI6·2H2O (upon long exposure times) was observed using time-resolved XRD and ellipsometry of thin films prepared using “solvent engineering”, single crystals, and state-of-the-art solar cells. In contrast to water vapor, the presence of liquid water results in the irreversible decomposition of MAPI to form PbI2. MAPI changes from dark…

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Topics & keywords

Topics

Keywords

Photocurrent
Perovskite (structure)
Materials science
Ellipsometry
Iodide
Solar cell
Analytical Chemistry (journal)
Hysteresis

UN Sustainable Development Goals

Clean water and sanitation

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