Mechanical signatures of degradation of the photovoltaic perovskite CH3NH3PbI3 upon water vapor exposure | Zendy

Massimo Spina | Zendy; A. Karimi | Zendy; Wanda Andreoni | Zendy; Carlo A. Pignedoli | Zendy; Bálint Náfrádi | Zendy; L. Forró | Zendy; Endre Horváth | Zendy

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Mechanical signatures of degradation of the photovoltaic perovskite CH3NH3PbI3 upon water vapor exposure

Author(s) -

Massimo Spina,

A. Karimi,

Wanda Andreoni,

Carlo A. Pignedoli,

Bálint Náfrádi,

L. Forró,

Endre Horváth

Publication year - 2017

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4978687

Subject(s) - nanoindentation , perovskite (structure) , materials science , degradation (telecommunications) , photovoltaic system , water vapor , iodide , chemical engineering , composite material , inorganic chemistry , chemistry , crystallography , electronic engineering , organic chemistry , ecology , engineering , biology

We report on the mechanical properties of CH3NH3PbI3 photovoltaic perovskite measured by nanoindentation. The Young's modulus (E) of the pristine sample is 20.0 ± 1.5 GPa, while the hardness (H) is 1.0 ± 0.1 GPa. Upon extended exposure to water vapor, both quantities decrease dramatically and the sample changes color from silver-black to yellow. Calculations based on density functional theory support this trend in the mechanical response. Chemical treatment of the degraded crystal in methylammonium iodide solution recovers the color of the pristine sample and the values of E and H within 50%.

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