Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 22, Pages 7835-7841Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b03883
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Funding
- Heidelberg Graduate School of Fundamental Physics
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While the susceptibility of CH3NH3PbI3 to water is well-documented, the influence of water on device performance is not well-understood. Herein, we use infrared spectroscopy to show that water infiltration into CH3NH3PbI3 occurs much faster and at a humidity much lower than previously thought. We propose a molecular model in which water molecules have a strong effect on the hydrogen bonding between the methylammonium cations and the Pb-I cage. Furthermore, the exposure of CH3NH3PbI3 to the ambient environment increases the photo current of films in lateral devices by more than 1 order of magnitude. The observed slow component in the photocurrent buildup indicates that the effect is associated with enhanced proton conduction when light is combined with water and oxygen exposure.
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