Water Infiltration in Methylammonium Lead Iodide Perovskite: Fast and InconspicuousMueller, C., Glaser, T., Plogmeyer, M., Sendner, M., Doering, S., Bakulin, A. A., Brzuska, C., Scheer, R., Pshenichnikov, M. S., Kowalsky, W., Pucci, A. & Lovrincic, R., 24-Nov-2015, In : Chemistry of Materials. 27, 22, p. 7835-7841 7 p.
Research output: Contribution to journal › Article › Academic › peer-review
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.
|Number of pages||7|
|Journal||Chemistry of Materials|
|Publication status||Published - 24-Nov-2015|
- ORGANOMETAL HALIDE PEROVSKITES, SOLAR-CELLS, CH3NH3PBI3 PEROVSKITE, SINGLE-CRYSTALS, DEGRADATION, HYSTERESIS, DYNAMICS, FILMS, POLARIZATION, PHOTOPHYSICS