Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Herein we analyze the dependence of the photophysical properties of nanostructured perovskite films with time and as a function of their microstructure. We find a clear correlation between the specific time evolution of the photoemission observed and well-defined microstructural features. This might allow to identify and minimize the cause of such instability, which might have major implications in the development of perovskite based light emitting devices.[1] At the same time, we employ the high sensitivity of the photoemission with the film structure to provide an unprecedented in-situ analysis of the process of thin film formation, in which we can clearly discriminate the time scale of the nucleation and growth regimes. Detailed information on the evolution of the film structure is attained by combining optical and X-ray in-situ analysis.[2] All these effects are in turn dependent on the environment. We have identified two different reversible processes in the form of photoinduced activation and darkening of the photoluminescence, extremely dependent on the atmosphere where the films are placed. [3] We resolve the role of oxygen and moisture in the photoactivation and photodarkening, respectively. Indeed, oxygen is revealed as decisive for the emission recovery after a fatigue of the PL in perovskite films. Our results thus tackle aspects of the physical properties of CH3NH3PbI3 which strongly determine their performance. The extracted conclusions provide insights which allow bringing this material closer to technological applications.
[1] M. Anaya, M.E. Calvo, Y. Li, J.F. Galisteo-López, H. Míguez, manuscript in preparation.
[2] M. Anaya, J.F. Galisteo-López, H. Míguez, "Photophysical analysis of the formation of organic-inorganic trihalide perovskite films: identification and characterization of crystal nucleation and growth", J. Phys. Chem. C 2016, DOI: 10.1021/acs.jpcc.6b00398.
[3] J.F. Galisteo-López, M. Anaya, M.E. Calvo, H. Míguez, J. Phys. Chem. Lett. 2015, 6, 2200-2205.
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