Environmental effectson the photophysics of CH3NH3PbI3

Mauricio E. Calvo^a, Miguel Anaya^a, Juan F. Galisteo-López^a, Hernán Míguez^a

^aInstituto de Ciencia de Materiales de Sevilla (ICMS), Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, C/ Américo Vespucio 49, Sevilla, Spain

NIPHO
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV16)

Barcelona, Spain, 2016 March 3rd - 4th

Organizers: Emilio Palomares and Nam-Gyu Park

Oral, Juan F. Galisteo-López, presentation 037
Publication date: 14th December 2015

Third generation photovoltaics have witnessed the irruption of hybrid organic-inorganic perovskites as an unrivalled light harvester.[1] The rapidly achieved breakthroughs, comprising devices with high power conversion efficiencies, are beginning to be accompanied by fundamental studies necessary for turning the current rush into a mature technology. Research efforts aiming at a better understanding of the electrical, structural and photophysical properties of thismaterialare of utmost importance,as they will bridge the gap between the as-prepared material and realistic marketable devices with excellent performances. In this work we present an in-depth analysis regarding the photophysical properties of the methylammonium lead tri-iodide perovskite (CH3NH3PbI3) as a tool for understanding its performance under different environmental conditions. Beyond its use as a tool to study several aspects of CH3NH3PbI3, such as carrier recombination kinetics [2] or the crystallization of the material [3],photophysics have proved fundamental in understanding how the material interacts with its environment under device operation conditions. 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.[4] 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 PLin perovskite films. Our resultsthus tackle aspects of the physical properties of CH3NH3PbI3which strongly determine their performance. The extracted conclusions provide insights which allow bringingthis material closer to technological applications.

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