Using Low Temperature Photoluminescence Spectroscopy to Investigate CH3NH3PbI3 Hybrid Perovskite Degradation
Khaoula Jemli,
Hiba Diab,
Ferdinand Lédée,
Gaelle Trippé-Allard,
Damien Garrot,
Bernard Geffroy,
Jean-Sébastien Lauret,
Pierre Audebert,
Emmanuelle Deleporte
Affiliations
Khaoula Jemli
Laboratoire Aimé Cotton, Ecole Normale Supérieure de Cachan, CNRS, Université Paris-Sud, Université Paris-Saclay, Bât 505 Campus d’Orsay, 91405 Orsay, France
Hiba Diab
Laboratoire Aimé Cotton, Ecole Normale Supérieure de Cachan, CNRS, Université Paris-Sud, Université Paris-Saclay, Bât 505 Campus d’Orsay, 91405 Orsay, France
Ferdinand Lédée
Laboratoire Aimé Cotton, Ecole Normale Supérieure de Cachan, CNRS, Université Paris-Sud, Université Paris-Saclay, Bât 505 Campus d’Orsay, 91405 Orsay, France
Gaelle Trippé-Allard
Laboratoire Aimé Cotton, Ecole Normale Supérieure de Cachan, CNRS, Université Paris-Sud, Université Paris-Saclay, Bât 505 Campus d’Orsay, 91405 Orsay, France
Damien Garrot
Groupe d’Etudes de la Matière Condensée (GEMaC), CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
Bernard Geffroy
Laboratory of Innovation in Surface Chemistry and Nanosciences, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
Jean-Sébastien Lauret
Laboratoire Aimé Cotton, Ecole Normale Supérieure de Cachan, CNRS, Université Paris-Sud, Université Paris-Saclay, Bât 505 Campus d’Orsay, 91405 Orsay, France
Pierre Audebert
Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires de l’Ecole Normale Supérieure de Cachan, 61 Avenue du Président Wilson, 94235 Cachan, France
Emmanuelle Deleporte
Laboratoire Aimé Cotton, Ecole Normale Supérieure de Cachan, CNRS, Université Paris-Sud, Université Paris-Saclay, Bât 505 Campus d’Orsay, 91405 Orsay, France
Investigating the stability and evaluating the quality of the CH3NH3PbI3 perovskite structures is quite critical both to the design and fabrication of high-performance perovskite devices and to fundamental studies of the photophysics of the excitons. In particular, it is known that, under ambient conditions, CH3NH3PbI3 degrades producing some PbI2. We show here that low temperature Photoluminescence (PL) spectroscopy is a powerful tool to detect PbI2 traces in hybrid perovskite layers and single crystals. Because PL spectroscopy is a signal detection method on a black background, small PbI2 traces can be detected, when other methods currently used at room temperature fail. Our study highlights the extremely high stability of the single crystals compared to the thin layers and defects and grain boundaries are thought to play an important role in the degradation mechanism.
