Using Low Temperature Photoluminescence Spectroscopy to Investigate CH3NH3PbI 3 Hybrid Perovskite Degradation

Khaoula Jemli (1, 2) , Hiba Diab (1) , Ferdinand Lédée (1, 2) , Gaëlle Trippé-Allard (1) , Damien Garrot (3) , Bernard Geffroy (4, 5) , Jean‐sébastien Lauret (1) , Emmanuelle Deleporte (1) , Pierre Audebert (2)

1 LAC - Laboratoire Aimé Cotton
2 PPSM - Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires
3 GEMAC - Groupe d'Etude de la Matière Condensée
4 LPICM - Laboratoire de physique des interfaces et des couches minces [Palaiseau]
5 LICSEN UMR 3685 - Laboratoire Innovation en Chimie des Surfaces et NanoSciences

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 [1] and to fundamental studies of the photophysics of the excitons. In particular, it is known that, under ambient conditions, CH3NH3PbI3 degrades producing some PbI2 [2]. We show here that low temperature photoluminescence (PL) spectroscopy is a powerful tool to detect PbI2 traces in hybrid perovskite layers and single crystals [3]. 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.

Mots clés: hybrid perovskites; degradation

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Khaoula Jemli, Hiba Diab, Ferdinand Lédée, Gaëlle Trippé-Allard, Damien Garrot, et al.. Using Low Temperature Photoluminescence Spectroscopy to Investigate CH3NH3PbI 3 Hybrid Perovskite Degradation. 14th International Conference on Frontiers of Polymers and Advanced Materials (ICFPAM 2016), Oct 2016, Daejon, South Korea. ⟨hal-01420937⟩