Using Low Temperature Photoluminescence Spectroscopy to Investigate CH$_3$NH$_3$PbI$_3$ Hybrid Perovskite Degradation

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

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 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences

Investigating the stability and evaluating the quality of the CH$_3$NH$_3$PbI$_3$ 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, CH$_3$NH$_3$PbI$_3$ degrades producing some PbI$_2$. We show here that low temperature Photoluminescence (PL) spectroscopy is a powerful tool to detect PbI$_2$ traces in hybrid perovskite layers and single crystals. Because PL spectroscopy is a signal detection method on a black background, small PbI$_2$ 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.

Keywords: photoluminescence; optoelectronics; solar cells; hybrid perovskite; CH$_3$ NH$_3$ PbI$_3$; degradation

Domains: Chemical Sciences; Material chemistry

Khaoula Jemli, Hiba Diab, Ferdinand Lédée, Gaelle Trippé-Allard, Damien Garrot, et al.. Using Low Temperature Photoluminescence Spectroscopy to Investigate CH$_3$NH$_3$PbI$_3$ Hybrid Perovskite Degradation. Molecules, 2016, 21, pp.885. ⟨10.3390/molecules21070885⟩. ⟨cea-01634478⟩