Light Soak Study of Perovskite-Based Materials via Scanning Imaging Spectroscopy

摘要

Organic-inorganic halide perovskite has emerged as promising candidate materials for next-generation energy harvestingand light-emitting applications with the advantages of low processing cost, high defects tolerance, and excellent powerconversion efficiency. The instability of these perovskite-based materials under illumination, however, remains a majortechnical barrier for commercialization. Various techniques have been applied to improve the photo-stability ofperovskites. Since the dynamic of photo-generated charged carriers and photo-activated mobile ions affect the stableperformance of these applications, a comprehensive understanding of how illumination affect perovskites are of vitalimportance to improve the performance of perovskite-based optoelectronic applications. In this report, the recentprogress of the light soak study on three kinds of perovskites is presented, using depth-resolved, temporal-resolved, anddetection-wavelength selective spectroscopic imaging techniques. These works clarify different dominate roles indifferent perovskite structures and demonstrate the advantages of the imaging spectroscopy in studying the carrierdynamics of perovskite-based materials under light soaking, which is of crucial importance for their applications.