Dear Colleagues,

Organic and inorganic hybrid perovskites have emerged as a highly promising class of optoelectronic semiconductors, offering advantages such as facile processing, tunable bandgaps, and superior charge-transfer properties. These materials have shown great potential for various applications, including perovskite solar cells (PSCs), perovskite light-emitting diodes (PLEDs), perovskite photodetectors (PPDs), and perovskite lasers. The field of perovskite optoelectronics is inherently interdisciplinary, encompassing chemistry, physics, and materials science. Recent advancements in material synthesis and device fabrication have significantly propelled the development of perovskite optoelectronic applications. Notably, PSCs have experienced remarkable progress in recent years, with the power conversion efficiency (PCE) increasing from 3.8% in 2009 to 26% for single-junction laboratory-scale devices, rivaling commercial silicon-based solar cells. A crucial factor contributing to this success is the development of various solution-based synthesis and film-deposition techniques, enabling precise control over the morphology and composition of hybrid perovskite films. However, several scientific challenges still need to be addressed in the field of perovskite optoelectronic devices. These include the stability of perovskite precursor solutions and thin films, the regulation of thin-film crystallization kinetic processes, and understanding the mechanisms governing perovskite phase transitions. Currently, there is a pressing need for further research and investment in perovskite films to enhance their performance. Additionally, addressing the open questions and emerging topics mentioned above remains crucial and timely.

The present Special Issue on the "Progress and Prospects of Perovskite Films" may provide a comprehensive and scholarly examination of the field of perovskite optoelectronics. This Special Issue seeks to deepen our understanding and accelerate the development of perovskite optoelectronic devices.

Dr. Zhenhuang Su
Dr. Lingfeng Chao
Guest Editors

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• perovskite solar cells
• perovskite films
• perovskite light-emitting diode
• perovskite photodetectors
• perovskite lasers
• synchrotron scattering
• interface electronic structure
• GIWAXS
• XRD
• crystallization kinetics
• optical properties
• transport properties