Special issue on Advances in Solar Energy: Perovskite solar cells

We are pleased to present this special issue on Advances in Solar Energy: Special Issue on Perovskite Solar Cells, which covers invited reviews and research articles on the perovskite materials and devices. Prof. Miyasaki first invented perovskite solar cells with a device efficiency of 3.8 %, and swiftly crossed to over 26 % in a single junction device. In silicon/perovskite tandem, solar cells the efficiency reached over 34 %. The device efficiency reached by 40 % under low-light/ artificial indoor light conditions. All these advancements have been accomplished due to the compositional and interfacial engineering and new device fabrication methods. Researchers from academic institutes and industries have focused on developing alternative low-cost, efficient materials and adopting new fabrication methods to address the lead toxicity issue of the technology. It is well known in the literature that lead-free perovskites, particularly all inorganic perovskites, have descent device efficiencies with better durability, which is a challenging task for commercialization. The other components of the device are either expensive gold-based counter electrodes or unstable holetransporting material, Spiro-OMeTAD. For the last half-decade, researchers have intensified searching for alternative hole-transporting materials and counter-electrode materials. Understanding the device's degradation aspects is also essential so one can efficiently design the new materials. Understanding the photophysics of the device, i.e., its absorption, emission, hole, and electron transfer phenomena, is also very essential. The main objective of the special issue is to provide a comprehensive view of the latest developments in perovskite solar cells and to disseminate the current stateof-the-art research in the field. To this end, the special issue features about peer-reviewed articles that address the latest developments in perovskite solar cells, which include materials, fabrication, and commercialization aspects in the form of research and review articles as follows: Six review articles cover the indoor applications of perovskite solar cells, highlighting the challenges and commercialization aspects. The review articles also cover the latest developments on hole transporting materials and their integration into powered electrochemical cells: ☆ This article is part of a special issue, Perovskite Solar Cells, published in Solar Energy.