ABX3 Perovskites for Tandem Solar Cells

Perovskite solar cells carry the banner for emerging photovoltaics since they have demonstrated power conversion efficiency values well above 20%, which were traditionally only accessible for fairly established technologies such as silicon. Indeed, ABX(3) perovskite materials have revolutionized solar cells due to their ease of processing and outstanding electronic and optical properties, which make them ideal candidates for the development of multi-junction devices aiming to surpass limits associated to stand-alone technologies. In this review we discuss the latest regarding this matter. First, we introduce standard materials and processing techniques involved in the preparation of state-of-the-art perovskite solar cells. We then discuss the development of perovskite-based tandem devices in which ABX(3) perovskite acts as the active material in the top subcell and Si, CIGS, polymer, or ABX(3) act as bottom sub-cells. Finally, we provide the reader with a discussion on the different lines of research that this rapidly developing field may follow.