Recent Progress in Understanding the Structural, Optoelectronic, and Photophysical Properties of Lead Based Dion–Jacobson Perovskites as Well as Their Application in Solar Cells

Dion–Jacobson perovskites (DJPs) have been grabbing surging interest for solar cell (SC) applications due to their superior structural diversity and stability over their 3D based counterparts. Within 3 years of their birth, the DJPSCs have achieved a high power conversion efficiency (PCE) exceeding 18%. Parallel with the advancement in the device performance, the research community also gained a deep understanding of the fundamental properties of DJP materials that influence the performance of the corresponding SCs. This review summarizes the recent progress in understanding the fundamental structural, optoelectronic, and photophysical properties of the DJP materials and strategies used for improving the performance of the corresponding SCs from the molecule design and processing engineering points of view. Moreover, this work discusses the challenges encountered by DJPSCs and the potential research directions and strategies for further improving their performance, with the aim to inspire the future research to push the DJPSCs forward for practical applications.