Defect Pair Formation in FAPbI3 Perovskite Solar Cell Absorbers

Formamidinium lead iodide (FAPbI(3)) based hybrid perovskite light absorbers have shown remarkable performance in recent years. Since they have unique set of optoelectronic characteristics, they are considered as a good candidate absorber material for future solar cell applications. Until recently, much research had focused on the quantitative analysis of point defects on halide-based perovskite solar cells. Studies show that understanding defect mechanisms in perovskites has a huge impact on efficiency and stability improvements; however, such mechanisms have not been fully understood yet. Here, using first-principles calculations, we investigate the possible defect pair formations in FAPbI(3), characterized by their formation energies and charge transitions. We found that while some donor and acceptor point defects are unstable and shallow when they are isolated, they form stable and deep-trap defect pairs and potentially limit the optoelectronic performance. We anticipate that our results will influence future discussions on the impact of defect formation on the performance and stability of perovskite solar cells.

Automated summary

Formamidinium lead iodide (FAPbI(3)) based hybrid perovskite light absorbers have unique optoelectronic characteristics, making them a promising candidate material for future solar cell applications. However, the defect mechanisms in perovskites are not fully understood yet. Using first-principles calculations, we found that some point defects in FAPbI(3) are unstable and shallow when isolated, but they form stable and deep-trap defect pairs, potentially limiting the optoelectronic performance.