Invited Talk: Rational Design for Efficient and Stable Halide Perovskite Solar Cells

The haldie perovskite solar cells (HPSCs) have shown impressive progress in power conversion efficiency (PCE) in the last several years. This progress is attributed to developments of device architecture, perovskite halides, and fabrication process based on materials and devices engineering. However, there still remain many challenging issues on the HPSCs to be commercialized in the various applications in terms of PCE and long-term stability. For example, a breakthrough in materials and devices engineering is required for further improvement of PCE and long-term stability as well as the development of the scalable process. Among them, we have focused on the management of charge collection including a reduction of open circuit voltage deficit that is a difference between band-gap of the light absorbing halide and open-circuit voltage of the completed device as well as an increase in fill factor. The voltage deficit and fill factor are the result of a complex combination of factors including trap concentration, interfacial imperfection, energy band position arrangement, intrinsic electrical conduction, and even morphology of layers in perovskite solar cells. In this talk, our approaches will be introduced to improve charge collection properties and long-term stability in HPSCs in terms of n-type, p-type and light absorbing halide materials engineering.