Abstract:
Perovskite solar cells promise to yield efficiencies beyond 30% by further improving the quality of the materials and devices. Electronic defect passivation and suppression of detrimental charge-carrier recombination at the different device interfaces has been used as a strategy to achieve high performance perovskite solar cells. However, the mechanisms that allow for carriers to be transferred across these interfaces are still unknown. Through the contributions to better understand 2D and 3D defects the perovskite solar cell field has been able to improve device performance. Albeit the rapid improvements in performance, there is still a need to understand how these defects affect long term structural stability and thus optoelectronic performance over the long term. In this presentation, I will discuss the role of crystal surface structural defects on optoelectronic properties of lead halide perovskites through synchrotron-based techniques. The importance of interfaces and their contribution to detrimental recombination will also be discussed. Finally, a discussion on the current state-of-the-art of performance and stability will be presented.

Bio:
Juan-Pablo Correa-Baena is an Assistant Professor and the Goizueta Junior Faculty Chair in the School of Materials Science and Engineering at Georgia Tech. His group focuses on understanding the relationship between chemistry, crystallographic structure, and properties of emerging semiconducting materials. Dr. Correa-Baena is developing deposition techniques, such as atomic layer deposition and thermal evaporation, for hybrid organic-inorganic materials with atomic and nanoscale control. His group is also developing advanced characterization methods, including synchrotron-based x-ray scattering and fluorescence, to answer fundamental questions about metastable hybrid materials. His research program has attracted funding from the Department of Energy, the Department of Defense, the NSF, industry partners, and foundations, among others. His work has been cited over 32,000 times (h-index of 62) making him a top cited researcher as recognized by the Web of Science Group Highly Cited Researchers since 2019 and Nature Index Leading early career researcher in materials science (2019).