School of Materials Science and Engineering, Georgia Institute of Technology
Juan-Pablo Correa-Baena is an Assistant Professor and the Goizueta Junior Faculty Rotating Chair in the School of Materials Science and Engineering at the Georgia Institute of Technology in Atlanta, USA. His group focuses on understanding and control of electronic dynamics at the nanoscale of low-cost semiconductors, such as halide perovskites and other materials, for solar cell and light emitting diode applications. Juan-Pablo’s group works on advanced deposition techniques, with emphasis on low-cost equipment and high throughput, as well as advanced characterization methods that include synchrotron-based mapping and imaging approaches with nanoscale resolution. Juan-Pablo has published over 100 peer-reviewed papers in materials science for optoelectronic devices and some of the most impactful work in perovskite solar cell research, in the journals Nature, Science, Energy and Environmental Science, Advanced Materials, and Nature Energy, among others. Juan-Pablo received his PhD from the University of Connecticut, and trained as a postdoctoral fellow in the group of Prof. Michael Grätzel at the Ecole Polytechnique Fédérale de Lausann. He was awarded the Department of Energy EERE fellowship to conduct a second postdoctoral work at MIT. His work has been cited over 28,000 times (h-index of 59) making him a top cited researcher as recognized by the Web of Science Group, Highly Cited Researchers-cross-field (2019, 2021) and Chemistry (2020), and Nature Index, Leading early career researcher in materials science (2019).
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.