Perovskite solar cells (PSCs) have become a hot topic in recent years due to their low fabrication costs and rising efficiencies. However, the stability degradation and the reduced efficiency caused by defect states in metal halide perovskites are the main constraint to the development of PSCs. At present, we have successfully designed and synthesized a range of organic materials with excellent passivation effect, elevated carrier mobility, and appropriate energy levels as interface modifications in PSCs, effectively improving their performance and stability. For instance, D-A-D type organic molecules were designed to enhance the hole extraction at PTAA/perovskite interface to enhance the performance of PTAA-based inverted PSCs. BDADBr was utilized as surface passivators at the buried surface of perovskite, which enlarged the grain size and boosted the device with enhanced efficiency and stability. Spiro compounds were synthesized to block ion migration between Spiro-OMeTAD and perovskite layer, resulting in dramatic enhancement in long-term stability and photostability of n-i-p PSCs. We believe the rational design of organic molecules to modify the interfaces of PSCs is an effective method to fabricate high-performance PSCs.

Dr. Yang Li received his bachelor's degree in Chemistry from Lanzhou University in 2011. In 2017, he received his master’s degree in Nanophysics from Gachon University, South Korea, under the tutorship of Prof. Eun-Cheol Lee. From 2017 to 2018, he worked as a research assistant under the supervision of Prof. Sam Hsu at City University of Hong Kong and Prof. Zhubing He at Southern University of Science and Technology. In 2022, he received his PhD degree from Institute of Applied Physics and Materials Engineering, University of Macau under the tutelage of Professors Xing Guichuan. During his PhD, his research mainly focused on improving the performance of PTAA-based inverted perovskite solar cells (PSCs) through interfacial engineering. He has attended more than 20 academic conferences and been invited as speakers for 8 times on PSCs at home and abroad and been appointed as the Young Editorial Board Member of eScience. Recently, he has been employed by Shihezi University as an associate professor. His current research interests focus on the exploration of the physical mechanism of PSCs and the preparation of efficient large-area flexible PSCs. He has published more than 10 SCI papers as the first or the corresponding author in peer reviewed journals, such as such as Small, Small Methods, Journal of Materials Chemistry A, ACS Applied Materials & Interfaces, Solar RRL, Photonics Research and so on.