Abstract

Metal halide perovskites possess exceptional optoelectronic properties, making them highly promising for high-efficiency solar cells and X-ray detection. Recent studies show that defects within perovskite films and at their interfaces can induce detrimental strain, impede carrier transport, and lower ion-migration barriers, ultimately compromising device performance and stability. This talk will present our recent progress from both device-design and interface-engineering perspectives in perovskite/CIGS tandem solar cells and perovskite-based X-ray detectors. Through these strategies, we have achieved a certified power conversion efficiency of 28.2% for two-terminal perovskite/CIGS tandems, with a T₈₀ operational stability exceeding 1000 hours. We also explore methods to enhance the stability of single-crystal perovskites and large-area wafers by suppressing dark current, aiming to realize long-term stable X-ray detector operation. Furthermore, we discuss approaches to improve the environmental robustness of perovskite X-ray detectors, particularly for deployment in space environments. 

[1] F. Pei, S. Lin, Z. Zhang, S. Lin, X. Huang, M. Zhao, Jian Xu1, X. Zhuang, Y. Zhang, J. Tang, Y. Chen, K. Li, L. Wang, G. Liu, D. Qian, H. Liu, W. Zhou, Y. Chen, J. Wang, H. Zhou, B. Li, D. Zhong, Y. Jiang*, Q. Chen*, Inhibiting defect passivation failure in perovskite for perovskite/Cu(In,Ga)Se2 monolithic tandem solar cells with certified efficiency 27.35%, Nat. Energy, 2025, 10, 824-835.

[2] T. Zhao, X. Jin, M-H. Li*, J. Li, S. Wang, Z. Zhang, P. Sun, S. Lin, Q. Chen, J-S. Hu*, Y. Li*, Y. Jiang*, π-conjugation induced in-situ nanoscale ordering of spiro-OMeTAD boosts the efficiency and stability of perovskite solar cells, J. Am. Chem. Soc., 2024, 146, 45, 30893–30900.

[3] Q. H. Chen, Y. Zhang, P. Huang, Q. Chen, Z. Yang*, and Y. Jiang*, Optical, Electrical, Thermal, Stress and Energy Yield Simulations Enhance the Performance and Stability of Perovskite Photovoltaics, Adv. Mater., 2025, doi.org/10.1002/adma.202514184.

[4] F. Pei†, S. Lin†, J. Tang†, X. Huang, Y. Han, Q. Sun, S. Lin, H. Wang, Z. Zhang, X. Zhuang, K. Li, C. Zhu, Y. Chen, T. Song, T. Cheng, Y Cui, Y. Zhang, W. Zhou, B. Li, S. Hong, H. Zhou, X. Wang, Y. Zhou, D. Zhong^,*, Q. Chen*, Y. Jiang*, Perovskite/CIGS Tandem Solar Cells with over 1000 h OperationalStability through Interconnection Stress Relief, J. Am. Chem. Soc., 2025, 147, 40, 36815.

[5] Z. Zhang, B. Zhang*, Yan Jiang* et al., Coordination engineering with crown ethers for perovskite precursor stabilization and defect passivation, Energy Environ. Sci., 2024, 17, 7182-7192. 

Biography

Dr. Yan Jiang, Professor, School of Materials Science & Engineering, Beijing Institute of Technology (BIT). He received his Ph.D. degree in Physical Chemistry at institute of Chemistry, Chinese Academy of Sciences (ICCAS) in 2015. Between 2015 and 2020, he worked at Okinawa Institute of Science and Technology Graduate University (OIST) and Swiss Federal Laboratories for Materials Science and Technology (Empa) as a postdoctoral scholar. He was head of Energy Materials and Optoelectronics Unit, Songshan Lake Materials Laboratory, China (2020-2022). His research focuses on next-generation high-performance energy harvesting materials and devices. He has published over 80 papers in Nat. Energy (4), Nat. Commun. (2), Energy & Environ. Sci. (4), Joule (2), Adv. Mater. (5), J. Am. Chem. Soc. (2) and received the total citation of 7500. He serves on the youth editorial boards of Energy Materials Advances (AAAS), Interdisciplinary Materials (Wiley), and Materials Futures (IOP).