EXTENDED ABSTRACT: Recently, metal halide perovskite semiconductors have attracted great attention for constructing efffcient solar cells, light-emitting diodes and detectors because of their excellent photoelectric properties. We are focusing on the study of low-dimension perovskites and their optoelectronic devices. We constructed multi-molecular coordination system to control crystal orientation growth technology to achieve low-dimensional semiconductor epitaxial and monocrystalline films, and develop novel ligand to control perovskite interfaces for preparing efficient and stable optoelectronic devices. For example, a multi-molecular ligand crystal orientation growth technology had been developed to fabricate monolayer perovskite fflms, thus achieving efffcient optoelectronic devices [1-2]. Then, 1-50 nm bismuth oxide epitaxial fflms can be obtained by sol-gel process with ligand coordination, thus achieving high ferroelectric performance at atomic scale [3]. Subsequently, strongly conffned perovskite nancrystals, such as 0-dimensional quantum dots and 2-dimensional quantum wells with size dispersion of 9% and high color purity were achieved by colloidal synthesis with ligand coordination. The efffciency of the light-emitting diodes based the nanocrystals were more than 25% [4-6]. Finally, the design and development of novel perovskite and perovskite derivatives with free heven metals by machine learning are prospected to solve the heavy metal toxicity issue.
Keywords: Perovskite; ligands coordination; optoelectronics; machine learning
REFERENCES:
[1] C. H. Bi, Z. W. Yao, X. J. Sun, et al. Adv. Mater., 33(15), (2021) 2006722.
[2] B. Li, Y. Liu, W. Pu, et al. Adv. Funct. Mater. 34(29), (2024) 2400467.
[3] Q. Q. Yang, J. C. Hu, W. Y. Fang, et al. Science 379 (6638), (2023) 1218-1224.
[4] M. Q. Zhang, C. H. Bi, Y. X. Xia, et al. Angew. Chem. Int. Ed. 62(12), (2023) e202300149.
[5] J. Guo, M. Y. Xie, H. R. Li, et al. Nano Lett. 24(21), (2024) 6410-6416.
[6] A. Q. Liu, C. H. Bi, J. Li, et al. Nano Lett., 23 (6), (2023) 2405-2411.
Professor Jianjun Tian, graduated from the University of Science and Technology Beijing (USTB), worked as a postdoctoral fellow at the University of Washington (Seattle), and is now the vice-Dean, professor in USTB. He has been focusing on the low-dimensional semiconductors-based optoelectronics, and has published more than 200 peer-reviewed papers in academic journals such as Science, Advanced Materials and Nano Letter.