Letian Dou Group

Jee and Yoonho’s paper on the bias-induced ion migration in 2D perovskite heterostructures have been published in Matter. Congratulations!

We fabricate a 2D perovskite single-crystal heterostructure device that can visualize real-time movement of halide anions under external electric bias. Directional movement as well as the favored channels of ion migration are investigated, while post-migration device characteristics are revealed to exhibit asymmetry due to directional ion migration. Read the full story here. A temporary sharable link here.

Dr. Yoonho Lee joins Sungshin Women’s University as an Assistant Professor.

Dr. Jiaonan Sun joins City University of Hong Kong as a postdoc (with Prof. Alex Jen) and will transit to South China University of Technology as an Assistant Professor in 2025.

Thank you both for the great work at Purdue and good luck with your future endeavors!

Jiaonan receives Davidson School of Chemical Engineering’s Special Employee Recognition Award.

Jee receives Davidson School of Chemical Engineering’s Graduate Student Recognition Award.

Congratulations!

Jeonghui passes her PhD qualifier exam. Congratulations!

Dr. Dou receives a prestigious Humboldt Research Fellowship (from the Alexander von Humboldt Foundation) and will spend several months visiting University of Cologne in Germany (hosted by Prof. Malte Gather). Congratulations!

Yu-Ting Yang, Zhixu Li, and Mona Hosseinzade join our group as first-year graduate students.

Mona receives her BS and MS in Isfahan University of Technology and Amirkabir University of Technology, respectively. She will be coadvised with Prof. Jianguo Mei and work on solar cells. Zhixu receives his BS and MS in Fuzhou University and Tianjian University, respectively. He will work on recyclable polymers and polymer crystallization. Yu-Ting receives her BS in Chemical Engineering from National Taiwan University. She will work on perovskite light emitters and LEDs.

Welcome to the group and look forward to working together!

Hanjun’s paper on Dimensionality Engineering of Lead Organic Chalcogenide Semiconductors has been published in JACS.  In this work, we synthesize a new family of 2D lead organic chalcogenide (LOC) materials with excellent structural and dimensionality tunability by designing the bonding ability of the organic molecules and the stereochemical activity of the Pb lone pair. The introduction of electron-donating substituents on the benzenethiol ligands results in a series of LOCs that transition from 1D to 2D, featuring reduced band gaps (down to 1.7 eV), broadband emission, and strong electron–phonon coupling. Read the article here.

Former postdoc Dr. Kang Wang joins Institute of Chemistry, Chinese Academy of Sciences as a professor.

Former postdoc Dr. Shuchen Zhang joins Department of Chemistry, University of Science and Technology of China (USTC) as a TT assistant professor.

Big congratulations! Good luck and look forward to seeing your independent work!

Jiaonan’s perspective article on the concept and recent development of OSiP has been published in JACS. Specifically, we summarize recent advances in the design, synthesis, and structural analysis of OSiPs with various organic conjugated moieties as well as the application of OSiPs in photovoltaics, light-emitting devices, and transistors. Read the article here.

Second JACS in a row! Congratulations!

Another beautiful work by Ajeet, entitled “Two-Dimensional Halide Pb-Perovskite–Double Perovskite Epitaxial Heterostructures” is published in JACS now, same day with Jee’s nature chemistry paper. What a day!

We report epitaxial core-shell heterostructures via growing Pb-free double perovskites (involving combinations of Ag(I)–Bi(III), Ag–Sb, Ag–In, Na–Bi, Na–Sb, and Na–In) around Pb perovskite 2D crystals. Interestingly, distinct from Pb–Pb and Pb–Sn perovskite heterostructures, growths of the Pb-free shell at 45° on the (100) surface of the lead perovskite core are observed in all Pb-free cases. Read the story here.