Letian Dou Group

Derrick Villalba join our group as a first-year graduate student. Derrick receives his BS in Georgia Institute of Technology. He will work on characterization and device physics of OSiP. Welcome to the group and look forward to working together!

Wenhao received first prize in AIChE’s Materials Engineering and Science Division poster award competition. Congratulations!

Yu-Ting and Zhixu passed their qualifier exams and become PhD candidate now. Congratulations!

Undergrad student Anika is selected to receive Honors College Scholarly Project grant to support her BS thesis research. Congratulations!

The group warmly welcomes a new visiting postdoc fellow Dr. Jing Li and a
SERB-OVDF fellow Avija Ajayakumar joining us. Jing received his PhD from Dalian University of Technology with Prof. Yiming Yang; Avija is currently a PhD student at National Institute For Interdisciplinary Science and Technology (NIIST) with Dr. Vijayakumar Chakkooth. Both of them will spend a year with us. Welcome to the group. Look forward to working together!

Kang’s work on two-dimensional-lattice-confined single-molecule-like aggregates has been published in Nature. Congratulations!

We discovery an unprecedented phase of molecular aggregate that forms in a two-dimensional hybrid perovskite superlattice with a near-equilibrium distance, which we refer to as a single-molecule-like aggregate (SMA). By implementing two-dimensional superlattices, the organic emitters are held in proximity, but, surprisingly, remain electronically isolated, thereby resulting in a near-unity photoluminescence quantum yield, akin to that of single molecules! Moreover, the emitters within the perovskite superlattices demonstrate strong alignment and dense packing resembling aggregates, allowing for the observation of robust directional emission, substantially enhanced radiative recombination and efficient lasing. Read the story here.

This work is highlighted by Purdue, Notre Dame, etc.

Our undergrad student Anika and her work on perovskite solar cells, semiconductors, and simulations are being highlighted in the Purdue News — Celebrating 150 years of Purdue engineering excellence. Congratulations! Read the story here.

The group warmly welcomes a new visiting postdoc fellow Dr. Hyuntae Choi joining us. Hyuntae received his PhD in Chemical Engineering from POSTECH with Prof. Taiho Park and currently a postdoc at Chungnam National University with Prof. Seulki Song. He will work on perovskite solar cells and LEDs. Welcome to the group. Look forward to working together!

Yuanhao’s work on “Triplet Management at Ligand-Perovskite Interface to Enhanced Photovoltaics Performance” has been published in ACS Energy Letters. Congratulations!

We report the observation of charge transfer from FAPbI₃ to the triplet state of a pyrene (Pyr)-based cationic ligand. Interestingly, a subtle structural modification from Pyr to the triphenylene (TP) core gave rise to shallower triplets that prohibit triplet electron transfer. This strategy has led to an enhanced efficiency of 24.69% from 23.10%. The devices retained above 80% initial PCE after 4000 h of light soaking. Read the story here.

Chenjian’s perspective article discussing charge transfer in 2D halide perovskites and 2D/3D heterostructures has been published in ACS Energy Letters. Congratulations!

In this Perspective, we address common terminological inaccuracies in energy level descriptions, delineate methods for energy alignment characterization, and present practical instances of CT in 2D perovskite-incorporated solar cells. Read the story here.