Author: LetianDou

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.

Shuchen’s paper about Moiré superlattices in twisted two-dimensional halide perovskites has been published in Nature Materials. Another exciting collaboration with Huang group. Congratulations!

We introduce perovskite moiré superlattices leveraging ultrathin, ligand-free halide perovskites, facilitated by ionic interactions. Twist-angle-dependent transient photoluminescence microscopy and electrical characterizations indicate the emergence of localized bright excitons and trapped charge carriers near a twist angle of ~10°. The localized excitons are accompanied by enhanced exciton emission, attributed to an increased oscillator strength by a theoretically predicted flat band. Read the story here.

The group warmly welcomes a new postdoc fellow Dr. Tareq Hossain joining us. Tareq received his PhD in Chemistry from University of Kentucky with Prof. Ken Graham. Tareq will work on perovskite solar cell and novel perovskite absorbers for hydrogen generation. Welcome to the group. Look forward to working together!

Wenhao and Jeong Hui’s paper on the molecular templating of layered halide perovskite nanowires have been published in Science. Congratulations!

Dr. Phil Szuromi’s summary: “A templating method enables the growth of two-dimensional metal-halide perovskite nanowires that exhibit polarized photoluminescence and enable low-loss waveguiding. Shao et al. grew nanowires of (BrCA3)₂PbBr₄, where BrCA3 is 2-(2-bromo-5-carboxyphenoxy)ethan-1-aminium. The carboxylic acid group of BrCA3 inhibited the growth of all crystal facets except [110], which led to one-directional growth. The nanowires also achieved efficient light amplification, with a threshold of less than 20 microjoules per square centimeter.” Read the full story here. The story is highlighted by Purdue and many news outlets.

The group welcomes Chenyu Li from Georgia Tech to join the SURF program this summer. Chenyu will work on synthesis and characterization of 2D perovskite nanostructures and nanowires. Welcome to the group!

In addition, our existing group member Anika Bhoopalam is also selected for the SURF award and will be co-advised with Prof. Arun Mannodi Kanakkithodi and work on novel low band gap perovskite absorbers this summer. Congratulations!

Jee receives 2024 Carbon Future Young Researcher Honorable Mention Award from Carbon Future editorial office and Tsinghua University Press. Congratulations!

Jee Yung Park successfully defended his thesis! — Sixth PhD in our group. Big congratulations! Jee is heading to Yale to do a postdoc training with Prof. Peijun Guo. Thank you for your hard work over the years. Best of luck in your future endeavors!

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!