New publication

Aihui and Yao’s work entitled “Ligand-Driven Grain Engineering of High Mobility Two-Dimensional Perovskite Thin-Film Transistors” has been published in JACS. We demonstrate field-effect transistors of a novel 2D OSiP with hole mobility approaching 10 cm2 V–1 s–1 with ON/OFF current ratios of ∼106 and excellent stability and reproducibility. Great collaboration with Prof. M. Ashraf Alam group and many others. Congratulations! Read the story here.

New postdocs

The group warmly welcomes two new postdoc fellows Dr. Yoon Ho Lee and Dr. Jiaonan Sun joining us. Dr. Lee received his PhD in Chemical Engineering from POSTECH with Prof. Joon Hak Oh. He will be co-advised by Prof. Dou and Prof. Mei on perovskite solar cells. Dr. Jiaonan Sun received her PhD in Chemistry from Ohio State University with Prof. Yiying Wu. She will work on developing novel and stable OSiPs for solar cells and LEDs. Welcome to the group. Look forward to working together!

New grants

The group receives new funding supports from Department of Energy Office of Basic Energy Sciences (with Prof. Libai Huang group) working on exciton and spin transports in 2D perovskites and National Science Foundation Division of Electrical, Communications and Cyber Systems (with Prof. Hanwei Gao at Florida State Univ.) working on perovskite LEDs. Thanks DOE and NSF for the supports!

New publication

Ke’s paper entitled “Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells” has been published in Advanced Materials. Read the story here.

We report a novel multifunctional semiconducting organic ammonium cationic interface modifier inserted between the light-harvesting perovskite film and the hole-transporting layer. It is shown that the conjugated cations can directly extract holes from perovskite efficiently, and simultaneously reduce interface non-radiative recombination. Together with improved energy level alignment and the stabilized interface in the device, a triple-cation mixed-halide medium-bandgap solar cell with an excellent power conversion efficiency of 22.06% (improved from 19.94%) and suppressed ion migration and halide phase segregation, which lead to a long-term operational stability, is demonstrated.

New publication

Yao’s perspective entitled “Organic semiconductor-incorporated two-dimensional halide perovskites” has been published in National Science Review. Read the story here.

In this perspective article, we defined OSiP: Organic Semiconductor-incorporated Halide Perovskites; and discussed recent progress toward this exciting new direction concisely.

Visiting student

The group welcomes a visiting undergraduate student, Martin Gomez Dominguez, from Universidad de los Andes of Colombia. Martin will stay for the summer and work on halide perovskite solar cells. Welcome to Purdue!

SURF student

The group welcomes Joseph Farrell, a undergrad researcher from school of mechanical engineering of Purdue University joining us as a SURF recipient! Joe will work with on halide perovskite transistors and solar cells starting from the summer. Welcome to the group!