Project Description

Semiconductor quantum wells and superlattices are the foundation of many electronic and optoelectronic devices including light-emitting diodes (LED), lasers, infrared photodetectors, and thermoelectric devices. Two-dimensional (2D) layered halide perovskites have attracted considerable attention as an alternative to III-V compounds for achieving quantum well structures due to their solution-processability, their wide structure and property tunability, and excellent optoelectronic properties. These quantum well structures are ideal for applications in high efficiency solid-state light emitting diodes and lasers. However, the practical applications of the 2D perovskites in LED and laser devices are limited by poor charge injection due to the large barrier height of the organic ligands and the poor stability due to facile ion migration under electrical bias.

In this joint project, we aim to 1) synthesize new types of 2D organic-inorganic halide perovskite featuring the use of conjugated organic semiconductor ligands towards better charge injection and stability; 2) investigated the charge carrier dynamics and recombination mechanisms using state-of-the-art ultrafast spectroscopy methods; 3) demonstrate proof-of-concept highly efficient LED devices. Our research interests are broad. In addition to this direction, the candidates may propose any other aspects within this broad topic.

Start Date

August 2020 

Postdoc Qualifications 

PhD in related fields; Experiences in both materials chemistry and photo-physics of semiconductor materials. 

Co-advisors

Letian Dou
dou10@purdue.edu
Davidson School of Chemical Engineering

Libai Huang
libai-huang@purdue.edu
Department of Chemistry 

References

Yao Gao, Enzheng Shi, Shibin Deng, Stephen B. Shiring, Jordan M. Snaider, Brett M. Savoie, Libai Huang, Letian Dou; “Molecular Engineering of Organic-Inorganic Hybrid Perovskites Quantum Wells”, Nature Chemistry 2019, in press.

Enzheng Shi, Shibin Deng, Biao Yuan, Yao Gao, Akriti, Long Yuan, Chelsea S. Davis, Dmitry Zemlyanov, Yi Yu, Libai Huang, Letian Dou; “Extrinsic and Dynamic Edge States of Two-Dimensional Lead Halide Perovskites”, ACS Nano 2019, 13, 1635-1644

Letian Dou, Andrew B. Wong, Yi Yu, Minliang Lai, Nikolay Kornienko, Samuel W. Eaton, Anthony Fu, Connor G. Bischak, Jie Ma, Tina Ding, Naomi S. Ginsberg, Lin-Wang Wang, A. Paul Alivisatos, Peidong Yang; “Atomically Thin Two-dimensional Organic-inorganic Hybrid Perovskites”, Science 2015, 349, 1518-1521.

Zhi Guo, Yan Wan, Mengjin Yang, Jordan Snaider, Kai Zhu, Libai Huang*; “Long-range hot-carrier transport in hybrid perovskites visualized by ultrafast microscopy”, Science, 2017, 356, 59-62.

Jordan M. Snaider, Zhi Guo, Ti Wang, Mengjin Yang, Long Yuan, Kai Zhu, and Libai Huang*; “Ultrafast Imaging of Carrier Transport across Grain Boundaries in Hybrid Perovskite Thin Films”, ACS Energy Letters 2018, 3, 1402-1408.