Design Exciton and Spin Functionalities in Halide Perovskite Epitaxial Heterostructures

Interdisciplinary Areas: Micro-, Nano-, and Quantum Engineering

Project Description

Two-dimensional (2D) organic-inorganic halide perovskites have emerged as an exciting new class of optoelectronic materials, supporting strongly bound excitons with large oscillator strength. The large spin-orbit coupling endowed by the heavy elements such as Pb also leads to great potentials for future spintronic and spin-optoelectronic applications. These unique properties have inspired substantial research efforts in exploring exciton and spin properties in these materials in recent years. Their unique properties along with highly programmable structures make them great candidates for constructing heterostructures to control the dynamics and transport of both the charge and spin degrees of freedom. However, the current synthesis and characterization methods both lack the necessary precision for controlling the interfaces and interactions, hindering the realization of a "materials-by-design" approach for heterostructures based on 2D halide perovskites. To bridge this research gap, the overarching goal of the proposal is to develop well-controlled and atomically precise halide perovskite epitaxial heterostructures as a material platform for long-range exciton and spin transport. We will design lateral and vertical heterostructures to form interfacial excitons with long lifetimes and many-body interactions favorable for ultralong-range transport. Furthermore, lattice symmetry and interfacial strain will be tuned synthetically to suppress spin relaxation and to enhance spin transport.

Start Date

2/22/2021

Postdoc Qualifications

PhD in chemistry, physics, materials science, chemical engineering or related fields. Hand-on experience with nanomaterials synthesis and characterization and ultrafast spectroscopy.

Co-Advisors

Letian Dou (Chemical Engineering) Email: dou10@purdue.edu
Libai Huang (Chemistry) Email: libai-huang@purdue.edu
 
Bibliography
 
Aihui Liang, Kang Wang, Yao Gao, Blake P. Finkenauer, Chenhui Zhu, Linrui Jin, Libai Huang, Letian Dou*; "Highly Efficient Halide Perovskite Light-Emitting Diodes via Molecular Passivation", Angewandte Chemie International Edition 2021, 60, 8337-8343.
 
Kang Wang, Linrui Jin, Yao Gao, Aihui Liang, Blake P. Finkenauer, Wenchao Zhao, Zitang Wei, Chenhui Zhu, Tzung-Fang Guo, Libai Huang, Letian Dou*; "Lead-Free Organic-Perovskite Hybrid Quantum Wells for Highly Stable Light-Emitting Diodes", ACS Nano 2021, 15, 6316–6325.
 
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, 11, 1151-1157.
 
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.
 
Akriti, Enzheng Shi, Stephen B. Shiring, Jiaqi Yang, Cindy L. Atencio-Martinez, Biao Yuan, Xiangchen Hu, Yao Gao, Blake P. Finkenauer, Alan J. Pistone, Yi Yu, Peilin Liao, Brett M. Savoie, Letian Dou*; "Layer-by-Layer Anionic Diffusion in Two-Dimensional Halide Perovskite Vertical Heterostructures", Nature Nanotechnology 2021, 16, 584-591.