Excitons in 2D perovskites for ultrafast terahertz photonic devices

Science Advances
Abhishek KumarRanjan Singh

Abstract

In recent years, two-dimensional (2D) Ruddlesden-Popper perovskites have emerged as promising candidates for environmentally stable solar cells, highly efficient light-emitting diodes, and resistive memory devices. The remarkable existence of self-assembled quantum well (QW) structures in solution-processed 2D perovskites offers a diverse range of optoelectronic properties, which remain largely unexplored. Here, we experimentally observe ultrafast relaxation of free carriers in 20 ps due to the quantum confinement of free carriers in a self-assembled QW structures that form excitons. Furthermore, hybridizing the 2D perovskites with metamaterials on a rigid and a flexible substrate enables modulation of terahertz fields at 50-GHz modulating speed, which is the fastest for a solution-processed semiconductor-based photonic device. Hence, an exciton-based ultrafast response of 2D perovskites opens up large avenues for a wide range of scalable dynamic photonic devices with potential applications in flexible photonics, ultrafast wavefront control, and short-range wireless terahertz communications.

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Citations

Jul 19, 2020·Optics Express·Lauren GingrasJean-Michel Ménard
Jun 9, 2020·The Journal of Chemical Physics·Giulia FolpiniEugenio Cinquanta
Feb 4, 2021·Nanomaterials·Petr A ObraztsovVladimir V Bukin
Aug 26, 2020·The Journal of Physical Chemistry Letters·Andrés Burgos-CaminalJacques-E Moser
Sep 8, 2021·The Journal of Physical Chemistry Letters·Himangshu Jyoti GogoiAnkur Solanki

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Methods Mentioned

BETA
x-ray diffraction
biosensors

Software Mentioned

CST

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