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Title: Excitons in 2D perovskites for ultrafast terahertz photonic devices
Authors: Kumar, Abhishek
Solanki, Ankur
Manjappa, Manukumara
Ramesh, Sankaran
Srivastava, Yogesh Kumar
Agarwal, Piyush
Sum, Tze Chien
Singh, Ranjan
Keywords: Science::Physics
Issue Date: 2020
Source: Kumar, A., Solanki, A., Manjappa, M., Ramesh, S., Srivastava, Y. K., Agarwal, P., . . . Singh, R. (2020). Excitons in 2D perovskites for ultrafast terahertz photonic devices. Science Advances, 6(8), eaax8821-. doi:10.1126/sciadv.aax8821
Project: MOE2016-T3-1-006
Journal: Science Advances
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.
ISSN: 2375-2548
DOI: 10.1126/sciadv.aax8821
DOI (Related Dataset):
Schools: School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Organisations: Centre for Disruptive Photonic Technologies
The Photonics Institute
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2020 The Author(s), some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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