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Title: Dominant factors limiting the optical gain in layered two-dimensional halide perovskite thin films
Authors: Chong, Wee Kiang
Thirumal, Krishnamoorthy
Giovanni, David
Goh, Teck Wee
Liu, Xinfeng
Mathews, Nripan
Mhaisalkar, Subodh
Sum, Tze Chien
Keywords: Photoluminescence spectroscopy
Amplified spontaneous emission
Two dimensional
Issue Date: 2016
Source: Chong, W. K., Thirumal, K., Giovanni, D., Goh, T. W., Liu, X., Mathews, N., . . . Sum, T. C. (2016). Dominant factors limiting the optical gain in layered two-dimensional halide perovskite thin films. Physical Chemistry Chemical Physics, 21(18), 14701-14708. doi: 10.1039/C6CP01955B
Series/Report no.: Physical Chemistry Chemical Physics
Abstract: Semiconductors are ubiquitous gain media for coherent light sources. Solution-processed three-dimensional (3D) halide perovskites (e.g., CH3NH3PbI3) with their outstanding room temperature optical gain properties are the latest members of this family. Their two-dimensional (2D) layered perovskite counterparts with natural multiple quantum well structures exhibit strong light–matter interactions and intense excitonic luminescence. However, despite such promising traits, there have been no reports on room temperature optical gain in 2D layered perovskites. Herein, we reveal the challenges towards achieving amplified spontaneous emission (ASE) in the archetypal (C6H5C2H4NH3)2PbI4 (or PEPI) system. Temperature-dependent transient spectroscopy uncovers the dominant free exciton trapping and bound biexciton formation pathways that compete effectively with biexcitonic gain. Phenomenological rate equation modeling predicts a large biexciton ASE threshold of ∼1.4 mJ cm−2, which is beyond the damage threshold of these materials. Importantly, these findings would rationalize the difficulties in achieving optical gain in 2D perovskites and provide new insights and suggestions for overcoming these challenges.
ISSN: 1463-9076
DOI: 10.1039/C6CP01955B
DOI (Related Dataset):
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: Research Techno Plaza 
Energy Research Institute @ NTU (ERI@N) 
Rights: © 2016 The Author(s) (Royal Society of Chemistry). This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
IGS Journal Articles
MSE Journal Articles
SPMS Journal Articles

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