Cited 0 time in webofscience Cited 1 time in scopus

Graphene-mediated enhanced Raman scattering and coherent light lasing from CsPbI3 perovskite nanorods

Title
Graphene-mediated enhanced Raman scattering and coherent light lasing from CsPbI3 perovskite nanorods
Authors
Kim, Jung HyeLe, Quyet VanNguyen, Thang PhanLee, Tae HyungJang, Ho WonYun, Won SeokJeong, Soon MoonLee, JaeDongKim, Soo YoungKim, Hyunmin
DGIST Authors
Kim, Jung Hye; Le, Quyet Van; Nguyen, Thang Phan; Lee, Tae Hyung; Jang, Ho Won; Yun, Won Seok; Jeong, Soon MoonLee, JaeDong; Kim, Soo Young; Kim, Hyunmin
Issue Date
2020-04
Citation
Nano Energy, 70, 104497
Type
Article
Article Type
Article
Author Keywords
Perovskite nanorodsGrapheneSERSRamanLuminescence
Keywords
LEAD HALIDE PEROVSKITESSINGLESPECTROSCOPYEMISSIONBRCL
ISSN
2211-2855
Abstract
Graphene-enhanced Raman scattering has been studied as an optical technique related to the selective electron transfer from graphene to the valence band of the contacted molecule, inducing a pileup of electrons within the conduction band and a “photogating effect” for subsequently illuminated light. Herein, we studied the Raman spectroscopy of CsPbI3 nanorods sandwiched between two layers of graphene, revealing that weak coherent lasing also occurs. The photoluminescence intensity of α-phase CsPbI3 nanorods drastically decreased with increasing graphene coverage, particularly on the top, leading to Raman modes at the first (~241 and ~312 cm−1) and second (~640 cm−1) overtones of polymeric iodides, as well as at ~3492 cm−1. First-principle calculations reveal that the ~3492-cm−1 mode originates from the stimulated coherent light emissions of the highly populated electrons accumulated in the CsPbI3 conduction band, which form because of the electronic resonance induced in the Pb and I degenerate states. © 2020
URI
http://hdl.handle.net/20.500.11750/11512
DOI
10.1016/j.nanoen.2020.104497
Publisher
Elsevier BV
Related Researcher
  • Author Lee, JaeDong Light and Matter Theory Laboratory
  • Research Interests Theoretical Condensed Matter Physics; Ultrafast Dynamics and Optics; Nonequilibrium Phenomena
Files:
There are no files associated with this item.
Collection:
Division of Energy Technology1. Journal Articles
Department of Emerging Materials ScienceLight and Matter Theory Laboratory1. Journal Articles
Division of Biotechnology1. Journal Articles


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE