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Title: Observation of phonon cascades in Cu-doped colloidal quantum wells
Authors: Yu, Junhong
Hu, Sujuan
Gao, Huayu
Delikanli, Savas
Liu, Baiquan
Jasieniak, Jacek J.
Sharma, Manoj
Demir, Hilmi Volkan
Keywords: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Issue Date: 2022
Source: Yu, J., Hu, S., Gao, H., Delikanli, S., Liu, B., Jasieniak, J. J., Sharma, M. & Demir, H. V. (2022). Observation of phonon cascades in Cu-doped colloidal quantum wells. Nano Letters, 22(24), 10224-10231.
Project: M21J9b0085 
Journal: Nano Letters 
Abstract: Electronic doping has endowed colloidal quantum wells (CQWs) with unique optical and electronic properties, holding great potential for future optoelectronic device concepts. Unfortunately, how photogenerated hot carriers interact with phonons in these doped CQWs still remains an open question. Here, through investigating the emission properties, we have observed an efficient phonon cascade process (i.e., up to 27 longitudinal optical phonon replicas are revealed in the broad Cu emission band at room temperature) and identified a giant Huang-Rhys factor (S ≈ 12.4, more than 1 order of magnitude larger than reported values of other inorganic semiconductor nanomaterials) in Cu-doped CQWs. We argue that such an ultrastrong electron-phonon coupling in Cu-doped CQWs is due to the dopant-induced lattice distortion and the dopant-enhanced density of states. These findings break the widely accepted consensus that electron-phonon coupling is typically weak in quantum-confined systems, which are crucial for optoelectronic applications of doped electronic nanomaterials.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.2c03427
Schools: School of Electrical and Electronic Engineering 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © 2022 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SPMS Journal Articles

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