Terahertz Excitonics in Carbon Nanotubes: Exciton Autoionization and Multiplication

Excitons play major roles in optical processes in modern semiconductors, such as single-wall carbon nanotubes (SWCNTs), transition metal dichalcogenides, and 2D perovskite quantum wells. They possess extremely large binding energies (>100~meV), dominating absorption and emission spectra even at h...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2020-04
Main Authors: Filchito Renee G Bagsican, Wais, Michael, Komatsu, Natsumi, Gao, Weilu, Weber, Lincoln W, Serita, Kazunori, Murakami, Hironaru, Held, Karsten, Hegmann, Frank A, Tonouchi, Masayoshi, Kono, Junichiro, Kawayama, Iwao, Battiato, Marco
Format: Article
Language:English
Subjects:
Autoionization
Bias
Binding energy
Chirality
Current carriers
Electronic devices
Emission analysis
Emission spectra
Emitters
Emitters (electron)
Energy conservation
Excitons
Kinetic energy
Momentum
Multi wall carbon nanotubes
Multiplication
Optoelectronic devices
Perovskites
Photoelectric effect
Photoelectric emission
Photovoltaic cells
Quantum wells
Single wall carbon nanotubes
Solar cells
Transition metal compounds
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Excitons play major roles in optical processes in modern semiconductors, such as single-wall carbon nanotubes (SWCNTs), transition metal dichalcogenides, and 2D perovskite quantum wells. They possess extremely large binding energies (>100~meV), dominating absorption and emission spectra even at high temperatures. The large binding energies imply that they are stable, that is, hard to ionize, rendering them seemingly unsuited for optoelectronic devices that require mobile charge carriers, especially terahertz emitters and solar cells. Here, we have conducted terahertz emission and photocurrent studies on films of aligned single-chirality semiconducting SWCNTs and find that excitons autoionize, i.e., spontaneously dissociate into electrons and holes. This process naturally occurs ultrafast (
ISSN:2331-8422
DOI:10.48550/arxiv.2004.02615