Extremely efficient photocurrent generation in carbon nanotube photodiodes enabled by a strong axial electric field

Citeable URL: https://ir.library.oregonstate.edu/concern/articles/m039kb73p

Descriptions

Attribute Name	Values
Creator	McCulley, Daniel R. Senger, Mitchell J. Bertoni, Andrea Perebeinos., Vasili
Abstract	Carbon nanotube (CNT) photodiodes have potential to convert light into electrical current with high efficiency. However, previous experiments have revealed photocurrent quantum yield (PCQY) well below 100%. In this work, we show that axial electric field increases the PCQY of CNT photodiodes. In optimal conditions our data suggest PCQY > 100%. We studied, both experimentally and theoretically, CNT photodiodes at room temperature using optical excitation corresponding to the S22, S33 and S44 exciton resonances. The axial electric field inside the pn junction was controlled using split gates that are capacitively coupled to the suspended CNT. Our results give new insight into the photocurrent generation pathways in CNTs, and the field dependence and diameter dependence of PCQY. Keywords: carbon nanotube, exciton dissociation, carrier multiplication, scanning photocurrent microscopy
License	All rights reserved
Resource Type	Article
DOI	https://doi.org/10.1021/acs.nanolett.9b04151
Date Issued	2019
Journal Title	Nano Letters
Journal Volume	20
Journal Issue/Number	1
Academic Affiliation	Physics
Rights Statement	In Copyright
Publisher	Oregon State University
Language	English [eng]
Accessibility Feature	unknown

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