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Title: Room-Temperature Phototransistor with Negative Photoresponsivity of 10 8 A W -1 Using Fullerene-Sensitized Aligned Carbon Nanotubes

Abstract

Detection of low intensity light down to a few photons requires photodetectors with high gain. In this paper, a new photodetector is reported based on C 60-sensitized aligned carbon nanotube (CNT) transistors with an extremely high responsivity of 10 8 A W -1 (gain > 10 8) in the ultraviolet and visible range, and 720 A W -1 (gain = 940) in the infrared range. In contrast to most sensitized phototransistors that operate on the photogating effect, the new photodetector operates on the modulation of the electrons scattering in the CNTs, leading to negative photoconductivity. Comparison with similar photodetectors using random CNT networks shows the benefit of using aligned CNTs. Finally, at room temperature, the aligned CNT photodetectors are demonstrated to detect a few tens of photons per CNT.

Authors:
 [1]; ORCiD logo [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Defense Advanced Research Projects Agency (DARPA) (United States)
OSTI Identifier:
1474080
Report Number(s):
SAND-2018-10184J
Journal ID: ISSN 1613-6810; 667943
Grant/Contract Number:  
NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Small
Additional Journal Information:
Journal Volume: 14; Journal Issue: 42; Journal ID: ISSN 1613-6810
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; carbon nanotube; fullerene; gain; photodetector

Citation Formats

Bergemann, Kevin, and Léonard, François. Room-Temperature Phototransistor with Negative Photoresponsivity of 108 A W-1 Using Fullerene-Sensitized Aligned Carbon Nanotubes. United States: N. p., 2018. Web. doi:10.1002/smll.201802806.
Bergemann, Kevin, & Léonard, François. Room-Temperature Phototransistor with Negative Photoresponsivity of 108 A W-1 Using Fullerene-Sensitized Aligned Carbon Nanotubes. United States. doi:10.1002/smll.201802806.
Bergemann, Kevin, and Léonard, François. Mon . "Room-Temperature Phototransistor with Negative Photoresponsivity of 108 A W-1 Using Fullerene-Sensitized Aligned Carbon Nanotubes". United States. doi:10.1002/smll.201802806.
@article{osti_1474080,
title = {Room-Temperature Phototransistor with Negative Photoresponsivity of 108 A W-1 Using Fullerene-Sensitized Aligned Carbon Nanotubes},
author = {Bergemann, Kevin and Léonard, François},
abstractNote = {Detection of low intensity light down to a few photons requires photodetectors with high gain. In this paper, a new photodetector is reported based on C60-sensitized aligned carbon nanotube (CNT) transistors with an extremely high responsivity of 108 A W-1 (gain > 108) in the ultraviolet and visible range, and 720 A W-1 (gain = 940) in the infrared range. In contrast to most sensitized phototransistors that operate on the photogating effect, the new photodetector operates on the modulation of the electrons scattering in the CNTs, leading to negative photoconductivity. Comparison with similar photodetectors using random CNT networks shows the benefit of using aligned CNTs. Finally, at room temperature, the aligned CNT photodetectors are demonstrated to detect a few tens of photons per CNT.},
doi = {10.1002/smll.201802806},
journal = {Small},
number = 42,
volume = 14,
place = {United States},
year = {Mon Sep 24 00:00:00 EDT 2018},
month = {Mon Sep 24 00:00:00 EDT 2018}
}

Journal Article:
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Works referenced in this record:

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