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A high-performance photodetector based on small-bundled single-wall carbon nanotube film/silicon heterojunctions
Single-wall carbon nanotube (SWCNT)/n-type silicon (n-Si) heterojunctions with a high photoresponsivity are considered promising for use in photodetectors. However, the performance of large-area SWCNT film/n-Si heterojunction-based photodetectors has been much lower than that fabricated using isolat...
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Published in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-08, Vol.1 (32), p.16986-16994 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Single-wall carbon nanotube (SWCNT)/n-type silicon (n-Si) heterojunctions with a high photoresponsivity are considered promising for use in photodetectors. However, the performance of large-area SWCNT film/n-Si heterojunction-based photodetectors has been much lower than that fabricated using isolated SWCNTs, where the efficient assembly of SWCNT networks with the desired structure is a key issue. In this study, we prepared a small-bundled SWCNT (SB-SWCNT) film with a carbon-welding structure at tube-tube junctions, which greatly decreased the contact resistance and improved the work function. The fabricated SB-SWCNT film/n-Si heterojunction-based photodetectors showed a very high detectability of 4.2 × 10
13
Jones for an 890 nm laser with 0 bias, much higher than that of commercial photodetectors. The detectors also demonstrated good stability with a 97%
R
value retained after being exposed in air for 30 days, and a broad spectral response (540-1090 nm).
A single-wall carbon nanotube/Si heterojunction photodetector fabricated using a small-bundled SWCNT film with a carbon-welding structure at tube/tube junctions shows a high responsivity (
R
) of 0.43 A W
−1
and high detectability (
D
*) of 4.2 × 10
13
Jones. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/d2ta04209f |