Spectrally Switchable Photodetection with Near-Infrared-Absorbing Covalent Organic Frameworks
Most covalent organic frameworks (COFs) to date are made from relatively small aromatic subunits, which can only absorb the high-energy part of the visible spectrum. We have developed near-infrared-absorbing low bandgap COFs by incorporating donor-acceptor-type isoindigo- and thienoisoindigo-based building blocks. The new materials are intensely colored solids with a high degree of long-range order and a pseudo-quadratic pore geometry. Growing the COF as a vertically oriented thin film allows for the construction of an ordered interdigitated heterojunction through infiltration with a complementary semiconductor. Applying a thienoisoindigo-COF:fullerene heterojunction as the photoactive component, we realized the first COF-based UV- to NIR-responsive photodetector. We found that the spectral response of the device is reversibly switchable between blue- and red-sensitive, and green- and NIR-responsive. To the best of our knowledge, this is the first time that such nearly complete inversion of spectral sensitivity of a photodetector has been achieved. This effect could lead to potential applications in information technology or spectral imaging.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2017 |
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| Erschienen: |
2017 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:139 |
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| Enthalten in: |
Journal of the American Chemical Society - 139(2017), 34 vom: 30. Aug., Seite 12035-12042 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Bessinger, Derya [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 15.05.2018 Date Revised 25.02.2020 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1021/jacs.7b06599 |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM275021548 |
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| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Most covalent organic frameworks (COFs) to date are made from relatively small aromatic subunits, which can only absorb the high-energy part of the visible spectrum. We have developed near-infrared-absorbing low bandgap COFs by incorporating donor-acceptor-type isoindigo- and thienoisoindigo-based building blocks. The new materials are intensely colored solids with a high degree of long-range order and a pseudo-quadratic pore geometry. Growing the COF as a vertically oriented thin film allows for the construction of an ordered interdigitated heterojunction through infiltration with a complementary semiconductor. Applying a thienoisoindigo-COF:fullerene heterojunction as the photoactive component, we realized the first COF-based UV- to NIR-responsive photodetector. We found that the spectral response of the device is reversibly switchable between blue- and red-sensitive, and green- and NIR-responsive. To the best of our knowledge, this is the first time that such nearly complete inversion of spectral sensitivity of a photodetector has been achieved. This effect could lead to potential applications in information technology or spectral imaging | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 700 | 1 | |a Ascherl, Laura |e verfasserin |4 aut | |
| 700 | 1 | |a Auras, Florian |e verfasserin |4 aut | |
| 700 | 1 | |a Bein, Thomas |e verfasserin |4 aut | |
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