Journal of the American Chemical Society
Journal of the American Chemical Society
5 years ago

Spectrally Switchable Photodetection with Near-Infrared-Absorbing Covalent Organic Frameworks

Spectrally Switchable Photodetection with Near-Infrared-Absorbing Covalent Organic Frameworks
Laura Ascherl, Derya Bessinger, Thomas Bein, Florian Auras
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.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b06599

DOI: 10.1021/jacs.7b06599

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