ORCID Profile
0000-0001-8328-443X
Current Organisation
Technische Universiteit Delft
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Publisher: American Chemical Society (ACS)
Date: 23-10-2018
Publisher: American Chemical Society (ACS)
Date: 13-12-2019
Publisher: American Chemical Society (ACS)
Date: 24-09-2019
Publisher: American Chemical Society (ACS)
Date: 19-11-2019
Publisher: American Chemical Society (ACS)
Date: 02-04-2019
Publisher: American Chemical Society (ACS)
Date: 23-10-2018
Publisher: American Chemical Society (ACS)
Date: 14-12-2022
Publisher: American Chemical Society (ACS)
Date: 15-05-2023
Publisher: American Chemical Society (ACS)
Date: 26-10-2012
DOI: 10.1021/NL303008Y
Abstract: We report on a photodetector in which colloidal quantum dots directly bridge nanometer-spaced electrodes. Unlike in conventional quantum-dot thin film photodetectors, charge mobility no longer plays a role in our quantum-dot junctions as charge extraction requires only two in idual tunnel events. We find an efficient photoconductive gain mechanism with external quantum efficiencies of 38 electrons-per-photon in combination with response times faster than 300 ns. This compact device-architecture may open up new routes for improved photodetector performance in which efficiency and bandwidth do not go at the cost of one another.
Publisher: American Chemical Society (ACS)
Date: 02-05-2018
DOI: 10.1021/JACS.8B01347
Publisher: American Chemical Society (ACS)
Date: 30-10-2018
DOI: 10.1021/JACS.8B07783
Publisher: American Chemical Society (ACS)
Date: 29-10-2018
Publisher: Springer Science and Business Media LLC
Date: 29-03-2016
DOI: 10.1038/SREP23676
Abstract: Metal-organic frameworks (MOFs) containing d 0 metals such as NH 2 -MIL-125(Ti), NH 2 -UiO-66(Zr) and NH 2 -UiO-66(Hf) are among the most studied MOFs for photocatalytic applications. Despite structural similarities, we demonstrate that the electronic properties of these MOFs are markedly different. As revealed by quantum chemistry, EPR measurements and transient absorption spectroscopy, the highest occupied and lowest unoccupied orbitals of NH 2 -MIL-125(Ti) promote a long lived ligand-to-metal charge transfer upon photoexcitation, making this material suitable for photocatalytic applications. In contrast, in case of UiO materials, the d -orbitals of Zr and Hf, are too low in binding energy and thus cannot overlap with the π* orbital of the ligand, making both frontier orbitals localized at the organic linker. This electronic reconfiguration results in short exciton lifetimes and diminishes photocatalytic performance. These results highlight the importance of orbital contributions at the band edges and delineate future directions in the development of photo-active hybrid solids.
Publisher: American Chemical Society (ACS)
Date: 16-03-2020
No related grants have been discovered for Arjan Houtepen.