Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 28, Pages 9590-9595Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201904475
Keywords
C-60 fullerene; density functional theory; metal-organic frameworks (MOFs); photoconduction; porphyrin
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Funding
- Chinese Scholarship Council (CSC)
- M-ERA.NET MODIGLIANI
- Ministry of Science, Research and the Arts Baden-Wurttemberg
- DFG (Deutsche Forschungsgemeinschaft)
- DFG through SPP COORNET
- JSPS (KAKENHI) [JP18K14198, JP18H03898]
- Volkswagen foundation
- DFG [HE7036/5]
- [SFB 1176]
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Photoconductivity is a characteristic property of semi-conductors. Herein, we present a photo-conducting crystalline metal-organic framework (MOF) thin film with an on-off photocurrent ratio of two orders of magnitude. These oriented, surface-mounted MOF thin films (SURMOFs), contain porphyrin in the framework backbone and C-60 guests, loaded in the pores using a layer-by-layer process. By comparison with results obtained for reference MOF structures and based on DFT calculations, we conclude that donor-acceptor interactions between the porphyrin of the host MOF and the C-60 guests give rise to a rapid charge separation. Subsequently, holes and electrons are transported through separate channels formed by porphyrin and by C-60, respectively. The ability to tune the properties and energy levels of the porphyrin and fullerene, along with the controlled organization of donor-acceptor pairs in this regular framework offers potential to increase the photoconduction on-off ratio.
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