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Photoconductivity in Metal–Organic Framework (MOF) Thin Films
Author(s) -
Liu Xiaojing,
Kozlowska Mariana,
Okkali Timur,
Wagner Danny,
Higashino Tomohiro,
BrennerWeiß Gerald,
Marschner Stefan M.,
Fu Zhihua,
Zhang Qiang,
Imahori Hiroshi,
Bräse Stefan,
Wenzel Wolfgang,
Wöll Christof,
Heinke Lars
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201904475
Subject(s) - porphyrin , photocurrent , photoconductivity , materials science , acceptor , electron acceptor , thin film , metal organic framework , layer (electronics) , fullerene , optoelectronics , photochemistry , nanotechnology , chemistry , organic chemistry , physics , adsorption , condensed matter physics
Abstract 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.