한성환
2017-06-09T01:50:18Z
2017-06-09T01:50:18Z
2015-09
JOURNAL OF MATERIALS CHEMISTRY A, v. 3, NO 45, Page. 22669-22676
2050-7488
2050-7496
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TA/C5TA07180A#!divAbstract
http://hdl.handle.net/20.500.11754/27708
Efficient separation of charges and their mobility are key challenges in metal-organic-framework (MOF) based devices. In the present study, thin films of cobalt-based metal organic frameworks (MOFs) are synthesized using a layer-by-layer technique, and their electrical/optoelectronic properties are studied. The as-prepared MOF films show electrically insulating behavior, which after hole doping demonstrate p-type conduction behaviour. The measured HOMO-LUMO energy states of the MOF films are found to be well matched for sensitizing TiO2, and the photoluminescence quenching experiment demonstrates a facile photoelectron transfer path from the doped frameworks to TiO2. Consequently, the doped MOFs are employed successfully as light harvesting and charge transporting active layers in a fully devised TiO2-based solar cell. Two different organic ligands viz., benzene dicarboxylic acid and naphthalenedicarboxylic acid are used to synthesize two kinds of Co-MOFs having different geometrical dimensions of unit cells and pores, and their influence on hole doping and charge transportation is studied. Under optimized conditions, the Co-MOF based device demonstrates a solar-to-electric energy conversion efficiency of 1.12% with a short circuit current of 2.56 mA cm(-2), showing promising future prospects of the application of Co-MOFs in photovoltaic devices. Further, the photovoltaic performance of the Co-MOF based device is comparatively studied with that of the previously reported Cu-MOF and Ru-MOF based similar devices, and the influence of different metal centers of MOFs on their light harvesting performance is discussed.
This research was supported by the KIST Institutional Program (2E23964), and the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013009768). One of the authors (N. K. Shrestha) acknowledges "The Korean Federation of Science and Technology Societies" for the support received under Brain Pool program.
en
ROYAL SOC CHEMISTRY
METAL-ORGANIC-FRAMEWORKS
SECONDARY-BUILDING UNITS
COORDINATION POLYMERS
ENERGY-TRANSFER
THIN-FILMS
SUPERCAPACITORS
PHOTOCATALYSIS
CONDUCTIVITY
GENERATION
PROPERTY
Facile interfacial charge transfer across hole doped cobalt-based MOFs/TiO2 nano-hybrids making MOFs light harvesting active layers in solar cells
Article
45
3
10.1039/c5ta07180a
22669-22676
JOURNAL OF MATERIALS CHEMISTRY A
Lee, Deok Yeon
Lim, Iseul
Shin, Chan Yong
Patil, Supriya A.
Lee, Wonjoo
Shrestha, Nabeen K.
Lee, Joong Kee
Han, Sung-Hwan
2015000269
S
COLLEGE OF NATURAL SCIENCES[S]
DEPARTMENT OF CHEMISTRY
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