Facile interfacial charge transfer across hole doped cobalt-based MOFs/TiO2 nano- hybrids leading to MOFs as light harvesting active layer in solar cell

Title
Facile interfacial charge transfer across hole doped cobalt-based MOFs/TiO2 nano- hybrids leading to MOFs as light harvesting active layer in solar cell
Author
Supriya A. Patil
Keywords
METAL-ORGANIC-FRAMEWORKS; SECONDARY-BUILDING UNITS; COORDINATION POLYMERS; ENERGY-TRANSFER; THIN-FILMS; SUPERCAPACITORS; PHOTOCATALYSIS; CONDUCTIVITY; GENERATION; PROPERTY
Issue Date
2015-10
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, Issue 45, 2015, Page. 22669-22676
Abstract
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.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TA/C5TA07180A#!divAbstracthttp://hdl.handle.net/20.500.11754/28294
ISSN
2050-7488; 2050-7496
DOI
10.1039/c5ta07180a
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RESEARCH INSTITUTE[S](부설연구소) > ETC
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