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Enhanced Visible Photovoltaic Response of TiO<sub>2</sub> Thin Film with an All-Inorganic Donor–Acceptor Type Polyoxometalate

By Jian-Sheng Li (512046), Xiao-Jing Sang (1578376), Wei-Lin Chen (106199), Lan-Cui Zhang (1578367), Zai-Ming Zhu (1578379), Teng-Ying Ma (1578370), Zhong-Min Su (1362675) and En-Bo Wang (1578373)

Abstract

In the field of material chemistry, it is of great significance to develop abundant and sustainable materials for solar energy harvesting and management. Herein, after evaluating the energy band characteristics of 13 kinds of polyoxometalates (POMs), the trisubstituted POM compound K<sub>6</sub>H<sub>4</sub>[α-SiW<sub>9</sub>O<sub>37</sub>Co<sub>3</sub>(H<sub>2</sub>O)<sub>3</sub>]·17H<sub>2</sub>O (SiW<sub>9</sub>Co<sub>3</sub>) was first studied due to its relatively smaller band gap (2.23 eV) and higher lowest unoccupied molecular orbital (LUMO) level (−0.63 V vs NHE). Additionally, the preliminary computational modeling indicated that SiW<sub>9</sub>Co<sub>3</sub> exhibited the donor–acceptor (D–A) structure, in which the cobalt oxygen clusters and tungsten skeletons act as the electron donor and electron acceptor, respectively. By employing SiW<sub>9</sub>Co<sub>3</sub> to modify the TiO<sub>2</sub> film, the visible photovoltaic and photocurrent response were both enhanced, and the light-induced photocurrent at 420 nm was improved by 7.1 times. Moreover, the highly dispersive and small sized SiW<sub>9</sub>Co<sub>3</sub> nanoclusters loading on TiO<sub>2</sub> were successfully achieved by fabricating the nanocomposite film of {TiO<sub>2</sub>/SiW<sub>9</sub>Co<sub>3</sub>}<sub>3</sub> with the layer-by-layer method, which can result in the photovoltaic performance enhancement of dye-sensitized solar cells (DSSCs), of which the overall power conversion efficiency was improved by 25.6% from 6.79% to 8.53% through the synergistic effect of POMs and Ru-complex

Topics: Medicine, Pharmacology, Ecology, Cancer, Space Science, Chemical Sciences not elsewhere classified, cobalt oxygen clusters, material, electron, TiO 2 film, power conversion efficiency, LUMO, SiW 9Co, energy band characteristics, tungsten skeletons act, Enhanced Visible Photovoltaic Response, photovoltaic performance enhancement, photocurrent, NHE, TiO 2, DSSC, donor, SiW 9Co nanoclusters loading, trisubstituted POM compound K 6H
Year: 2015
DOI identifier: 10.1021/acsami.5b03948.s001
OAI identifier: oai:figshare.com:article/2155255
Provided by: FigShare
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