A long-term stable Pt counter electrode modified by POM-based multilayer film for high conversion efficiency dye-sensitized solar cells

Department of Chemistry, Key Laboratory of Polyoxometalates Science of Ministry of Education, Northeast Normal University, Changchun, 130024, China.
Dalton Transactions (Impact Factor: 4.2). 01/2012; 41(8):2227-30. DOI: 10.1039/c2dt11897a
Source: PubMed

ABSTRACT A long-term stable Pt counter electrode modified by POM-based multilayer film has been fabricated by the electrochemical deposition method, which can markedly increase short-circuit photocurrent, open-circuit voltage and the conversion efficiency when used in dye-sensitized solar cells (DSSCs).

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    • "[23] [24] [25] In previous research, POMs have been introduced into the solar photovoltaic system, which act as the electron acceptor and play the role of electron transmission as mediators, which are based on the consideration of the LUMO energy level of these POMs that are lower than that of conduction band of TiO 2 .[26] [27] [28] [29] [30] Meanwhile, POMs would transform into the electron donor after they are reduced to heteropoly blue.[31] However, the energy level including LUMO and HOMO level of POMs could be adjusted by controlling their structures or compositions and meanwhile the light response of POMs could be regulated by introducing certain transitional elements.[32] "
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    ABSTRACT: Abstract Keggin-type polyoxometalates (POMs) based photosensitizer [(CH3)4N]5[PW11O39RhCH2COOH]∙6H2O (PW11Rh-COOH) was firstly explored for assembling the POMs sensitized solar cells (PSSC). Electrochemical measurement, UV–vis diffuse reflectance spectrum, Surface photovoltage spectrum, and X-ray photoelectron spectroscopy demonstrated that PW11Rh-COOH displayed higher photovoltaic response than that of other POMs because of the better visible-light response, energy level matching and higher carrier separation efficiency.
    Inorganic Chemistry Communications 12/2013; 38:78-82. DOI:10.1016/j.inoche.2013.10.027 · 1.78 Impact Factor
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    • "Polyoxometalates (POMs) are an important and structurally diverse class of metal-oxide clusters which have been found to be extremely versatile inorganic building blocks for the construction of functional materials with potential applications in catalysis [20] [21], medicine [22], and materials science [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36]. Recently, several groups have incorporated POM into a dye-sensitized solar cell, and observed enhanced photovoltaic response [28] [29] [30] [31] [32] [33] [34] [35] [36]. These facts could provide important fundamental data for practical applications of materials in photoelectric conversion devices. "
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    ABSTRACT: A photoelectric conversion film consisting of sandwich-type tetracadmium(II) tungstophosphorate [P2W18Cd4(H2O)2O68]10− (P2W18Cd4) and a bichromophore hemicyanine of (E)-1,1′-(hexane-1,6-diyl)bis(4-((E)-2-(4-(dimethylamino)naphthalen-1-yl)vinyl)pyridinium) bromide (N6) was prepared by electrostatic self-assembly technique, and characterized by UV–vis spectroscopy, cyclic voltammetry and photoelectrochemistry. The UV–visible spectra showed that the film was uniformly deposited and N6 molecules formed J-aggregations in the films. The cyclic voltammetry showed that the P2W18Cd4 and N6 in the films were electrochemically active with surface-confined characteristics. As irradiated with white light, the (P2W18Cd4/N6) monolayer film gave stable cathodic photocurrent that is 2.4- and 6.7-fold as great as electrostatically self-assembled monolayer film of (P2W18Cd4/H6) {H6 = (E)-1,1′-(hexane-1,6-diyl)bis(4-(4-(dimethylamino)styryl)pyridinium) bromide} and Langmuir–Blodgett monolayer film of analogous hemicyanine (E)-4-(2-(4-(dimethylamino)naphthalen-1-yl)vinyl)-1-octadecylpyridinium iodide. The photocurrent action spectrum indicated that the cathodic photocurrent was generated based on charge transfer excitation of the N6 in the film. The effects of applied bias voltages, electron acceptor, and layer numbers of the (P2W18Cd4/N6)n films on photocurrent generation of (P2W18Cd4/N6)n film were examined.
    Electrochimica Acta 03/2013; 92:236–242. DOI:10.1016/j.electacta.2012.12.109 · 4.50 Impact Factor
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    ABSTRACT: A series of photoelectric conversion films consisting of sandwich-type polyoxometalates [P(2)W(18)M(4)(H(2)O)(2)O(68)](10-) (P(2)W(18)M(4), M=Ni, Cu, Zn) and a bichromophore hemicyanine of (E)-1,1'-(hexane-1,6-diyl)bis(4-(4-(dimethylamino)styryl)pyridinium) bromide (H(6)) were prepared on quartz and indium-tin-oxide (ITO)-coated glass substrates by electrostatic self-assembly. The UV-visible absorption spectroscopy showed that the films were uniformly deposited with the visible absorption bands for H(6) in the films exhibiting different extents of bathochromic shifts with respect to H(6) aqueous solution. The (P(2)W(18)M(4)/H(6))(n) films exhibited cathodic photocurrents as irradiated with white light. The photocurrent action spectra were found to match with the absorption spectra of the films, indicating that the cathodic photocurrents were generated based on intramolecular charge transfer excitation of the H(6) in the films. The photocurrents were found to strongly depend on the transition metal ions M in (P(2)W(18)M(4)/H(6))(n) films. The effects of applied bias voltages, electron acceptor added in the electrolyte, and layer numbers of the films on photocurrent generation of (P(2)W(18)M(4)/H(6))(n) films were also examined, and photoelectric mechanism discussed.
    Journal of Colloid and Interface Science 11/2012; 393(1). DOI:10.1016/j.jcis.2012.10.065 · 3.37 Impact Factor
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