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Changes of dye adsorption state induced by ferroelectric polarization to improve photoelectric performance

Abstract

Coupling ferroelectric materials with semiconductor materials can improve the performance of photovoltaic cells. The BaTiO3/TiO2(n) (B/T(n)) photoanode of dye-sensitized solar cells (DSSCs) is composed of BaTiO3 core, a high performance and frequently-used ferroelectric material, and TiO2 nanoparticle, a common semiconductor material. A hysteresis loop, 105 μC/cm2 remnant polarization and 7 kV/cm coercive field of the photoanode demonstrate its ferroelectricity. The short-circuit current density (Jsc) of dye-sensitized photoanode after polarized (B/T(n)PD) is superior to that of unpolarized (B/T(n)D) about 2 mA cm-2, regardless of the direction of the polarization. The DSSC based on B/T(4)PD photoanode exhibits the power conversion efficiency (PCE) of 7.29% and the Jsc of 14.44 mA cm-2. The reflection spectroscopy, fourier transform infrared spectroscopy (FTIR) and intensity modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) are measured to investigate the light absorption, charge injection and separation processes in B/T(n). Spontaneous polarization changes the adsorption state of dye, which increases light absorption efficiency and the electron injection efficiency, incident light to photocurrent efficiency (IPCE) and Jsc. The discovery of this paper provides a method for modulating the interaction of adsorbed molecules with solids by means of electric field changes. This study deepens the understanding of the mechanism of charge transport and photovoltage generation in photovoltaic cells.

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Publication details

The article was received on 25 Jul 2018, accepted on 01 Nov 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA07180B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Changes of dye adsorption state induced by ferroelectric polarization to improve photoelectric performance

    D. Xie, Y. Lin, N. Fu, P. Ma and X. zhou, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07180B

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