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      Photovoltaic enhancement by Au surface-plasmon effect for La doped BiFeO3 films

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          Abstract

          Herein, the photovoltaic (PV) effect of ferroelectric Bi 0.85La 0.15FeO 3 (BLFO) films fabricated through a sol–gel method is investigated.

          Abstract

          Herein, the photovoltaic (PV) effect of ferroelectric Bi 0.85La 0.15FeO 3 (BLFO) films fabricated through a sol–gel method is investigated. The ferroelectric properties of the BLFO films improve compared to the undoped BiFeO 3 films. The application of Au nanoparticles (AuNPs) increases the open circuit voltage ( V OC) and short circuit current density ( J SC) from 0.2 V to 0.3 V and 5.3 μA cm −2 to 18.5 μA cm −2, respectively, which could be attributed to Au surface-plasmon effects. The PV output for the BLFO film can be modulated after applying external poling voltages. Considering the ferroelectric polarization and plasmonic effects, a plausible theoretical model is constructed to depict the physical mechanism of PV enhancement for the BLFO film in detail. This work not only presents a new approach to improve the PV effect of ferroelectric films but also provides important insights into the PV mechanism of ferroelectric films.

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          Plasmon-induced hot-electron generation at nanoparticle/metal-oxide interfaces for photovoltaic and photocatalytic devices

          César Clavero (2014)
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            Steering charge kinetics in photocatalysis: intersection of materials syntheses, characterization techniques and theoretical simulations.

            Song Bai, Jun Jiang, Qun Zhang … (2015)
            Charge kinetics is highly critical in determining the quantum efficiency of solar-to-chemical conversion in photocatalysis, and this includes, but is not limited to, the separation of photoexcited electron-hole pairs, utilization of plasmonic hot carriers and delivery of photo-induced charges to reaction sites, as well as activation of reactants by energized charges. In this review, we highlight the recent progress on probing and steering charge kinetics toward designing highly efficient photocatalysts and elucidate the fundamentals behind the combinative use of controlled synthesis, characterization techniques (with a focus on spectroscopic characterizations) and theoretical simulations in photocatalysis studies. We first introduce the principles of various processes associated with charge kinetics that account for or may affect photocatalysis, from which a set of parameters that are critical to photocatalyst design can be summarized. We then outline the design rules for photocatalyst structures and their corresponding synthetic approaches. The implementation of characterization techniques and theoretical simulations in different steps of photocatalysis, together with the associated fundamentals and working mechanisms, are also presented. Finally, we discuss the challenges and opportunities for photocatalysis research at this unique intersection as well as the potential impact on other research fields.
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              Perovskite oxides for visible-light-absorbing ferroelectric and photovoltaic materials.

              Ilya Grinberg, D Vincent West, María Torres … (2013)
              Ferroelectrics have recently attracted attention as a candidate class of materials for use in photovoltaic devices, and for the coupling of light absorption with other functional properties. In these materials, the strong inversion symmetry breaking that is due to spontaneous electric polarization promotes the desirable separation of photo-excited carriers and allows voltages higher than the bandgap, which may enable efficiencies beyond the maximum possible in a conventional p-n junction solar cell. Ferroelectric oxides are also stable in a wide range of mechanical, chemical and thermal conditions and can be fabricated using low-cost methods such as sol-gel thin-film deposition and sputtering. Recent work has shown how a decrease in ferroelectric layer thickness and judicious engineering of domain structures and ferroelectric-electrode interfaces can greatly increase the current harvested from ferroelectric absorber materials, increasing the power conversion efficiency from about 10(-4) to about 0.5 per cent. Further improvements in photovoltaic efficiency have been inhibited by the wide bandgaps (2.7-4 electronvolts) of ferroelectric oxides, which allow the use of only 8-20 per cent of the solar spectrum. Here we describe a family of single-phase solid oxide solutions made from low-cost and non-toxic elements using conventional solid-state methods: [KNbO3]1 - x[BaNi1/2Nb1/2O3 - δ]x (KBNNO). These oxides exhibit both ferroelectricity and a wide variation of direct bandgaps in the range 1.1-3.8 electronvolts. In particular, the x = 0.1 composition is polar at room temperature, has a direct bandgap of 1.39 electronvolts and has a photocurrent density approximately 50 times larger than that of the classic ferroelectric (Pb,La)(Zr,Ti)O3 material. The ability of KBNNO to absorb three to six times more solar energy than the current ferroelectric materials suggests a route to viable ferroelectric semiconductor-based cells for solar energy conversion and other applications.
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                Author and article information

                Journal
                Journal ID (publisher-id): JMCCCX
                Title: J. Mater. Chem. C
                Abbreviated Title: J. Mater. Chem. C
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 2050-7526
                ISSN (Electronic): 2050-7534
                Publication date Created: 2017
                Publication date (Electronic): 2017
                Volume: 5
                Issue: 40
                Pages: 10615-10623
                Affiliations
                [1 ]Henan Key Laboratory of Photovoltaic Materials
                [2 ]School of Physics and Electronics
                [3 ]Henan University
                [4 ]Kaifeng 475004
                [5 ]China
                [6 ]School of Materials Science and Engineering
                [7 ]Nanjing University of Science and Technology
                [8 ]Nanjing 210094
                [9 ]Institute of Solid State Physics
                [10 ]Key Lab of Materials Physics
                [11 ]CAS
                [12 ]Hefei 230031
                Article
                DOI: 10.1039/C7TC03371K
                SO-VID: 602ae5c4-c322-407c-be95-1b565b84608c
                Copyright © © 2017
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