Enhancement of Photocurrent in Ferroelectric Films Via the Incorporation of Narrow Bandgap Nanoparticles

Yang, Xiaoluan; Su, Xiaodong; Shen, Mingrong; Zheng, Fengang; Xin, Yu; Zhang, Lu; Hua, Muchuan; Chen, Yajie; Harris, V. G.

doi:10.1002/adma.201104078

Cited by 117 publications

(60 citation statements)

References 31 publications

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“…(Incidentally, this is expected to be a general problem for low E g FE tailored to the photovoltaic applications1237. Even in BiFeO 3 which has a higher E g , efforts to increase its conductivity to improve photovoltaic responses inevitably render it impossible for manifesting saturated P-E loops383940). Taken into account the structural, dielectric, piezoelectric and remnant polarization data, we may conclude that the low temperature orthorhombic phase is a canted FE, which probably transforms to an antiferroelectric orthorhombic phase above 780 K and finally to a paraelectric-like monoclinic phase above 850 K.…”

Section: Resultsmentioning

confidence: 99%

New high Tc multiferroics KBiFe2O5 with narrow band gap and promising photovoltaic effect

Zhang

et al. 2013

Sci Rep

208

131

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Intrinsic polarization of ferroelectrics (FE) helps separate photon-generated charge carriers thus enhances photovoltaic effects. However, traditional FE with transition-metal cations (M) of d0 electron in MO6 network typically has a band gap (Eg) exceeding 3.0 eV. Although a smaller Eg (2.6 eV) can be obtained in multiferroic BiFeO3, the value is still too high for optimal solar energy applications. Computational “materials genome” searches have predicted several exotic MO6 FE with Eg < 2.0 eV, all thus far unconfirmed because of synthesis difficulties. Here we report a new FE compound with MO4 tetrahedral network, KBiFe2O5, which features narrow Eg (1.6 eV), high Curie temperature (Tc ~ 780 K) and robust magnetic and photoelectric activities. The high photovoltage (8.8 V) and photocurrent density (15 μA/cm2) were obtained, which is comparable to the reported BiFeO3. This finding may open a new avenue to discovering and designing optimal FE compounds for solar energy applications.

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Section: Resultsmentioning

confidence: 99%

New high Tc multiferroics KBiFe2O5 with narrow band gap and promising photovoltaic effect

Zhang

et al. 2013

Sci Rep

208

131

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“…Since FE polarization enables the separation of photo-induced charge carriers, very large photovoltages and efficient photocatalysis can be achieved [7–11]. The potential of such effects for clean energy and environment applications using solar light has renewed interest in FEs and stimulated research on innovative methods to narrow their bandgap [12, 13]. Besides, the interaction of light with FEs is envisaged to lead to new, yet undiscovered phenomena and applications [14].…”

Section: Introductionmentioning

confidence: 99%

Concurrent bandgap narrowing and polarization enhancement in epitaxial ferroelectric nanofilms

Tyunina

Yao

Chvostová

et al. 2015

Science and Technology of Advanced Materials

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Perovskite-type ferroelectric (FE) crystals are wide bandgap materials with technologically valuable optical and photoelectric properties. Here, versatile engineering of electronic transitions is demonstrated in FE nanofilms of KTaO3, KNbO3 (KNO), and NaNbO3 (NNO) with a thickness of 10–30 unit cells. Control of the bandgap is achieved using heteroepitaxial growth of new structural phases on SrTiO3 (001) substrates. Compared to bulk crystals, anomalous bandgap narrowing is obtained in the FE state of KNO and NNO films. This effect opposes polarization-induced bandgap widening, which is typically found for FE materials. Transmission electron microscopy and spectroscopic ellipsometry measurements indicate that the formation of higher-symmetry structural phases of KNO and NNO produces the desirable red shift of the absorption spectrum towards visible light, while simultaneously stabilizing robust FE order. Tuning of optical properties in FE films is of interest for nanoscale photonic and optoelectronic devices.

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“…Many ferroelectric materials with relatively high Curie temperature have been demonstrated; these materials can be used in solar cells because they can retain their ferroelectric properties even at practically high temperatures associated with the operation of solar cells. Significant research has been performed on the photovoltaic characteristics of BTO [20,21], lead zirconate titanate (PbZrxTi1−xO3, PZT) [22][23][24], bismuth titanate (Bi4Ti3O12) [25], potassium sodium niobate (K0.5Na0.5NbO3, KNN) [26,27], and BFO [21,28,29].…”

Section: Advances and Open Issuesmentioning

confidence: 99%

Applications of ferroelectrics in photovoltaic devices

et al. 2016

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Ferroelectric materials exhibiting anomalous photovoltaic properties are one of the foci of photovoltaic research. We review the foundations and recent progress in ferroelectric materials for photovoltaic applications, including the physics of ferroelectricity, nature of ferroelectric thin films, characteristics and underlying mechanism of the ferroelectric photovoltaic effect, solar cells based on ferroelectric materials, and other related topics. These findings have important implications for improving the efficiency of photovoltaic cells.

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Enhancement of Photocurrent in Ferroelectric Films Via the Incorporation of Narrow Bandgap Nanoparticles

Cited by 117 publications

References 31 publications

New high Tc multiferroics KBiFe2O5 with narrow band gap and promising photovoltaic effect

New high Tc multiferroics KBiFe2O5 with narrow band gap and promising photovoltaic effect

Concurrent bandgap narrowing and polarization enhancement in epitaxial ferroelectric nanofilms

Applications of ferroelectrics in photovoltaic devices

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