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Doğan, Aydın; Prasadarao, A. V.; Uchino, Kenji; Poosanaas, Patcharin; Komarneni, Sridhar

doi:10.1023/a:1009906600737

Cited by 29 publications

(11 citation statements)

References 8 publications

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“…24,59,89,90 It is known that changing the chemical composition of ferroelectric materials can signicantly change their crystal structures and thus the degree of noncentrosymmetry, which can affect the photovoltaic response. [91][92][93] For example, in the PZT ceramics, when the Zr/Ti atomic ratio varies from 48/53 to 54/46, the crystal structure changes from tetragonal to rhombohedral, where the latter shows stronger crystallographic asymmetry. Therefore in the lanthanum-doped PZT (PLZT) ceramics, the photocurrent was observed to increase by six times when the dopant loading was reduced from 6% to 4%.…”

Section: Exciton Dissociation Efficiencymentioning

confidence: 99%

Arising applications of ferroelectric materials in photovoltaic devices

et al. 2014

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The ferroelectric-photovoltaic (FE-PV) device, in which a homogeneous ferroelectric material is used as a light absorbing layer, has been investigated during the past several decades with numerous ferroelectric oxides. The FE-PV effect is distinctly different from the typical photovoltaic (PV) effect in semiconductor p-n junctions in that the polarization electric field is the driving force for the photocurrent in FE-PV devices. In addition, the anomalous photovoltaic effect, in which the voltage output along the polarization direction can be significantly larger than the bandgap of the ferroelectric materials, has been frequently observed in FE-PV devices. However, a big challenge faced by the FE-PV devices is the very low photocurrent output. The research interest in FE-PV devices has been re-spurred by the recent discovery of above-bandgap photovoltage in materials with ferroelectric domain walls, electric switchable diodes and photovoltaic effects, tip-enhanced photovoltaic effects at the nanoscale, and new low-bandgap ferroelectric materials and device design. In this feature article, we reviewed the advance in understanding the mechanisms of the ferroelectric photovoltaic effects and recent progress in improving the photovoltaic device performance, including the emerging approaches of integrating the ferroelectric materials into organic heterojunction photovoltaic devices for very high efficiency PV devices.

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Section: Exciton Dissociation Efficiencymentioning

confidence: 99%

Arising applications of ferroelectric materials in photovoltaic devices

et al. 2014

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confidence: 99%

“…Although the response time increases with increasing wavelength, it still remains much smaller than reported values for best-known PLZT photostrictive ferroelectric ceramics. 4 The response time due to illumination of white light is 1.7 s, which corresponds to an average of the response times for all discrete wavelengths measurements, ranging from 1.1 s to 2.7 s. The light with smaller light energy (530 nm) causes faster deformation than irradiance with larger energy (450 nm). This is in agreement with expected faster momentum transfer for energies closer to the bandgap of the material, where the photovoltaic effect can be large.…”

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confidence: 99%

Wavelength dependence of photoinduced deformation in BiFeO3

et al. 2012

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Optomechanical effects in polar solids result from the combination of two main processes, electric field-induced strain and photon-induced voltages. Whereas the former depends on the electrostrictive ability of the sample to convert electric energy into mechanical energy, the latter is caused by the capacity of photons with appropriate energy to generate charges and, therefore, can depend on wavelength. We report here on mechanical deformation of BiFeO 3 and its response time to discrete wavelengths of incident light ranging from 365 to 940 nm. The mechanical response of BiFeO 3 is found to have two maxima in near-UV and green spectral wavelength regions. DOI: 10.1103/PhysRevB.85.092301 PACS number(s): 78.20.hb, 75.85.+t, 78.20.nc Cross-functional materials, where structure, charge, and magnetism are strongly interrelated, present high interest opportunities to realize new functionalities. In particular, photoelasticity in electrically polar materials is an extraordinary property with valuable remote light-controlled applications. [1][2][3] Due to the spontaneous polarization in polar dielectrics, light-generated charges distribute along the internal electricfield direction, thus changing the total electric field, and can cause sample deformation via the electrostrictive effect. Although some practical devices have been developed, the best response time with typical values of tens of seconds 4 must be improved. In that respect, our recent report on photoelastic effect in BiFeO 3 (BFO) with a fast response time may boost this research direction.5 Moreover, the observed magnetic field dependence can offer additional functionality in future photoelastic-multiferroic devices where strain, magnetization, and polarization can potentially be changed simultaneously by light as well as applied magnetic and electric fields. The BFO is a well-documented magnetic and ferroelectric compound in which both properties have been investigated rather extensively.6 Very interesting recent reports on optical properties in BFO include magnetochromism 7 and photovoltaic effects. 8,9 In this Brief Report, we investigate the wavelength dependence of the photoinduced strain in BFO single crystal for the purpose of finding an optimal cross-operational energy window of this intriguing property. Such measurements can also provide an independent indirect insight into the optical sensitivity of this extraordinary room temperature multiferroic compound.A BFO single crystal with thickness of 90 μm and lateral dimensions in the mm scale, shown on Fig. 1, was used for this study. The sample was selected using polarized light with an optical microscope revealing its single ferroelectric domain state with its spontaneous ferroelectric polarization along the [111] direction in the pseudocubic lattice description.Side 1 of the crystal is flat and reflective, allowing an easy verification of the sample ferroelectric state by polarized light in reflection mode, while side 2 exhibits a significant light absorption and indicates directions of crystal...

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“…Therefore, it becomes important to increase the non‐centrosymmetry in ferroelectrics . The idea of enhancing the photocurrent by increasing the non‐centrosymmetry is also supported by experiments . For the final stage of charge collection, a reduction in the ferroelectric film thickness is beneficial, but the photovoltages are decreased .…”

Section: Future Prospectsmentioning

confidence: 93%

Mutual Insight on Ferroelectrics and Hybrid Halide Perovskites: A Platform for Future Multifunctional Energy Conversion

et al. 2019

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An insight into the analogies, state-of-the-art technologies, concepts, and prospects under the umbrella of perovskite materials (both inorganicorganic hybrid halide perovskites and ferroelectric perovskites) for future multifunctional energy conversion and storage devices is provided. Often, these are considered entirely different branches of research; however, considering them simultaneously and holistically can provide several new opportunities. Recent advancements have highlighted the potential of hybrid perovskites for high-efficiency solar cells. The intrinsic polar properties of these materials, including the potential for ferroelectricity, provide additional possibilities for simultaneously exploiting several energy conversion mechanisms such as the piezoelectric, pyroelectric, and thermoelectric effect and electrical energy storage. The presence of these phenomena can support the performance of perovskite solar cells. The energy conversion using these effects (piezo-, pyro-, and thermoelectric effect) can also be enhanced by a change in the light intensity. Thus, there lies a range of possibilities for tuning the structural, electronic, optical, and magnetic properties of perovskites to simultaneously harvest energy using more than one mechanism to realize an improved efficiency. This requires a basic understanding of concepts, mechanisms, corresponding material properties, and the underlying physics involved with these effects. His current research focuses on developing functional inorganic−organic hybrid materials and energy conversion devices including perovskite solar cells.are found to have lower t-values (0.75 < t < 1.0). t-values help in governing and tuning the presence of ferroelectricity in perovskites [11] and are responsible for the transition temperatures in ferroelectrics. [57] In the case of hybrid inorganic-organic perovskites, the A-site and/or X-site ions are replaced by molecular building blocks; hence, the tolerance

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Cited by 29 publications

References 8 publications

Arising applications of ferroelectric materials in photovoltaic devices

Arising applications of ferroelectric materials in photovoltaic devices

Wavelength dependence of photoinduced deformation in BiFeO3

Mutual Insight on Ferroelectrics and Hybrid Halide Perovskites: A Platform for Future Multifunctional Energy Conversion

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