Reply to 'Reconsidering the Shockley–Queisser limit of a ferroelectric insulator device'

Spanier, Jonathan E.; Fridkin, V. M.; Rappe, Andrew M.; Akbashev, Andrew R.; Polemi, A.; Qi, Yubo; Gu, Zhiqi; Young, Steve M.; Hawley, Christopher J.; Imbrenda, Dominic; Xiao, Geoffrey; Bennett-Jackson, Andrew L.; Johnson, Craig

doi:10.1038/nphoton.2017.85

Cited by 9 publications

(15 citation statements)

References 5 publications

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“…Moreover, in the case of ferroelectrics, which are materials with persistent and switchable polarization, the sign and direction of BPE photovoltages and photocurrents may be inverted. Properly engineered, this kind of anomalous photovoltaic effect enables innovative energy conversion applications involving photons [19][20][21]. In practical devices, however, the photo-response should be generated by either the solar spectrum (outdoor natural sunlight) or indoor light (illumination without ultraviolet and infrared components), and therein lies a key issue: ferroelectrics that show above-bandgap photovoltages are generally wide-bandgap materials that only display a BPE response with illumination in the UV or near-UV range.…”

Section: Introductionmentioning

confidence: 99%

Giant bulk photovoltaic effect in solar cell architectures with ultra-wide bandgap Ga2O3 transparent conducting electrodes

Pérez‐Tomás

Chikoidze

Dumont

et al. 2019

Materials Today Energy

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The use of ultra-wide bandgap transparent conducting beta gallium oxide (-Ga 2 O 3) thin films as electrodes in ferroelectric solar cells is reported. In a new material structure for energy applications, we report a solar cell structure (a light absorber sandwiched in between two electrodes-one of them-transparent) which is not constrained by the Shockley-Queisser limit for open-circuit voltage (V oc) under typical indoor light. The solar blindness of the electrode enables a record-breaking bulk photovoltaic effect (BPE) with white light illumination (general use indoor light). This work opens up the perspective of ferroelectric photovoltaics which are not subject to the Shockley-Queisser limit by bringing into scene solar-blind conducting oxides.

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Section: Introductionmentioning

confidence: 99%

Giant bulk photovoltaic effect in solar cell architectures with ultra-wide bandgap Ga2O3 transparent conducting electrodes

Pérez‐Tomás

Chikoidze

Dumont

et al. 2019

Materials Today Energy

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“…[1][2][3][4] In particular, the reported giant photogenerated field (~ 10 4 V/cm) in Fe doped LiNbO3 single crystal and the demonstrated power-conversion efficiency exceeding the Shockley-Queisser limit at nanoscale in BaTiO3 (BTO) thin film, make the ferroelectric systems as the promising candidate for PV studies. 5,6 Several mechanisms are proposed to explain the anomalous ferroelectric PV response. 2,[7][8][9][10][11] Among them, the bulk photovoltaic effect (BPVE), associated with the violation of the detailed balance principle, is a widely accepted mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…2,[7][8][9][10][11] Among them, the bulk photovoltaic effect (BPVE), associated with the violation of the detailed balance principle, is a widely accepted mechanism. 2,6,10,11 The anomalous PV effects in several non-centrosymmetric systems having single and multiple phase co-existence such as BTO, PbTiO3, BiFeO3, KNbO3, (K,Ba)(Ni,Nb)O3-δ, ZnSnP2, etc., are analyzed either through phenomenological approach or by shift current theory. [12][13][14][15][16][17][18] In the phenomenological model, the PV current consists of linear and circular components as expressed by,…”

Section: Introductionmentioning

confidence: 99%

Bulk photovoltaic effect in BaTiO3-based ferroelectric oxides: An experimental and theoretical study

Pal

Muthukrishnan

Sadhukhan

et al. 2021

Journal of Applied Physics

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The bulk photovoltaic effect exhibited by the non-centrosymmetric system gains research interest due to the observed large open-circuit voltage. The ferroelectric systems exhibiting anomalous photovoltaic effect are mostly crystallized with multiphase coexistence. Hence, the computational difficulty in building a multi-phase system restricts the detailed photovoltaic studies through phenomenological and shift current theory. In this work, ferroelectric Ba1x(Bi0.5K0.5)xTiO3 (BBKT) oxide is designed to crystallize in single-phase tetragonal symmetry with improved polarization characteristics, and it is found to exhibits large PV response. Both experimental and theoretical studies on BBKT samples reveal ~18% reduction in bandgap compared to the parent BaTiO3. Short-circuit current measured as a function of light intensity and light polarization angle reveal linear and sinusoidal response, respectively. The observed features are in accordance with phenomenological theory. Remarkably, x = 0.125 sample displays ~8 times higher open-circuit voltage (7.39 V) than the parent compound. The enhanced PV effect is attributed to the large shift current along z-direction as evidenced from the additional charge-center shift of valence band occupied by O-2p orbital and conduction band occupied by Bi-6p orbital. Notably, the degenerate Bi-pz state at conduction band minimum in BBKT favours the large shift current response in the z-direction.

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“…Although visible light is readily harvested by solar cells based on the photovoltaic effect, these devices are limited by equilibrium thermodynamics as reflected in the Shockley-Queisser (SQ) limit. [24,25] A top-down, lithographically defined ratchet acting as an energy harvester was presented by Pan et al who investigated a thermal ratchet consisting of a spiral antenna in series with a self-switching nanodiode reaching a power conversion efficiency of 0.02%. Theoretically it has been shown that ratchets can reach Carnot efficiency, [22] and as they fundamentally operate as nonequilibrium devices, they are not bound by the SQ limit; in a recent paper it was argued that a bottom-up designed ratchet, based on the bulk photovoltaic effect in a ferroelectric material, surpassed the SQ limit.…”

Section: Introductionmentioning

confidence: 99%

“…Theoretically it has been shown that ratchets can reach Carnot efficiency, and as they fundamentally operate as nonequilibrium devices, they are not bound by the SQ limit; in a recent paper it was argued that a bottom‐up designed ratchet, based on the bulk photovoltaic effect in a ferroelectric material, surpassed the SQ limit . Although this work has been disputed, the principle remains valid . A top‐down, lithographically defined ratchet acting as an energy harvester was presented by Pan et al who investigated a thermal ratchet consisting of a spiral antenna in series with a self‐switching nanodiode reaching a power conversion efficiency of 0.02% …”

Section: Introductionmentioning

confidence: 99%

Scalable Electronic Ratchet with Over 10% Rectification Efficiency

et al. 2019

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Electronic ratchets use a periodic potential with broken inversion symmetry to rectify undirected (electromagnetic, EM) forces and can in principle be a complement to conventional diode‐based designs. Unfortunately, ratchet devices reported to date have low or undetermined power conversion efficiencies, hampering applicability. Combining experiments and numerical modeling, field‐effect transistor‐based ratchets are investigated in which the driving signal is coupled into the accumulation layer via interdigitated finger electrodes that are capacitively coupled to the field effect transistor channel region. The output current–voltage curves of these ratchets can have a fill factor >> 0.25 which is highly favorable for the power output. Experimentally, a maximum power conversion efficiency well over 10% at 5 MHz, which is the highest reported value for an electronic ratchet, is determined. Device simulations indicate this number can be increased further by increasing the device asymmetry. A scaling analysis shows that the frequency range of optimal performance can be scaled to the THz regime, and possibly beyond, while adhering to technologically realistic parameters. Concomitantly, the power output density increases from ≈4 W m−2 to ≈1 MW m−2. Hence, this type of ratchet device can rectify high‐frequency EM fields at reasonable efficiencies, potentially paving the way for actual use as energy harvester.

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Reply to 'Reconsidering the Shockley–Queisser limit of a ferroelectric insulator device'

Cited by 9 publications

References 5 publications

Giant bulk photovoltaic effect in solar cell architectures with ultra-wide bandgap Ga2O3 transparent conducting electrodes

Giant bulk photovoltaic effect in solar cell architectures with ultra-wide bandgap Ga2O3 transparent conducting electrodes

Bulk photovoltaic effect in BaTiO3-based ferroelectric oxides: An experimental and theoretical study

Scalable Electronic Ratchet with Over 10% Rectification Efficiency

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