Photovoltaic Properties of Multiferroic BiFeO<sub>3</sub>/BiCrO<sub>3</sub> Heterostructures

Chakrabartty, Joyprokash; Nechache, Riad; Li, Shun; Nicklaus, Mischa; Ruediger, A.; Rosei, Federico

doi:10.1111/jace.12837

Cited by 40 publications

(12 citation statements)

References 28 publications

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“…In a similar fashion, in BiFeO 3 /BiCrO 3 bilayers, a high photovoltaic current of 130 μA cm −2 has been recorded for 15 nm thick layers, twice as much as the photovoltaic current measured in 40 nm thick layers. [74] …”

Section: Size Effects: the Smaller The Better?mentioning

confidence: 99%

“…It is worth mentioning that in addition to the PCE, the fill factor (FF) i.e., the maximum power in the current-voltage curve divided by the product of the short-circuit photovoltaic current and the open-circuit photovoltage is an important parameter as it characterizes the quality of the solar cell. Only few papers on photoferroelectrics [13,74] have reported FF data and showed rather weak values of about 10-30% while in classical semiconductors it reaches typically up to 80%. Low FF values are usually attributed to resistive losses via for instance electrodes contact or defects.…”

Section: Introductionmentioning

confidence: 99%

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Photovoltaics with Ferroelectrics: Current Status and Beyond

et al. 2016

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Ferroelectrics carry a switchable spontaneous electric polarization. This polarization is usually coupled to strain, making ferroelectrics good piezoelectrics. When coupled to magnetism, they become so-called multiferroic systems, a field that has been widely investigated since 2003. While ferroelectrics are birefringent and non-linear optically transparent materials, the coupling of polarization with optical properties has received, since 2009, renewed attention, triggered notably by low-bandgap ferroelectrics suitable for sunlight spectrum absorption and original photovoltaic effects. Consequently, power conversion efficiencies up to 8.1% were recently achieved and values of 19.5% were predicted, making photoferroelectrics promising photovoltaic alternatives. This article aims at providing an up-to-date review on this emerging and rapidly progressing field by highlighting several important issues and parameters, such as the role of domain walls, ways to tune the bandgap, consequences arising from the polarization switchability, and the role of defects and contact electrodes, as well as the downscaling effects. Beyond photovoltaicity, other polarization-related processes are also described, like light-induced deformation (photostriction) or light-assisted chemical reaction (photostriction). It is hoped that this overview will encourage further avenues to be explored and challenged and, as a byproduct, will inspire other research communities in material science, e.g., so-called hybrid halide perovskites.

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Section: Size Effects: the Smaller The Better?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photovoltaics with Ferroelectrics: Current Status and Beyond

et al. 2016

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“…FEs can even yield an above band gap photovoltage that clearly distinguishes them from conventional semiconductors, referred to as anomalous photovoltage [11]. However, the direction of photocurrent can be switched by reversing the polarization direction, which indicates its contribution to PV effects [12]. The typical generation of photocurrent is of the order of few nA cm -2 [2].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photovoltaic properties in bilayer BiFeO₃/Bi-Mn-O thin films

et al. 2016

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We report an external solar power conversion efficiency of ∼1.43% in BiFeO3(BFO)/BiMnO3(BMO) bilayer thin films. Both films are epitaxially grown on (111) oriented niobium doped SrTiO3 (NSTO) single crystal substrates by pulsed laser deposition. By illuminating the BFO/BMO films under 1 Sun (AM 1.5 G), we found a remarkably high fill factor of ∼0.72, much higher than values reported for devices based on BFO or BMO alone. In addition, we demonstrate that the photocurrent density and photovoltage are tunable by changing the polarization direction in the BFO/BMO bilayer, as confirmed by the macroscopic polarization-voltage (P-V) hysteresis loop. This effect is described in terms of a more favorable energy band alignment of the electrode/bilayer/NSTO heterostructure junction, which controls photocarrier separation.

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“…Since light absorption and carrier concentrations are both band-gap dependent, the red-shift of the absorption edge of BFCO with respect to BCO and BFO and the increase of the spectral weight around 1.55 and 2.14 eV will increase the power conversion efficiencies (PCE) recently reported in such oxide materials (typically between 0.1 and 0.3%). [29][30][31] We studied the PV properties of BFCO thin films integrated on a Si substrate under 1.5 AM Sunlight, corresponding to an incident power density of 100 mW cm −2 . Device characterization was carried out in an ambient environment.…”

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confidence: 99%

Photovoltaic properties of Bi₂FeCrO₆films epitaxially grown on (100)-oriented silicon substrates

Nechache

Huang

et al. 2016

Nanoscale

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We demonstrate the promising potential of using perovskite Bi2FeCrO6 (BFCO) for niche applications in photovoltaics (PV) (e.g. self-powered sensors that simultaneously exploit PV conversion and multiferroic properties) or as a complement to mature PV technologies like silicon. BFCO thin films were epitaxially grown on silicon substrates using an MgO buffer layer. Piezoresponse force microscopy measurements revealed that the tensile strained BFCO phase exhibits a polarization predominantly oriented through the in-plane direction. The semiconducting bandgap of the ordered BFCO phase combined with ferroelectric properties, opens the possibility of a ferroelectric PV efficiency above 2% in a thin film device and the use of ferroelectric materials simultaneously as solar absorber layers and carrier separators in PV devices. A large short circuit photocurrent density of 13.8 mA cm(-2) and a photovoltage output of 0.5 V are typically obtained at FF of 38% for BFCO devices fabricated on silicon. We believe that the reduced photovoltage is due to the low diffusion length of photogenerated charge carriers in the BFCO material where the ferroelectric domains are predominately oriented in-plane and thus do not contribute efficiently to the photocharge separation process.

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Photovoltaic Properties of Multiferroic BiFeO₃/BiCrO₃ Heterostructures

Cited by 40 publications

References 28 publications

Photovoltaics with Ferroelectrics: Current Status and Beyond

Photovoltaics with Ferroelectrics: Current Status and Beyond

Enhanced photovoltaic properties in bilayer BiFeO₃/Bi-Mn-O thin films

Photovoltaic properties of Bi₂FeCrO₆films epitaxially grown on (100)-oriented silicon substrates

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Photovoltaic Properties of Multiferroic BiFeO3/BiCrO3 Heterostructures

Cited by 40 publications

References 28 publications

Photovoltaics with Ferroelectrics: Current Status and Beyond

Photovoltaics with Ferroelectrics: Current Status and Beyond

Enhanced photovoltaic properties in bilayer BiFeO3/Bi-Mn-O thin films

Photovoltaic properties of Bi2FeCrO6films epitaxially grown on (100)-oriented silicon substrates

Contact Info

Product

Resources

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Photovoltaic Properties of Multiferroic BiFeO₃/BiCrO₃ Heterostructures

Enhanced photovoltaic properties in bilayer BiFeO₃/Bi-Mn-O thin films

Photovoltaic properties of Bi₂FeCrO₆films epitaxially grown on (100)-oriented silicon substrates