Characterization and Photovoltaic Properties of BiFeO3 Thin Films

Shirahata, Yasuhiro; Oku, Takeo

doi:10.3390/coatings6040068

Cited by 19 publications

(6 citation statements)

References 41 publications

(46 reference statements)

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“…Clearly, boosting the efficiency in this system is still a challenge and requires further investigation. Future steps to unlock the full potential of the BFCO-based PV device might be achieved through optimizing microstructures (porosity and surface precipitates) of the active material, ,, performing A-site cosubstitution and oxygen annealing to minimize fluctuations of the oxygen stoichiometry, − and performing interface engineering through the incorporation of selective layers − and transparent oxide electrodes to facilitate charge collection and extraction.…”

Section: Resultsmentioning

confidence: 99%

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe_1–xCo_xO₃ Thin Films

et al. 2019

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Ferroelectric perovskite oxides are emerging as a promising photoactive layer for photovoltaic applications because of their very high stability and their alternative ferroelectricity-related mechanism for solar energy conversion that could lead to extraordinarily high efficiencies. One of the biggest challenges so far is to reduce their band gap toward the visible region while simultaneously retaining ferroelectricity. To address these two issues, herein an elemental composition engineering of BiFeO 3 is performed by substituting Fe by Co cations, as a means to tune the characteristics of the transition metal–oxygen bond. We demonstrate by solution processing the formation of epitaxial, pure phase, and stable BiFe 1– x Co x O 3 thin films for x ≤ 0.3 and film thickness up to 100 nm. Importantly, the band gap can be tuned from 2.7 to 2.3 eV upon cobalt substitution while simultaneously enhancing ferroelectricity. As a proof of concept, nonoptimized vertical devices have been fabricated and, reassuringly, the electrical photoresponse in the visible region of the Co-substituted phase is improved with respect to the unsubstituted oxide.

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Section: Resultsmentioning

confidence: 99%

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe_1–xCo_xO₃ Thin Films

et al. 2019

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“…Here a and c are the bulk lattice constants of BFO, a and c are lattice constants of BFO in thin film state. It was reported in Reference [41] that the σ for the c-axis changed sign for the films grown using the spin coating method, which meant that the film changed from being under compressive strain to being partially tensile strained after a particular concentration. Few known methods of methods of synthesis of BFO thin films are summarized in Table 3, along with their advantages and disadvantages.…”

Section: Strain-induced Me Couplingmentioning

confidence: 99%

Magnetoelectric Coupling in Bismuth Ferrite—Challenges and Perspectives

2020

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Multiferroic materials belong to the sub-group of ferroics possessing two or more ferroic orders in the same phase. Aizu first coined the term multiferroics in 1969. Of late, several multiferroic materials’ unique and robust characteristics have shown great potential for various applications. Notably, the coexisting magnetic and electrical ordering results in the Magnetoelectric effect (ME), wherein the electrical polarization can be manipulated by magnetic fields and magnetization by electric fields. Currently, more significant interests lie in significantly enhancing the ME coupling facilitating the realization of Spintronic devices, which makes use of the transport phenomenon of spin-polarized electrons. On the other hand, the magnetoelectric coupling is also pivotal in magnetic memory devices wherein the application of small electric voltage manipulates the magnetic properties of the device. This review gives a brief overview of magnetoelectric coupling in Bismuth ferrite and approaches to achieve higher magnetoelectric coupling and device applications.

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“…Data hasil pengujian ini berupa sudut difraksi (2Ɵ) dan intensitas. Data hasil XRD kemudian digunakan untuk menghitung ukuran kristal (D) menggunakan persamaan Scherrer sebagai berikut [8] : Spektrofotometer UV-Vis digunakan untuk mengukur besar absorbansi dan transmitansi suatu material serta mengukur energi gap antara pita konduksi dan pita valensi. Penentuan energi gap menggunakan metode Tauc-Plot yaitu dengan cara menarik garis linear dari grafik hubungan ( ℎ ) 2 terhadap ℎ hingga memotong sumbu x. Persamaan Tauc-Plot dapat ditulis sebagai berikut [9] :…”

Section: Metodeunclassified

Pengaruh Suhu Annealing terhadap Struktur Mikro dan Sifat Optik Lapisan Bismuth Ferrite (BiFeO3)

Iriani

Megasari

Nurosyid

2019

Indonesian J Appl Phys

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This study aims to determine the effect of annealing temperature on the microstructure and optical properties of Bismuth Ferrite (BiFeO3) layers. BiFeO3 film was successfully deposited on a quartz substrate using the Chemical Solution Deposition (CSD) method. The microstructure was characterized by XRD and optical properties was characterized with UV-Vis spectrophotometer. The annealing temperature variations are 550 o C, 600 o C, and 650 o C. Annealing temperature affect the microstructure i.e., crystallite size, crystallinity, lattice parameters and optical properties i.e., absorbance and energy gap. The crystallite size, crystallinity, and lattice parameters increase with increased annealing temperature. The peak of absorbance has decreased with the increase in annealing temperature. The lowest energy gap is at 650 o C annealing temperature which is (2,45 ± 0,02) eV.

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Characterization and Photovoltaic Properties of BiFeO3 Thin Films

Cited by 19 publications

References 41 publications

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe_1–xCo_xO₃ Thin Films

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe_1–xCo_xO₃ Thin Films

Magnetoelectric Coupling in Bismuth Ferrite—Challenges and Perspectives

Pengaruh Suhu Annealing terhadap Struktur Mikro dan Sifat Optik Lapisan Bismuth Ferrite (BiFeO3)

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Characterization and Photovoltaic Properties of BiFeO3 Thin Films

Cited by 19 publications

References 41 publications

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe1–xCoxO3 Thin Films

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe1–xCoxO3 Thin Films

Magnetoelectric Coupling in Bismuth Ferrite—Challenges and Perspectives

Pengaruh Suhu Annealing terhadap Struktur Mikro dan Sifat Optik Lapisan Bismuth Ferrite (BiFeO3)

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Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe_1–xCo_xO₃ Thin Films

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe_1–xCo_xO₃ Thin Films