Article
Nanoscience & Nanotechnology
Yang Chen, Haoming Wei, Mingxu Wang, Bingqiang Cao
Summary: The study investigated the role of domain walls (DW) on the bulk photovoltaic effect (BPV) in BiFeO3 (BFO) films by controlling the epitaxial orientation of the film. It was found that the DW enhanced the transport of photogenerated carriers, improving conductivity and power conversion efficiency (PCE). This correlation between DW and BPV effect in BFO film provides a new pathway to enhance the performance of BFO-based photovoltaic devices.
Article
Physics, Condensed Matter
Haoming Wei, Mingxu Wang, Yangqing Wu, Bingqiang Cao
Summary: The effect of substrate on the domain structure and bulk photovoltaic property in BiFeO3 films is reported. It is observed that BiFeO3 films can be epitaxially grown on TbScO3 substrate with a 45 degrees rotation domain. Compared with LaAlO3 substrate, the TbScO3 substrate promotes the formation of periodic 71 degrees ferroelectric domain wall in BiFeO3 films, as demonstrated by piezoelectric force microscopy measurements. Illumination of the BiFeO3 film on TbScO3 substrate by 1 sun AM 1.5 G results in a higher open-circuit voltage of 9.66 V, exceeding the band gap of BiFeO3. These findings contribute to a better understanding of the relationship between domain structure and bulk photovoltaic properties in BiFeO3 films.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Nanoscience & Nanotechnology
Yooun Heo, Hangbo Zhang, Marin Alexe
Summary: Piezoelectricity, an electromechanical effect induced by conversion between mechanical and electrical energy, is a key functionality in ferroelectric oxides. This study reveals a critical pathway for light-induced piezoelectricity enhancement and its dynamic control in a BiFeO3/DyScO3 thin film. By implementing an in-plane geometry operation, the bulk photovoltaic effect can be modulated, leading to a significant increase in the effective piezoelectric coefficient. The study also shows the sinusoidal behavior of piezoelectricity closely linked to photocurrent variations and the persistent behavior of enhanced piezoelectricity after removal of illumination. These findings pave the way for light-induced piezoelectricity enhancement compatible with the photovoltaic effect in ferroelectric thin films for multifunctional nano-optoelectronics.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Miaomiao Zhang, Laijun Liu, Rusen Yang, Ping Yu, Qi Zhang, Biaolin Peng
Summary: In this study, BFO-La codoped PZT epitaxial thin films were prepared by a sol-gel method on different substrates, and large positive EC effects were achieved over a wide temperature range. The thin film deposited on the (111) oriented substrate exhibited a stronger EC effect near room temperature, while the thin films deposited on the (100) and (110) oriented substrates exhibited stronger EC effects around the peak of the dielectric permittivity.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Jiaqi Ding, Ruiqi Guo, Jingcong Hu, Guoqiang Xi, Yue Lu, Jianjun Tian, Linxing Zhang
Summary: This study demonstrates the use of chemical regulation to improve the ferroelectric photovoltaic properties by reducing the bandgap and enhancing lattice distortion. Cobalt substitution is used to introduce chemical strain and enhance the tetragonality of the epitaxial films. The research reveals the potential application of chemical-strain-modulated epitaxial films in optoelectronics and information storage.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Yooun Heo, Marin Alexe
Summary: Enhancing the piezoelectric property of BiFeO3 single crystals using light as a control parameter can result in a locally enhanced effective piezoelectric coefficient, d(zz), showing almost a sevenfold increase. This phenomenon is explained with theoretical models involving the bulk photovoltaic effect and Schottky barrier effect, and the role of open-circuit voltage and photocharge carrier density. These results offer key insights into light-induced piezoelectricity enhancement for potential multifunctional optoelectronic devices.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Lu Yin, Chuanbin Wang, Qiang Shen
Summary: In this study, high-quality LSMZO thin films were successfully prepared by magnetron sputtering, and the effect of Zn doping on the structural, transport, and magnetic properties of the films was systematically investigated. It was found that Zn doping at the Mn site can regulate the intrinsic physical properties of manganite films by modifying double exchange and electron-lattice interaction. Additionally, Zn doping induced an enhancement in the intrinsic magnetoresistance due to the enhanced magnetic disorder.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Hui Tang, Yong-Cai Hu, Xian-Yi Chen, Xiao-Dong Jian, Xiao-Bo Zhao, Ying-Bang Yao, Tao Tao, Bo Liang, Xin-Gui Tang, Sheng-Guo Lu
Summary: This study demonstrates the use of BZNO doping to enhance the energy storage density and efficiency of ceramic capacitors.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Ruijian Zhu, Yaning Shen, Xinyi Wu, Jiaqi Liu, Xueru Shi, Yuxing Ding, Yuan Cong, Zengmei Wang, Hideo Kimura, Zhenxiang Cheng
Summary: High quality epitaxial BiFeO3 films were grown on SrTiO3 substrate using hydrothermal and microwave-assisted hydrothermal methods, with enhanced remanent polarization and magnetization. The films exhibited a clear light response and the microwave-assisted hydrothermal grown film showed an open-circuit voltage exceeding the band gap of BiFeO3 due to the ferroelectric photovoltaic effect. These methods provide a simple, inexpensive, and rapid way to grow high quality BiFeO3 films with potential applications in photoelectric detection and photovoltaic.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Dingshuai Feng, Biaohong Huang, Lingli Li, Xiaoqi Li, Youdi Gu, Weijin Hu, Zhidong Zhang
Summary: In this study, the effects of Eu3+ doping content on the properties of BiFeO3 (BFO) films were investigated. It was found that moderate Eu3+ doping can enhance the photovoltaic effect of BFO thin film devices.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Seiji Nakashima, Ren Kato, Hironori Fujisawa
Summary: This study demonstrated an enhancement of the external quantum efficiency associated with the bulk photovoltaic effect in indium tin oxide/Mn-doped BiFeO3/SrRuO3 capacitors due to the ballistic conduction of hot carriers in response to a 405 nm blue-violet laser. Films of BFMO with thicknesses less than 100 nm showed an abnormal trend in the impact on short circuit current.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Bohong Chang, Bo Li, Zhongxiao Wang, Hui Li, Lian Wang, Lu Pan, Zihao Li, Longwei Yin
Summary: A novel bulk defect suppression strategy is proposed by introducing large organic piperazine cations into the lattice of 3D FASnI(3) perovskite to restrain the generation of bulk defects, enhancing device performance of Sn-based perovskite solar cells.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
Y. M. Wang, X. G. Zhang, H. Y. Zeng, S. Y. Ji, X. Y. Fan, H. Y. Li, Y. L. Yin, Z. R. Yi, G. Li, J. M. Song
Summary: This study successfully fabricated a Pt/BFO/LSCO heterostructure ferroelectric capacitor and found that the BFO film exhibited remarkable ferroelectric photovoltaic performance, with a faster photovoltaic response at 80℃.
MODERN PHYSICS LETTERS B
(2023)
Article
Materials Science, Ceramics
Arvind Kumar, Ashwani Kumar, Shekhar Tyagi, Ramesh Chandra, Davinder Kaur
Summary: This study investigates the in-situ growth of nanoflakes structure in Bi0.9La0.1Fe0.5Mn0.5O3 (BLFMO) thin films. The study demonstrates that the use of a LNO buffer layer allows for controlled growth of BLFMO thin films with a specific crystal structure. The compact and densely packed nanoflake structures in the BLFMO thin film samples are confirmed by surface morphological investigations. The study also explores the leakage current behavior and tunability of BLFMO thin films, presenting valuable insights for the fabrication of thin film based ferroelectric memory devices.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Nan Liu, Yi Cao, Yun-Long Tang, Yin-Lian Zhu, Yu-Jia Wang, Jia-Qi Liu, Heng Zhang, Chang-Ji Li, Si-Rui Zhang, Bing Yang, Hai-Ning Li, Xiu-Liang Ma
Summary: Engineering regular crystallographic facet arrays on a large scale is useful for optimizing photophysical properties of optoelectronic materials. In this study, textured BLFO film surfaces with nanosquare arrays composed of {001} and {110} crystallographic facets were achieved using a thermal etching method. The faceted samples exhibited significantly enhanced photocurrent signals, and the {110} surface showed highly dispersive electronic structure, indicating better carrier transport.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Ryuki Tsuji, Yuuki Koshino, Hideaki Masutani, Yuichi Haruyama, Masahito Niibe, Satoru Suzuki, Seiji Nakashima, Hironori Fujisawa, Seigo Ito
Article
Physics, Applied
Tsubasa Migita, Masafumi Kobune, Ryoga Ito, Taiki Obayashi, Hideyuki Takasaki, Ryo Ito, Takeyuki Kikuchi, Hironori Fujisawa, Kensuke Kanda, Kazusuke Maenaka, Yamato Hayashi
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Satoru Suzuki, Yuichi Haruyama, Akinobu Yamaguchi, Tomoki Yamamoto, Takuya Yoshizumi, Ayaka Fujii, Seiji Nakashima, Yakumo Fuchiwaki, Hironori Fujisawa, Takuo Ohkochi, Mari Ishihara, Hirosuke Sumida
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Seiji Nakashima, Ren Kato, Hironori Fujisawa
Summary: This study demonstrated an enhancement of the external quantum efficiency associated with the bulk photovoltaic effect in indium tin oxide/Mn-doped BiFeO3/SrRuO3 capacitors due to the ballistic conduction of hot carriers in response to a 405 nm blue-violet laser. Films of BFMO with thicknesses less than 100 nm showed an abnormal trend in the impact on short circuit current.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Hironori Fujisawa, Kazuma Ikeda, Seiji Nakashima
Summary: By fabricating vertical ferroelectric gate-all-around nanowire transistors, the study successfully demonstrates their strong potential in high-density ferroelectric memory applications and nonvolatile electric field effect.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Tsubasa Migita, Masafumi Kobune, Kengo Matsumoto, Yuuri Takeuchi, Hironori Fujisawa, Kensuke Kanda, Kazusuke Maenaka
Summary: Microplate (MP) and microrod (MR)-type CoFe2O4/(Bi3.25Nd0.65Eu0.10)Ti3O12 composite thin films were fabricated using a combination of reactive ion etching and metalorganic chemical vapor deposition. The optimal post-annealing temperature of 700 degrees C was found to improve the magnetoelectric (ME) properties, with MR shape showing a greater ME effect compared to MP shape. The electrical insulation properties of the films improved with increasing post-annealing temperature, while high-temperature caused degradation in magnetic and ferroelectric properties.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Seiji Nakashima, Tatsuya Ito, Takuo Ohkochi, Hironori Fujisawa
Summary: Ferroelectric semiconductors have garnered interest for potential applications in novel electronic and opto-electric devices, with band modulation based on spontaneous polarization generating polarization charges at metal/ferroelectric and ferroelectric/ferroelectric interfaces. The study evaluated band modulation at the graphene/BFMO interface by fabricating capacitor structures with BFMO of specific polarization directions and analyzing chemical shifts in XPS spectra. Positive (negative) polarization charges were found to act as quasi-dopants for electron (hole) doping of BFMO and graphene.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Kazuki Arima, Seiji Nakashima, Koji Kimura, Koichi Hayashi, Naohisa Happo, Hironori Fujisawa
Summary: This study investigates the local atomic structure around the Fe site in a V-doped BFO thin film using X-ray fluorescence holography. The results reveal that the atomic structure stability of the V-doped BFO thin film differs from that of previously reported Mn-doped BFO thin films, providing important insights into the mechanism of controlling the conductivity of BFO thin films by dopants.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Takeshi Asuka, Junpei Ouchi, Hironori Fujisawa, Seiji Nakashima
Summary: HZO films prepared via non-heating sputtering are investigated for their application in ferroelectric-gate TFTs. The internal tensile stress induced by ITO top-electrode deposition is found to promote the crystallization of HZO from the amorphous state to the ferroelectric phase. Non-heating process fabricated ITO/HZO/ITO capacitors exhibit ferroelectric hysteresis loops with remanent polarizations of 6-9 μC cm(-2) and coercive fields of 0.6-1.1 MV cm(-1). Non-heating process fabricated ferroelectric-gate TFTs with a 10 nm thick ITO channel show nonvolatile operation with an on/off ratio of ~10.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Ramon Arcas, Yuuki Koshino, Elena Mas-Marza, Ryuki Tsuji, Hideaki Masutani, Eri Miura-Fujiwara, Yuichi Haruyama, Seiji Nakashima, Seigo Ito, Francisco Fabregat-Santiago
Summary: A low-cost procedure has been developed for the preparation of earth-abundant Ni, Fe and NiFe decorated electrodes, showing reasonable performance in the OER. Detailed analysis of impedance spectroscopy successfully links the redox transitions of Ni with the electrochemical redox capacitance response, demonstrating the utility of impedance spectroscopy for studying electrochemical systems under operating conditions.
SUSTAINABLE ENERGY & FUELS
(2021)
