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"Design of oxygen vacancy in BiFeO3-based films for higher photovoltaic" by Tiantian Yang, Jie Wei et al.

Photovoltaic technology has been a research hotspot in the field of renewable and clean solar energy. More recently, the ferroelectric photovoltaic effect (FEPV) of BiFeO3 has attracted much attention, since it could obtain a giant open-circuit voltage (VOC) far beyond its bandgap and possibly break through the energy conversion limit of traditional solar cells. However, there has been controversy about the origin and the mechanism of FEPV in BiFeO3. In this work, (Pr, Ni) co-doped BiFeO3 film photovoltaic devices were well constructed and the intrinsic mechanism of the photovoltaic effect was comprehensively investigated. The results and analysis suggested that oxygen vacancies play significant roles on the photovoltaic effect of BiFeO3. Oxygen vacancies not only introduce impurity band as an intermediate band among the band gap of ferroelectric semiconductor to enhance the photocurrent, but also restructure the energy band of Schottky barrier at the interfaces through their electromi ....

Bismuth Ferrite , Xygen Vacancy , Photovoltaic Effect , Witchable Photovoltaic ,

"Integrating Band Engineering and the Flexoelectric Effect Induced by a" by Zehao Sun, Jie Wei et al.

Photovoltaic energy as one of the important alternatives to traditional fossil fuels has always been a research hot spot in the field of renewable and clean solar energy. Very recently, the anomalous ferroelectric photovoltaic effect in multiferroic bismuth ferrite (BiFeO3) has attracted much attention due to the above-bandgap photovoltage and switchable photocurrent. However, its photocurrent density mostly in the magnitudes of μA/cm2 resulted in a poor power conversion efficiency, which severely hampered its practical application as a photovoltaic device. In this case, a novel approach was designed to improve the photocurrent density of BiFeO3 through the cooperative effect of the gradient distribution of oxygen vacancies and consequently induced the flexoelectric effect realized in the (La, Co) gradient-doped BiFeO3 multilayers. Subsequent results and analysis indicated that the photocurrent density of the gradient-doped multilayer BiFeO3 sample was nearly 3 times as much as that o ....

Band Engineering , Bismuth Ferrite , Lexoelectric Effect , Xygen Vacancy , Photovoltaic Effect ,

Superlattice Electromechanical Characterization with Piezo-Response Force Microscopy

Sponsored by Park SystemsApr 29 2021
It is possible to generate long-range wavelength ordering known as Moiré superlattice periodicity by stacking two-dimensional (2D) materials within each other’s van der Waals interaction distance.
When this process is applied to graphene on hexagonal boron nitride (hBN), this effect would appear on the uppermost layer of graphene, causing graphene’s energy bandgap to open.
1,2,3
Regulating lattice orientation between graphene and boron nitride can facilitate variation in the Moiré periodicity s wavelength, effectively tuning the graphene energy bandgap. The energy bandgap range will, in turn, affect graphene’s performance and device functionalities.
4
Researchers will therefore benefit from a simple means of deciphering Moiré shape and periodicity, particularly when designing 2D graphene/BN-like heterostructured devices and materials. ....

John Paul Pineda , Jiali Zhang , Ben Schoenek , Europe Gmb , Byong Kim , Atomic Force Microscopy , Dae Yoen Won Research Development , Armando Melgarejo Research Technical Services , Park Systems Inc , Qiong Ma Department Of Physics , Boston College , Park Systems Corp , Park Systemsapr , Force Microscopy , Hexagonal Boron , Zurich Instruments , Bismuth Ferrite , Double Frequency Resonance Tracking , Image Credit , Spark Systems , Bilayer Graphene , Scientific Reports , Nature Physics , Microscopy Today , Armando Melgarejo , Research Technical Services ,

Dual Frequency Resonance Tracking: Stabilizing the Piezoresponse

Sponsored by Park SystemsJan 21 2021
Ferroelectrics found extensive uses in industrial applications because of their unparalleled electromechanical and electrical characteristics, for example, as actuators, sensors and capacitors [1], [2].
The suitability of ferroelectrics for modern communication technology is currently investigated by researchers, including 5G [3] and as active layers in photovoltaics [4, 5] among other applications [6].
Ferroelectricity is the consequence of an alteration in crystal symmetry during a phase transition. A sudden electrical polarization is introduced by an off-centering of the center ion or tilting of ionic groups. The crystal forms domains of parallelly aligned polarization in order to reduce the electrostatic energy.
Without an external electric field, these domains are randomly oriented so that the macroscopic electrical polarization of the crystal stays fixed at zero (Figure 1a). ....

Aakash Bhatnagar , A Roy Chaudhuri , Atomic Force Microscope , Atomic Force Microscopy , Piezoelectric Force Microscopy , Energy Environ , Centre For Innovation Competence Sili Nano , Park Systemsjan , Image Credit , Dual Frequency Resonance Tracking , Spark Systems , Zurich Instruments , Park System Smartscan , Zurich Instrument , Bismuth Ferrite , Force Microscope , Innovation Competence , Modern Ferroelectrics , Strain Controlled Ferroelastic Domain Evolution , அணு படை நுண்ணோக்கி , ஆற்றல் சூழல் , மையம் க்கு கண்டுபிடிப்பு திறன் சிலி நானோ , படம் கடன் , இரட்டை அதிர்வெண் அதிர்வு கண்காணிப்பு , பூங்கா அமைப்புகள் , ஸுரி கருவிகள் ,