Bandgap narrowing of Ba0.92Na0.04Bi0.04TiO3 ferroelectric ceramics by transition metals doping for photovoltaic applications

Alkathy, Mahmoud S.; Lente, M. H.; Eiras, J. A.

doi:10.1016/j.matchemphys.2020.123791

Cited by 44 publications

(19 citation statements)

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“…Finally, the A 1 (LO 3 ) mode was correlated with octahedral distortion in the ferroelectric phase [39][40][41]. The broadening of the A 1 (TO 3 ) mode after irradiation was due to the overlap of the different modes [42]. Interestingly, most Raman modes shift to lower wavenumbers after gamma irradiation, which could be attributed to the shift of Ti cations or octahedral distortion [43][44][45][46] (see Figure 3 and Table 2).…”

Section: Resultsmentioning

confidence: 99%

Effect of Gamma Irradiation on the Structural, Optical, Electrical, and Ferroelectric Characterizations of Bismuth-Modified Barium Titanate Ceramics

2022

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Materials with ferroelectric properties, low bandgap energies, high polarization, low loss, and thermal stability are essential for future solar-cell applications. Researchers have attempted to obtain such materials by using several approaches. In this vein, a novel approach is reported in this work using gamma ray irradiation. The effect of gamma radiation on the structural, optical, and ferroelectric characterizations of bismuth (Bi)-doped barium titanate (BaTiO3 (BT)), namely Ba0.95Bi0.05TiO3 ceramics (abbreviated as (Bi:BT)), was investigated. X-ray diffraction, structure refinement, and Raman study revealed the presence of a perovskite structure with a tetragonal phase in all investigated samples. Morphological study revealed a nonuniform grain size and some porosity. Gamma irradiation-induced combined effects were proved by a detailed analysis of bond lengths, bond angles, octahedral distortions, oxygen vacancies, and charge compensations. Electron paramagnetic resonance (EPR) study gave direct evidence of oxygen vacancies in the irradiated samples. After gamma irradiation, UV–vis study indicated a decrease in the bandgap from 3.14 to 2.80 eV and a significant increase in visible light absorption. Cole–Cole plots confirm as an increase in gamma-ray dose results in higher levels of electron hopping. Study of the P–E hysteresis loop demonstrated that ferroelectric properties could be maintained after gamma irradiation, with a slight decrease in remnant polarization. The behaviour of the P–E was correlated with increasing gamma dose in the investigated ceramics, demonstrating a strong gamma dependence in the loops’ profile. We guess that the present approach may be a promising technique for enhancing the multifunctionality of electronic devices.

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Section: Resultsmentioning

confidence: 99%

Effect of Gamma Irradiation on the Structural, Optical, Electrical, and Ferroelectric Characterizations of Bismuth-Modified Barium Titanate Ceramics

2022

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“…In the field of photovoltaics, narrow bandgap (less than 3 eV) ferroelectric thin film materials are gaining more and more attention from researchers because of features such as good carrier transport and strong visible‐infrared absorption, stable working performance and low manufacturing cost. [ 26,49–51 ]…”

Section: Methodsmentioning

confidence: 99%

“…Ferroelectric materials are generally considered to be wide bandgap semiconductors with bandgaps between 3.0 and 3.8 eV, [24][25][26][27][28][29] and their low absorption coefficient and photocurrent density limit the photovoltaic applications of ferroelectric materials. [30] As shown in Figure 1, photovoltaic materials with a bandgap of 1.0-1.8 eV can absorb the solar spectrum with maximum efficiency (Figure 1a,b), [31] and hexagonal ferrites (h-RFOs) with a narrow bandgap (1.1-2.0 eV) can absorb light in a very wide range of wavelengths (Figure 1c,d).…”

Section: Introductionmentioning

confidence: 99%

Narrow Bandgap Inorganic Ferroelectric Thin Film Materials

Yang

2022

Adv Materials Inter

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(2 of 18)www.advmatinterfaces.de Figure 1. a) Spectra of solar radiance and UV-Vis-near IR absorption of BiFeO 3 and KBiFe 2 O 5 thin film materials and b) maximum theoretical efficiency versus bandgap. Reproduced with permission. [31] Copyright 2013, Springer Nature. c) The ultraviolet-visible-near-infrared (NIR) absorption spectrum hexagonal of and d) tauc plots of the ferrites (h-RFOs) with a narrow bandgap for the direct bandgap transition. Reproduced with permission. [32]

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“…Tais mudanças na composição e no arranjo estrutural podem causar mecanicamente tensões internas na partícula e eletronicamente mudança na estrutura de bandas. Tais novos arranjos -mecânico e eletrônico -resultam na diferença de sobreposição dos orbitais, infl uenciando assim na semicondutividade, isto é, na possível diminuição do gap energético (Alkathy et al, 2021).…”

Section: Características óPtica E Eletrônicaunclassified

RHODAMINE B PHOTODEGRADATION OVER Ag3 PO4 /SBA-15 UNDER VISIBLE RADIATION BASED ON WLEDS LIGHT

Nolêto¹,

Lopes²,

Vieira³

et al. 2021

A Geração De Novos Conhecimentos Na Química 2

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Direitos para esta edição cedidos à Atena Editora pelos autores. Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0).O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação com base em critérios de neutralidade e imparcialidade acadêmica.A Atena Editora é comprometida em garantir a integridade editorial em todas as etapas do processo de publicação, evitando plágio, dados ou resultados fraudulentos e impedindo que interesses financeiros comprometam os padrões éticos da publicação. Situações suspeitas de má conduta científica serão investigadas sob o mais alto padrão de rigor acadêmico e ético.

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Bandgap narrowing of Ba0.92Na0.04Bi0.04TiO3 ferroelectric ceramics by transition metals doping for photovoltaic applications

Cited by 44 publications

References 75 publications

Effect of Gamma Irradiation on the Structural, Optical, Electrical, and Ferroelectric Characterizations of Bismuth-Modified Barium Titanate Ceramics

Effect of Gamma Irradiation on the Structural, Optical, Electrical, and Ferroelectric Characterizations of Bismuth-Modified Barium Titanate Ceramics

Narrow Bandgap Inorganic Ferroelectric Thin Film Materials

RHODAMINE B PHOTODEGRADATION OVER Ag3 PO4 /SBA-15 UNDER VISIBLE RADIATION BASED ON WLEDS LIGHT

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