Layer-by-layer alternatively doped low-leakage-current BiFeO3 film and preparation method thereof
A technology of alternating doping and leakage current, which is applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve the problems that ferroelectricity cannot be correctly measured in saturated polarization, limit the application of thin films, and low dielectric constant, etc., and achieve Solve the effect of Fe price change, easy doping modification, and reduce leakage current density
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Embodiment 1
[0024] 1) Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and Tb(NO 3 ) 3 ·6H 2 O was dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.94:1:0.11, and stirred for 2 hours to make it uniform to obtain precursor solution A; Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and Sm(NO 3 ) 3 ·6H 2O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.91:1:0.14, stirred for 2 hours to make it uniform, and obtains precursor solution B; wherein, the total metal ions in precursor solution A and precursor solution B The concentration is 0.3mol / L; the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixed solution is 3:1;
[0025] 2) Let the precursor solution A stand for 24 hours, then spin-coat the precursor solution A on the FTO / glass substrate, bake at 200°C for 8 minutes to obtain a dry film, and then anneal at 550°C for 10 minutes to obtain Tb-dop...
Embodiment 2
[0032] 1) Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and Tb(NO 3 ) 3 ·6H 2 O was dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.91:1:0.14, stirred for 2 hours to make it uniform, and obtained precursor solution A; Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and Sm(NO 3 ) 3 ·6H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.90:1:0.15, stirred for 2 hours to make it uniform, and obtains precursor solution B; wherein, the total metal ions in precursor solution A and precursor solution B The concentration is 0.5mol / L; the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixed solution is 1:1;
[0033] 2) Let the precursor solution A stand for 28 hours, then spin-coat the precursor solution A on the FTO / glass substrate, bake it at 180°C for 10 minutes to obtain a dry film, and then anneal at 550°C for 8 minutes to obtain Tb...
Embodiment 3
[0037] 1) Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and Tb(NO 3 ) 3 ·6H 2 O was dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.97:1:0.08, stirred for 2 hours to make it uniform, and obtained precursor solution A; Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and Sm(NO 3 ) 3 ·6H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 0.97:1:0.08, stirred for 2 hours to make it uniform, and obtains the precursor solution B; wherein, the total metal ions in the precursor solution A and the precursor solution B The concentration is 0.1mol / L; the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixed solution is 4:1;
[0038] 2) Let the precursor solution A stand for 32 hours, then spin-coat the precursor solution A on the FTO / glass substrate, bake at 260°C for 12 minutes to obtain a dry film, and then anneal at 550°C for 9 minutes to o...
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