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. Solve the effect of Fe valence, easy doping modification, and reducing leakage current density
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Embodiment 1
[0024] 1) Put 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 a mixture of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 0.94:1:0.11, stirred for 2 h to make it uniform, and the precursor solution A was obtained; 3 ) 3 ·5H 2 O, Fe (NO 3 ) 3 ·9H 2 O and Sm (NO 3 ) 3 ·6H 2O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 0.91:1:0.14, and stirred for 2 hours to make it uniform to obtain precursor solution B; wherein, the total metal ions in precursor solution A and precursor solution B are The concentration is 0.3mol / L; the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixture is 3:1;
[0025] 2) Let the precursor solution A stand for 24 hours, and then spin-coat the static precursor solution A on the FTO / glass substrate, bake it at 200 °C for 8 minutes to obtain a dry film, and then anneal it at 550 °C for 10 minutes. Tb-doped...
Embodiment 2
[0032] 1) Put 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 a mixture of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 0.91:1:0.14, and stirred for 2 h to make it uniform to obtain precursor solution A; 3 ) 3 ·5H 2 O, Fe (NO 3 ) 3 ·9H 2 O and Sm (NO 3 ) 3 ·6H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 0.90:1:0.15, and stirred for 2 hours to make it uniform to obtain precursor solution B; wherein, the total metal ions in precursor solution A and precursor solution B are The concentration is 0.5mol / L; the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixture is 1:1;
[0033] 2) Let the precursor solution A stand for 28 hours, and then spin-coat the static precursor solution A on the FTO / glass substrate, bake it at 180 °C for 10 minutes to obtain a dry film, and then anneal it at 550 °C for 8 minutes to obtain a dry f...
Embodiment 3
[0037] 1) Put 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 a mixture of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 0.97:1:0.08, stirred for 2 h to make it uniform, and obtained precursor solution A; 3 ) 3 ·5H 2 O, Fe (NO 3 ) 3 ·9H 2 O and Sm (NO 3 ) 3 ·6H 2 O is dissolved in a mixture of ethylene glycol methyl ether and acetic anhydride in a molar ratio of 0.97:1:0.08, and stirred for 2 hours to make it uniform to obtain precursor solution B; wherein, the total metal ions in precursor solution A and precursor solution B are The concentration is 0.1mol / L; the volume ratio of ethylene glycol methyl ether and acetic anhydride in the mixture is 4:1;
[0038] 2) Let the precursor solution A stand for 32 hours, and then spin-coat the standing precursor solution A on the FTO / glass substrate, bake it at 260 °C for 12 minutes to obtain a dry film, and then anneal it at 550 °C for 9 minutes to obtain a dry...
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