Modified titanium dioxide nanoparticles, preparation method thereof and perovskite solar cell
A technology of solar cells and titanium dioxide, applied in the field of solar cells, can solve the problems of affecting the collection efficiency of cells, shortening the life of carriers, unfavorable diffusion, etc., and achieve the effects of improving electron transmission, improving stability and reducing accumulation.
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[0036] The present invention also provides a method for preparing the above-mentioned modified titanium dioxide nanoparticles, comprising the following steps: S1) mixing the alkyl titanate with an alcohol solvent, adding an acidic solution, stirring and reacting, and aging to obtain a titanium dioxide nano-precursor solution S2) after cadmium sulfide and / or zinc sulfide nanoparticles are dispersed in the ethanol mixed solution and stirred, add the titanium dioxide nano-precursor solution obtained in step S1), and stir and react under the condition of avoiding light to obtain modified titanium dioxide nanoparticles; The ethanol mixed solution includes ethanol and ammonia water ethanol solution.
[0037] Wherein, in the present invention, there is no special restriction on the sources of all raw materials, and they can be commercially available.
[0038]Mix the alkyl titanate with an alcohol solvent; the alkyl titanate is preferably isopropyl titanate and / or butyl titanate; the ...
Embodiment 1
[0064] 1.1 First, 0.13 mmol of isopropyl titanate and 2.5 ml of ethanol were added to a 10 ml volumetric flask, and after stirring for 10 min, 40 μL of hydrochloric acid (2 mol / L) was added dropwise while stirring as a reaction control agent. After vigorous stirring for 2h, the sol was poured into a 10ml beaker and aged at room temperature. During the aging process, the hydrolysis and polycondensation reactions of isopropyl titanate occurred continuously, and the aging time of the precursor solution was 4h.
[0065] 1.2 Wash 0.1 mmol of CdS nanoparticles with ethanol, centrifuge at 12000 rpm, and wash twice. Then it was dispersed in 10ml of ethanol mixed solution (which contained 1ml of 4% ammonia water ethanol solution), after stirring for 15min, 1ml of TiO in step 1) of aging for 4h was added dropwise 2 Nanoparticle precursor solution. The reaction was first stirred in the dark for 24 h, and then the solution was washed by centrifugation to form TiO 2 Nanoparticles with a...
Embodiment 2
[0068] 2.1 First, 0.13 mmol of isopropyl titanate and 2.5 ml of ethanol were added to a 10 ml volumetric flask, and after stirring for 10 min, 40 μL of hydrochloric acid (2 mol / L) was added dropwise while stirring as a reaction control agent. After vigorous stirring for 2h, the sol was poured into a 10ml beaker and aged at room temperature. During the aging process, the hydrolysis and polycondensation reactions of isopropyl titanate occurred continuously, and the aging time of the precursor solution was 6h.
[0069] 2.2 The 0.07 mmol CdS nanoparticles were washed with ethanol, centrifuged at 12000 rpm, and washed twice. Then it was dispersed in 10ml of ethanol mixed solution (which contained 1ml of 4% ammonia water ethanol solution), after stirring for 15min, 1ml of TiO in step 1) of aging for 4h was added dropwise 2 Nanoparticle precursor solution. The reaction was first stirred in the dark for 24 h, and then the solution was washed by centrifugation to form TiO 2 Nanopart...
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Abstract
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