Nb-doped titanium-oxide nano spindle body and preparation method and application thereof
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A titanium oxide and spindle technology, applied in the field of solar cells, can solve the problems of low efficiency, low efficiency, and hysteresis of flat-panel cells, and achieve the effects of uniform particle size, simple preparation method, and good repeatability
Active Publication Date: 2018-09-18
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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In 2016, it was reported that by adding NbCl 5 Synthesis of Nb-doped titanium oxide nanocrystals, the obtained cell efficiency is 16.3%, but the efficiency is low
In 2017, with NbCl 5 Get 1% Nb:TiO 2 , when it is used in the electron transport layer of flat perovskite cells, the cell efficiency in reverse sweep is 19.2%, while the cell shows improved stability, however it shows some hysteresis (efficiency in forward sweep 16.21%)
And now the certified efficiency of flat cell is 21.6%, in the above results Nb:TiO 2 The efficiency of the obtained planar cells is slightly lower, and the precursors of Nb used in them are all NbCl 5 , Niobium chloride is a substance that is easily hydrolyzed and will release HCl, which will have a certain corrosion effect on the human body and the substrate ITO of the perovskite battery
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Embodiment 1
[0032] A preparation method of a Nb-doped titanium oxide nano-spindle body, comprising:
[0033] Add 5ml of butyl titanate to 15-25ml of glacial acetic acid solution, and then in the process of stirring, according to the doping ratio of Nb / (Nb+Ti) (molar ratio) 0%--20%, niobium ethanol Add to the above solution, and continue to stir to obtain a clear precursor solution of niobium-doped titanium oxide;
[0034] Then pour the above solution into a stainless sodium reaction kettle lined with polymethyl fluoride; then put the sealed reaction kettle into a constant temperature drying oven, react at 150-240°C for 16-48 hours, and then cool naturally to At room temperature, a white or blue precipitate is obtained; wash all the precipitates repeatedly with deionized water and ethanol (generally wash once with deionized water, then repeatedly wash with ethanol, centrifuge after each wash, and the supernatant is clarified after centrifugation , the cleaning is complete), that is, as at...
Embodiment 2
[0036] The invention also provides the application of the Nb-doped titanium oxide nano-spindle body, which is used in flat perovskite cells as an electron transport layer.
[0037] The specific steps applied to the flat perovskite battery are as follows:
[0038] Step 1. Deposit Nb-doped titanium oxide electron transport layer on the cleaned FTO conductive glass
[0039] The precipitate after repeated centrifugal cleaning is redispersed in ethanol to form a colloidal solution of Nb-doped titanium oxide at a certain concentration. By adding different proportions of terpineol to this colloidal solution to obtain different concentrations of spin-coating liquids, and then spin-coating at a certain speed and acceleration, a dense layer can be formed on the surface of FTO after plasma treatment. electron transport layer.
[0040] Step 2, spin-coating a perovskite battery material layer on the Nb-doped titanium oxide dense layer;
[0041] Step 3, spin-coating a hole transport mate...
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Abstract
The invention discloses a preparation method of a Nb-doped titanium-oxide nano spindle body. The preparation method comprises: butyl titanate is added into a glacial acetic acid solution, stirring iscarried out, niobium(5+) ethanolate is added into the solution based on a doping ratio of a molar ratio of Nb / (Nb+Ti)0%--20%, stirring is carried out continuously to obtain a clear precursor solution;the solution is poured into a stainless sodium reaction vessel with a polytetrafluoroethylene lining, reaction is made, natural cooling is carried out until a room temperature is reached, so that a white or blue precipitate is obtained; and all precipitates are cleaned repeatedly by using deionized water and ethanol to obtain a Nb-doped titanium-oxide nano spindle body. In addition, the inventionalso discloses a Nb-doped titanium-oxide nano spindle body and application thereof. According to the invention, the preparation method is simple; the cost is low; particle size uniformity is high; and the high crystallization effect is good. Meanwhile, a flat-plate battery obtained by using the Nb-doped titanium dioxide spinning body as an electron transport material has the high efficiency, small hysteresis and high stability.
Description
technical field [0001] The invention relates to a battery material, in particular to an Nb-doped titanium dioxide spindle body and a preparation method and application thereof, belonging to the technical field of solar cells. Background technique [0002] An ideal electron transport layer is an important part of high-efficiency planar perovskite solar cells, which plays a key role in transporting electrons and inhibiting recombination, and can achieve high Voc and FF. At present, in perovskite solar cells, the most commonly used electron transport layer is TiO 2 . However, TiO 2 It has the disadvantages of poor conductivity and low electron mobility, and metal ion doping can effectively increase its conductivity and adjust its bandgap structure and defect states. Metal elements currently used for doping titanium oxide include: magnesium, lithium, samarium, tantalum, etc. Niobium-doped titanium oxide has been widely used in transparent conductive electrodes, photocatalysi...
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