Organic-inorganic tin/lead narrow-band-gap perovskite thin film and preparation method thereof
A narrow bandgap, perovskite technology, used in semiconductor/solid-state device manufacturing, semiconductor devices, electrical components, etc., can solve problems such as poor crystal quality, inconsistent film orientation, and decreased photocurrent, achieving fewer holes and good optoelectronic properties. , Improve the effect of photoelectric performance
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Embodiment 1
[0037] 1. Take methylamine bromide (MABr, 0.475mmol), lead bromide (PbBr 2 , 0.675 mmol), dissolved in DMF / DMSO (400 μL / 50 μL) mixture, stirred at room temperature for 3 hours to give solution 1. Take formamidine hydroiodate (FAI, 0.73 mmol), methylamine chloride (MACl, 0.45 mmol), lead iodide (PbI 2 1.37 mmol), dissolved in DMF / DMSO (800 μL / 100 μL) mixture, stirred at room temperature for 3 hours to give solution 2. Solution 1 was added to solution 2, stirred at room temperature for 0.5 hours to give the precursor solution.
[0038] 2. The precursor solution is rotated to the substrate by spin coating method, and the rotation condition of the substrate during spin coating is: 1000 rpm in the first stage, the time is 10 seconds; the second stage is 5000 rpm, the time is 30 seconds. Add 40 μL of precursor solution dropwise during spin coating, and add 200 μL of chlorobenzene to the substrate coated with precursor solution dropwise at the 10th second of the second stage of rotation....
Embodiment 2
[0042] The organic - inorganic tin / lead perovskite crystallization method of Example 2 is substantially the same as That of Example 1, the difference is that the annealing temperature employed is 130 ° C, and the annealing time is 15 minutes.
[0043] From scanning electron microscopy Figure 3-4 It can be seen that the narrow band gap perovskite film cavity obtained after applying the magnetic field is reduced, and the grain size in the perovskite crystal becomes larger. There is still no crystallization of PbI in the unreformed perovskite film 2 ( Figure 3 circled out), while applying a magnetic field to the perovskite film ( Figure 4 PbI that was not involved in crystallization was not seen 2 。
Embodiment 3
[0045] 1. Take formamidine hydroiodate (FAI, 0.72 mmol) and lead iodide (PbI 2 , 1.25mmol), dissolved in DMF / DMSO (1mL, DMF:DMSO volume ratio of 4:1) mixed solution, stirred at room temperature for 3 hours to give precursor solution 1.
[0046] 2. Take methylamine iodide (MAI, 1mmol) and lead iodide (PbI 2 1mmol), dissolved in DMF / DMSO (0.8mL, volume specific to DMF:DMSO=4:1) mixed solution, stirred at room temperature for 3 hours to obtain precursor solution 2.
[0047] 3. Take methylamine bromide (MABr, 1 mmol) and lead bromide (PbBr 2 1mmol), dissolved in DMF / DMSO (0.8mL, volume specific to DMF: DMSO= 4:1) mixed solution, stirred at room temperature for 3 hours to obtain precursor solution 3.
[0048] 4. Take the precursor solution 1 (857 μL), the precursor solution 2 (143 μL) and the precursor solution 3 (200 μL), mix at room temperature and stir for 0.5 hours to give the precursor solution 4.
[0049] 5. The method of spin coating is used to spin coating the precursor solution...
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