Preparation method of Cs<n>FA<1-n>PbX<3> perovskite thin film
A csnfa1-npbx3, perovskite technology, applied in semiconductor/solid-state device manufacturing, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problem of difficult to obtain pure equality, achieve low cost, reduce production facilities requirements, Good film forming effect
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Example Embodiment
[0038] Example 1
[0039] This embodiment relates to a kind of cesium iodide (CsI), iodoformamidine (FAI), lead iodide (PbI) 2 ) and dimethylamine hydroiodide (DMAI) were dissolved in DMF and spin-coated to prepare pure Cs 0.5 FA 0.5 PbI 3 A method for a perovskite thin film, the method comprising the steps of:
[0040] 1) 0.091g CsI, 0.060g FAI, 0.323g PbI 2 and 0.121g DMAI were dissolved in 1mL DMF to obtain precursor solution A; CsI, FAI, PbI in the above solution 2 , The molar ratio of DMAI is 0.5:0.5:1:1;
[0041] 2) The above-obtained precursor solution A was spin-coated on the FTO glass at 3000 rpm for 30 s, and then annealed at 210 °C for 5 min to obtain a perovskite thin film.
[0042] figure 1 For the X-ray diffraction pattern of Example 1, no phase separation was found in the pattern, which proved that pure phase Cs was successfully prepared 0.5 FA 0.5 PbI 3 Perovskite thin films. figure 2 For the UV-visible absorption spectrum of Example 1, it can be ...
Example Embodiment
[0043] Example 2
[0044] The method of this example is the same as that of Example 1, the difference lies in CsI, FAI, PbI in step 1). 2 , The molar ratio of DMAI is 0.9:0.1:1:1.
[0045] image 3 For the X-ray diffraction pattern of Example 2, no phase separation was found in the pattern, indicating that pure phase Cs was obtained 0.9 FA 0.1 PbI 3 Perovskite thin films. Figure 4 For the UV-visible absorption spectrum of Example 2, it can be seen that the characteristic absorption of perovskite appears at 742 nm. The band gap of the obtained perovskite film is 1.67 eV.
Example Embodiment
[0046] Example 3
[0047] The method of this example is the same as that of Example 1, the difference lies in CsI, FAI, PbI in step 1). 2 The molar ratio of , DMAI is 0.3:0.7:1:1.
[0048] Figure 5 For the X-ray diffraction pattern of Example 3, no phase separation was found in the pattern, indicating that pure phase Cs was obtained 0.3 FA 0.7 PbI 3 Perovskite thin films. The band gap of the obtained perovskite film is 1.58 eV.
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