Preparation method of organic dopant DMAI in efficient inorganic CsPbI3 perovskite
A perovskite and dopant technology, which is applied in the field of N,N-dimethylammonium iodide preparation, can solve the problems of reducing the photoelectric conversion efficiency of perovskite cells, increasing grain boundaries, etc., so as to improve the photoelectric conversion efficiency, Effects of high crystallinity, improved stability and optoelectronic properties
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Embodiment 1
[0027] a. Add 20ml of hydroiodic acid solution to 20ml of N,N-dimethylformamide solution to form a mixed solution, stir at low temperature for 4h, and mark it as solution A.
[0028] b. Rotate solution A in a water bath at 90°C for 3 hours, until it becomes viscous;
[0029] c. Dissolve the viscous substance in 50ml of ethanol to form a clear solution B;
[0030] d. Add 250ml of diethyl ether into solution B, extract the precipitate, and mark it as C precipitate;
[0031] e. heat-treat the C precipitate prepared above in an oven at 40° C. for more than 4 hours to obtain DMAI powder with high crystallinity.
[0032] Embodiment 1 utilizes the inorganic CsPbI prepared by gained DMAI powder 3 The scanning electron microscope image of the perovskite thin film is shown in figure 2 shown.
Embodiment 2
[0034] a. Add 40ml of hydroiodic acid solution to 20ml of N,N-dimethylformamide solution to form a mixed solution, stir at low temperature for 4h, and mark it as solution A.
[0035] b. Rotate solution A in a water bath at 90°C for 3.5 hours, until it becomes viscous;
[0036] c. Dissolve the viscous substance in 60ml of ethanol to form a clear solution B;
[0037] d. Add 300ml of diethyl ether into solution B, extract the precipitate, and mark it as C precipitate;
[0038] e. heat-treat the C precipitate prepared above in an oven at 40° C. for more than 4 hours to obtain DMAI powder with high crystallinity.
[0039] Embodiment 2 utilizes the inorganic CsPbI prepared by gained DMAI powder 3 The scanning electron microscope image of the perovskite thin film is shown in image 3 shown.
Embodiment 3
[0041] a. Add 60ml of hydroiodic acid solution to 20ml of N,N-dimethylformamide solution to form a mixed solution, stir at low temperature for 4h, and mark it as solution A.
[0042] b. Rotate solution A in a water bath at 90°C for 4 hours, until it becomes viscous;
[0043] c. Dissolve the viscous substance in 70ml of ethanol to form a clear solution B;
[0044] d. Add 350ml of diethyl ether into solution B, extract the precipitate, and mark it as C precipitate;
[0045] e. heat-treat the C precipitate prepared above in an oven at 40° C. for more than 4 hours to obtain DMAI powder with high crystallinity.
[0046] The obtained DMAI powder of embodiment 3 prepares inorganic CsPbI 3 The scanning electron microscope image of the perovskite thin film is shown in Figure 4 As shown, the grain size is more obvious, and the film is denser and smoother.
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