A large-area preparation method for perovskite thin films suitable for various substrate shapes
A perovskite and thin film technology, which is applied in the field of large-area preparation of perovskite thin films, can solve the problems of restricting the large-scale preparation of perovskite thin films, restricting the development and application of flexible perovskite photovoltaic devices, and difficult spin-coating operations. The effect of avoiding expensive vacuum evaporation equipment investment, low-cost high-quality preparation, and avoiding glove box operation
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Embodiment 1
[0028] In this embodiment, a perovskite light-absorbing layer film is prepared with a curved rigid glass as a substrate, and the specific steps are as follows:
[0029] a. Use soapy water, acetone, and ethanol to ultrasonically clean the curved glass substrate for 20 minutes, then dry it with nitrogen wind, and set aside;
[0030] b. In a 250mL beaker, add 20mL of Pb(NO 3 ) 2 solution, 10mL of 1.5M thiourea solution, 26mL of 26% ammonia water and 144mL of deionized water were added, and then stirred at room temperature for 5 minutes at a speed of 1000rpm to obtain a lead sulfide reaction solution.
[0031] c. Put the cleaned substrate into the lead sulfide reaction solution, then put the beaker in a water bath at 70°C, and react for 30 minutes; after the reaction in the chemical bath, take out the substrate and rinse the surface of the sample with deionized water, Dry the sample with nitrogen wind to obtain a high-quality PbS precursor film;
[0032] d. Combine PbS film wit...
Embodiment 2
[0038] In this embodiment, the perovskite light absorbing layer CH is prepared in the same manner as in Example 1. 3 NH 3 PB 3 thin film, the only difference is that the temperature of the heating stage in step d is 180°C, and the reaction time is 30 minutes.
[0039] After characterization, the CH prepared in this example 3 NH 3 PB 3 The film is similar to Example 1, the surface is uniform and smooth, and the film quality is high.
Embodiment 3
[0041] In this embodiment, the perovskite light absorbing layer CH is prepared in the same manner as in Example 1. 3 NH 3 PB 3 thin film, the only difference is that step d is carried out as follows:
[0042] Put the PbS film as the reactant, place it on a heating platform, put 2g of iodine beside it, cover it with a black cover, heat to 100°C, and react for 60 minutes to obtain PbI 2 film;
[0043] PbI 2 The film was immersed in CH at a concentration of 10 mg / mL 3 NH 3 I in isopropanol solution, the soaking time is 2 minutes, the soaking temperature is 25 ℃, after the reaction is completed, take it out and dry it to get CH 3 NH 3 PB 3 film.
[0044] After characterization, the CH prepared in this example 3 NH 3 PB 3 The film is similar to Example 1, the surface is uniform and smooth, and the film quality is high.
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