A solution preparation method of cspbi3 thin film and its application in photovoltaic devices
A technology of thin film and solution, which is applied in the field of preparation process of thin film solar cell photovoltaic devices, can solve problems such as easy moisture absorption, limit the development of inorganic perovskite solar cells, and inert photovoltaic performance of devices, and achieve simple preparation methods and avoid expensive vacuum The effect of investing in evaporation equipment and avoiding cumbersome glove box operations
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Embodiment 1
[0032] CsPbI in this example 3 The solution preparation method of thin film, comprises the steps:
[0033] 1. CsPbI 3 Preparation of precursor solution: 0.5mmol CsI (129mg) and 0.5mmol PbI 2 (231mg) was added to 2mL DMF (N,N-dimethylamide) and stirred until it was completely dissolved, then 66μL HI (57wt%) was added to aid in dissolution, and the stirring was continued until it was completely dissolved, then left to age for 48hrs to obtain yellow CsPbI 3 Precursor solution, such as figure 2 as shown in (a);
[0034] 2. CsPbI 3 Precursor film preparation: Spin-coat the CsPbI on the FTO glass substrate 3 Precursor solution, the rotation speed is 2000rpm, the spin coating time is 30s, and then placed on a heating plate at 100°C for 10min to obtain CsPbI 3 Precursor thin films, such as figure 2 As shown in (b), while the film is placed in the air, the phase transition occurs rapidly, such as image 3 as shown in (a);
[0035] 3. CsPbI 3 Film preparation: Add 30 mL of iso...
Embodiment 2
[0037] CsPbI in this example 3 Schematic diagram of the structure of inorganic perovskite photovoltaic devices. figure 1 As shown, the FTO conductive glass is used as the substrate, and the electron transport layer, CsPbI, and CsPbI are sequentially deposited on the surface of the FTO film of the FTO conductive glass from bottom to top. 3 The light absorbing layer thin film, the hole transport layer and the top electrode, the specific preparation method is:
[0038] 1. Deposit a dense layer of TiO on the surface of the FTO film of the FTO conductive glass 2 The thin film is used as an electron transport layer: that is, a dense layer of TiO is deposited on the FTO glass (directly purchased) by spin-coating an isopropyl titanate ethanol solution. 2 , and then sintered in air at 450-500°C for 30-60 minutes to obtain a dense layer of TiO 2 thin film; the dense layer of TiO 2 Thin film immersed in 40mM TiCl 4 In an aqueous solution, treat at 70° C. for 30 minutes, and then sin...
Embodiment 3
[0046] In this example, a perovskite solar cell is prepared in the same manner as in Example 2, except that the standing aging time in step 2 is 6 hrs.
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