A kind of preparation method of perovskite solar cell

Abstract

The invention discloses a method for preparing a perovskite solar cell, which comprises the following steps: (1) cleaning a transparent conductive substrate; (2) preparing a dense hole blocking layer by spin coating on the transparent conductive substrate; (3) preparing a dense hole blocking layer on the dense Spin coating on the hole blocking layer to prepare the mesoporous electron transport layer; (4) prepare the perovskite thin film light absorbing layer on the mesoporous electron transport layer by continuous drop coating; (5) prepare the light absorbing layer on the perovskite thin film The hole transport layer is prepared by spin coating on the layer; (6) the metal back electrode is vapor-deposited on the hole transport layer, and it is completed. The preparation method of the present invention utilizes the continuous drop coating method to prepare the perovskite absorbing layer, and the prepared absorbing layer film has good crystallinity and is easy to control, and the obtained perovskite solar cell has larger grain fluctuations and more regular grains. The short-circuit current, open-circuit voltage and fill factor of the device are higher than those of the liquid-phase two-step method in the prior art, and finally a perovskite solar cell with high energy conversion efficiency and good device repeatability is realized.

Description

technical field [0001] The invention specifically relates to a method for preparing a perovskite solar cell. Background technique [0002] Perovskite solar cells were rated as one of the top ten scientific breakthroughs of the year by "Science" magazine in 2013. They have the potential advantages of high conversion efficiency, low cost and simple preparation process. In just five years, the efficiency of perovskite solar cells has reached From 3.8% to 20.1%, it has become the most concerned, hottest and fastest-growing direction in the field of solar cells. [0003] At present, there are mainly three preparation methods for perovskite solar cells: liquid phase one-step method, liquid phase two-step method, and vapor phase deposition method. The vapor phase deposition method is only applicable to planar structure cells, and the required conditions are high vacuum and high cost; so the current The most commonly used perovskite deposition methods are liquid-phase one-step meth...

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Problems solved by technology

[0003] At present, there are mainly three preparation methods for perovskite solar cells: liquid phase one-step method, liquid phase two-step method, and vapor phase deposition method. The vapor phase deposition method is only applicable to planar structure cells, and the required condition is high vacuum and high cost; so the current The most commonly used perovskite deposition methods are liquid-phase one-step method or liquid-phase two-step method. The liquid-phase one-step method is very sensitive to film-forming conditions, and it is difficult to control the morphology; the liquid-phase two-step method generally requires heating. PB 2 film, which was then immersed in MAI / IPA solution or MAI / IPA was loaded onto heated crystallized PbI 2 On the thin film, this method is not conducive to the complete conversion of perovskite. There are more lead iodide residues, and the film morphology is difficult to control, which is not conducive to the absorption of photons by the film and thus affects the device efficiency; The film morphology is easy to control, and the preparation method of low-cost high-efficiency perovskite solar cells is particularly important

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