Recently, the research group Pan Xu of the Institute of Applied Technology of the Chinese Academy of Sciences' Hefei Institute of Physical Science has made new progress in the preparation of a high-continuity perovskite solar cell electron transport layer. Related research results were published in the ACS Applied Materials & Interfaces.
Compared with flat-plate perovskite solar cells, mesoporous perovskite solar cells are more stable, but they first need to prepare a dense hole blocking layer on a conductive substrate, and then prepare a mesoporous layer. TiCl4 solution or Other The modification process, which has led to the relatively complicated preparation process of mesoporous perovskite solar cells and relatively poor battery consistency.
The research group Zhang Xuhui et al. used the one-step method to prepare a dense mesoporous continuous layer (CCM) for these problems. By one-step spin-coating of a dense mesoporous continuous layer precursor solution followed by annealing, a continuous dense mesoporous layer is obtained on the conductive substrate (the lower half is dense and the upper half is mesoporous. See surface morphology and cell structure. Figure 1a,b) simultaneously acts as a hole blocking and as an electron transport skeletal layer. The formation of special porous mesoporous layers is more conducive to the deposition of perovskite layers. Since the dense hole blocking layer and the mesoporous layer are one-step prepared and continuous, there is no layer-to-layer contact between the dense hole blocking layer and the mesoporous layer of the conventional mesoporous perovskite solar cell, so it is more favorable for electrons in the TiO2. The transmission within the film reduces the electronic recombination, and its photoelectric conversion efficiency increases from 11.90% to 15.76%. At the same time, because the CCM TiO2 layer is more uniform, the preparation is greatly simplified compared to the conventional mesoporous perovskite battery, so the consistency of the battery has also been greatly improved (FIG. 1c). The relevant research results have certain reference significance for the development of new high-conformity mesoporous perovskite solar cells.
The above research was supported by the National Key Basic Research Development Project ("973") project and the National Natural Science Foundation of China.
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