Recently, Guo Xin, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Li Can, a member of the Chinese Academy of Sciences, have made new progress in the development of hole transport materials for perovskite solar cells. The relevant research results were published in "Angel. Chem" . Int. Ed.) And was selected as a VIP (Very Important Paper) paper.
Organic-inorganic hybrid perovskite solar cells have received widespread attention due to their high photoelectric conversion efficiency, and hole transport materials (HTM) play an important role in improving device efficiency. At present, the most widely used HTM is Sprio-OMeTAD, but the molecule has high symmetry, which is easy to crystallize, resulting in poor film stability and pinhole defects. This not only reduces the stability of the device, but also does not apply to large-area devices. The preparation of this product greatly limits its application in perovskite solar cells.
In order to solve the above problems of Sprio-OMeTAD, based on the previous work (Nano Energy, Small, Solar RRL), the team based on the idea of ​​"reducing molecular symmetry and improving the stability of thin film morphology", from the core of the original Sprio-OMeTAD A new spiro-indene with low symmetry, "spiro-indene" was "cut out", and a new hole-transporting molecule Spiro-I was successfully synthesized by combining carbazole-type dendrimer units on the periphery. Compared with the quasi-spherical Sprio-OMeTAD, the new molecule has a V-shaped structure and lower molecular symmetry, so the crystallization tendency of the molecule is effectively suppressed, and it is easier to form a high-quality thin film without pinholes. The use of Spiro-I as HTM for the preparation of perovskite solar cells is superior to the classic material Sprio-OMeTAD in terms of large-area devices and device stability. In addition, the molecular synthesis cost is lower, and the amount used in the device processing is less, which is conducive to reducing the overall cost of the battery. This work provides new hole-transporting materials for the preparation of highly efficient, stable, and low-cost perovskite solar cells, and also provides new ideas for the molecular design of hole-transporting materials, which will help promote perovskite solar cells. Further development.
In addition, the team has been devoted to the research work of the carrier transport layer and the interface modification of new photovoltaic devices. In addition to the perovskite solar cell hole transport material developed this time, they have also reported on the electronic and Hole transport materials, and achieved excellent device performance (J. Mater. Chem. A, J. Mater. Chem. A, Org. Electron., J. Mater. Chem. A, ACS Appl. Mater. Interfaces). These work will contribute to the further development of the key material system required by the new type of photovoltaic technology with independent intellectual property rights.
The above research work was supported by the "Thousand Talents Program" youth project, the National Natural Science Foundation of China, the two integration funds, and the postdoctoral fund.
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