As a new all-carbon nanostructure material following fullerenes, carbon nanotubes, and graphene, graphyne has rich carbon chemical bonds, large conjugation system, wide surface spacing, and excellent chemical stability. One of the most stable synthetic diacetylenic carbon allotropes. The unique structural characteristics of graphyne make it interact or bond with inorganic nanoparticles, organic polymers, dye molecules, etc., exhibiting unique electron transfer enhancements. Characteristics, with important application prospects in information technology, energy storage, photovoltaic, catalysis, biology and medicine.
As a representative of a new generation of solar cells, the perovskite battery has developed rapidly. The interface properties of the device have a great influence on the performance of the perovskite battery, which significantly affects its carrier extraction and device efficiency. The current performance of the perovskite battery device is further improved. The improvement is partly limited by the interface layer morphology and carrier transport capability.
Recently, the research group of carbon-based energy conversion materials led by Liquor Research Institute of the Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, has incorporated graphitic acetylene into the double-layered electron transport layer of perovskite solar cells, effectively improving electron transport. The conductivity of the layer, which in turn enhances the device performance of the perovskite battery, achieves a 20% photoelectric conversion efficiency. Studies have shown that the double-layer doped graphite alkyne improves the interface material film morphology due to the strong π-π conjugate of the graphyne With the interaction between the structure and PCBM and ZnO, the electron transport properties of the PCBM and ZnO interface layers have been greatly improved. Impedance tests have shown that the double doping of graphyne reduces the recombination of charge at the interface, making the device fill factor Significantly improved, thereby improving the device's photoelectric conversion efficiency. Capacitance-voltage curve shows that the unique chemical structure of graphyne, strong electron transport capability makes the charge accumulation at the interface significantly reduced, significantly improved the common hysteresis of perovskite solar cells Effect. The introduction of a new type of carbon material, graphite alkyne, effectively improves the performance of perovskite cells for the development of graphyne applications and perovskite cells. Device research provides new ideas.
The relevant research results were published on Nano Energy. The research was funded by the National Natural Science Foundation of China, a major basic research project in Shandong Province, the Youth Innovation Promotion Association of the Chinese Academy of Sciences and the Qingdao Energy Development Fund.
Fig. 1. (a), Schematic diagram of perovskite solar cell device structure; (b) Graphene acetylene chemical structure and its electron transport schematic; (c) Perovskite solar cell current-voltage curve; (d) Battery in Device behavior in different scan directions.
Figure 2. (a), Battery impedance curve; (b) Electron life of the battery under different biases; (c) Capacitance of the battery under different biases; (d) Graph of the action mechanism of the graphyne device.
