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As a new all-carbon nanostructure material following fullerenes, carbon nanotubes, and graphene, graphyne is rich in carbon chemical bonds, large conjugation systems, wide surface spacing, and excellent chemical stability. One of the most stable synthetic diacetylenic carbon allotropes". The unique structural characteristics of graphyne enable it to interact or bond with inorganic nanoparticles, organic polymers, dye molecules, etc., exhibiting unique electron transfer enhancement properties in information technology, energy storage, optoelectronics, catalysis, biology and medicine Other fields have important application prospects.
As a representative of a new generation of solar cells, perovskite batteries are developing 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 improvement in the performance of perovskite battery devices is partially 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 Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, has incorporated graphitic acetylene into the double-layer electron transport layer of perovskite solar cells, effectively improving electron transport. The conductance of the layer enhances the device performance of the perovskite battery and achieves a photoelectric conversion efficiency of 20%. Studies have shown that the bilayer doped graphyne improves the interface material film morphology. Due to the strong π-π conjugate structure of graphyne and the interaction between PCBM and ZnO, the electron transport properties of PCBM and ZnO interface layer are greatly enhanced. Promote. The impedance test shows that the double layer doping of graphyne reduces the recombination of charge at the interface, which makes the fill factor of the device significantly improved, thereby improving the photoelectric conversion efficiency of the device. The capacitance-voltage curve shows that the unique chemical structure and extremely strong electron transport capacity of graphyne significantly reduce the charge accumulation at the interface, significantly improving the common hysteresis effect of perovskite solar cells. The introduction of the new carbon material graphite alkyne effectively improves the performance of the perovskite battery and provides new ideas for the application and development of graphite alkyne and the study of perovskite battery devices.
Related research results were published on Nano Energy. The study was funded by the National Natural Science Foundation of China, the Major Basic Research Project of Shandong Province, the Youth Innovation Promotion Association of the Chinese Academy of Sciences, and the Qingdao Energy Development Foundation.
Fig. 1. (a), schematic diagram of perovskite solar cell device structure; (b) graphene 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) Cell impedance curve; (b) Electron lifetime of the cell under different bias voltages; (c) Capacitance of the cell under different biases; (d) Graph of action mechanism of graphyne devices.
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