Graphene discovered by Qingdao Energy can be used as the main material in perovskite batteries

Two-dimensional carbon graphyne (GD) is a full-carbon superstructure with a two-dimensional planar network formed by 1,3-diyne bonds conjugating benzene rings. It has abundant carbon chemical bonds, large conjugated systems, and wide surfaces Spacing, excellent chemical stability, and semiconductor performance have been widely used in various fields such as biology, energy, catalysis, information technology, and energy storage. It is the first carbon material with independent intellectual property rights in China. Graphyne has a natural band gap and is a type of intrinsic semiconductor with high charge transport capability. Due to its special electronic structure and excellent semiconductor performance similar to silicon, it has gained important applications in many fields of energy and solar cells.

The huge global demand for renewable energy has promoted the vigorous development of perovskite solar cells. At present, the common hysteresis effect and stability problems of perovskite solar cells have seriously hindered their large-scale industrial application. How to prepare a battery device with excellent performance and good stability is an urgent problem to be solved. Under the guidance of Li Yuliang, an academician of the Chinese Academy of Sciences, the Jiu Tonggang team of the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, first used graphyne as the main material of the active layer of the battery. The battery efficiency is up to 21.01%. The study found that when graphyne is used as the host material, the rich π electrons of graphyne have a clear coordination effect with the lead in the perovskite precursor solution, thereby delaying the crystallization rate of perovskite and realizing large grain size, The perfect combination of fewer grain boundaries and high crystallinity. While realizing the improvement of photoelectric performance, the hysteresis effect and stability have also been greatly improved.

Subsequently, the researchers explored the reasons for the device performance improvement from the aspects of transient fluorescence, exciton generation rate, and conductivity. The results showed that the introduction of graphyne not only effectively reduced the grain boundary, but also suppressed the recombination of charge at the grain boundary. Effectively improve the charge transfer, these effects are conducive to the improvement of the device fill factor and short-circuit current density, which in turn improves the device performance. At the same time, due to the improvement of the quality of the perovskite film and the reduction of the density of defect states, the hysteresis effect and stability of the device have also been greatly improved.

The study shows that this is the first time that carbon materials can be used as host materials for solar cells. Graphene as a host material for perovskite has great potential for improving the performance of perovskite solar cell devices. It is also a research for perovskite cell devices. Work provides a new way of thinking. Related research results were published in Nano Letters (2018, 18, 6941-6947).

The research was supported by the National Natural Science Foundation of China, the Fundamental Basic Research Project of the Shandong Natural Science Foundation, and the Youth Promotion Association of the Chinese Academy of Sciences.


Figure: Perovskite device structure and photoelectric performance prepared with graphyne as the main material

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