Graphite-acetylene doping by Ningbo Materials improves perovskite solar cell performance

Graphite-acetylene doping by Ningbo Materials improves perovskite solar cell performance

In recent years, in order to solve the increasingly serious global energy and environmental issues, people have turned their attention to developing new types of solar cells with high efficiency and low cost. In many new types of solar cells, perovskite solar cells stand out thanks to their high light absorption coefficient, strong carrier transport capability, and high device efficiency, attracting the attention of many scientific researchers, and are important in the field of new solar cells. research direction.

With the rapid development of the perovskite battery, the device structure of the perovskite battery has undergone a change from a porous sensitized type to a planar type, and the core has changed the interface layer of the device. The interface layer of the device includes an electron transport layer and a hole transport layer. The interface properties of the device have a great influence on the performance of the perovskite battery, which significantly affects the carrier extraction and device efficiency. At the same time, the interface layer morphology and carrier transport capability are particularly critical for improving the device efficiency of perovskite cells.

Recently, the team led by Fang Junfeng, the Institute of New Energy Technology under the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, collaborated with Li Yuliang, a researcher of the Institute of Chemistry of the Chinese Academy of Sciences, to dope the new carbon material graphite alkyne into the electron transport layer of the hybrid perovskite device. It has effectively improved the conductance of the electron transport layer and improved the device performance of the perovskite battery. The results were published in Nano Letters [2015, 15, 2756].

Graphyne is a new carbon allotrope formed by sp, sp2 and sp3 hybrid states. The benzene rings are conjugated by 1,3-diyne linkages to form a two-dimensional planar network of all-carbon molecules. Abundant carbon chemical bonds, large conjugation systems, wide surface spacing, excellent chemical stability and semi-conductor properties. The introduction of graphite acetylene not only improves the film morphology of the interface material, but also better controls the interface characteristics, improves the short-circuit current value of the device, and thus increases the photoelectric conversion efficiency of the device, and the device efficiency is not affected by the voltage scanning conditions. The introduction of a new type of carbon material, graphite alkyne, has effectively improved the performance of perovskite batteries, providing new ideas for the next step in the application and development of new carbon materials and the study of perovskite battery devices.

The above research was supported by the National Natural Science Foundation of China, the Natural Science Foundation of Zhejiang Province, the Natural Science Foundation of Ningbo City, the "Hundred Talents Program" of the Chinese Academy of Sciences and the Youth Innovation Promotion Association of the Chinese Academy of Sciences.

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