The photoelectric conversion efficiency of perovskite solar cells has exceeded 25% in just 7 years, which is comparable to the traditional crystalline silicon solar cells that have been developed for more than 40 years. With the in-depth study of performance, the scientific mechanism research has attracted more and more attention. Recently, Associate Professor Li Yuelong of the School of Electronic Information and Optical Engineering of Nankai University and Prof. Hongwen Jing from the School of Chemistry and Chemical Engineering of Xiamen University and Academician Colin Lambert of Lancaster University in the United Kingdom have reported the nanoscale charge of perovskite materials for the first time in the world. The unique quantum interference effect in transportation provides the possibility of preparing perovskite materials and devices based on quantum effects. Related research results were published online in the international authoritative journal Nature.
Perovskite materials have become a research hotspot in materials science in recent years due to their excellent optoelectronic properties, and have been successfully applied in solar cells, light-emitting diodes, and photodetectors. "The transport process of charge in perovskite materials is one of the key steps that affect its performance. To understand and study the unique effects of electron transport at the nanometer scale in perovskite materials, on the perovskite materials and devices The further improvement of design and performance has important guiding significance. "Li Yuelong said.
To this end, researchers such as Li Yuelong designed and synthesized a series of perovskite quantum dots, and carried out in-situ tests on perovskite quantum dots by relying on scientific instruments with picometer-level displacement control accuracy independently developed by the team of professor Hongwen Jing of Xiamen University. Through the sliding of the gold electrode between the perovskite unit cells, the researchers achieved a charge transport test between different connection sites on a single unit cell with a distance of only 5 Angstroms, and unexpectedly observed that when the electrodes are connected to the same crystal When the cells are at different sites, their charge transport capability is significantly enhanced by nearly an order of magnitude. By collaborating with Academician Colin Lambert, the researchers revealed this unreported phenomenon of conductivity enhancement due to the quantum interference effect that occurs when charge transport passes through nanoscale perovskite materials.
This important breakthrough in interdisciplinary international cooperation has successfully extended the quantum interference research system to the field of perovskite materials, which is expected to uncover the secrets behind high-efficiency perovskite solar cells and other optoelectronic devices and open up new high-performance based on quantum effects A new field of research for perovskite photovoltaic devices. (Qiao Renming, correspondent of Chen Xi)
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