[사이테크 플러스] Development of high-efficiency next-generation solar cell materials… Publication of the cover paper for’Nature’

Dr. Jang-won Seo’s team at the Korea Research Institute of Chemical Technology announced on the 25th that it has dramatically improved efficiency by developing a new material for the electron transport layer that can increase the voltage and a new material for the perovskite layer that can increase the current among the layers that make up the perovskite solar cell. .

The results of this study were published in the international academic journal’Nature’ as the cover paper on the day.

Perovskite is a material with a special structure that exhibits nonconductor, semiconductor, conductor properties and superconductivity, and can be easily manufactured by a low-temperature solution process using inexpensive chemical materials, and has been attracting attention as a candidate for the next generation solar cell to replace the existing silicon solar cell. .

However, perovskite solar cells still have many challenges to overcome for industrialization, such as lower photoelectric conversion efficiency for converting light into electricity than conventional silicon solar cells, and increasing stability for long-term use in real environments.

In this study, the research team developed an electron transport layer material and a perovskite layer material that affect voltage and current in order to increase the efficiency of perovskite solar cells.

An electron transport layer material with reduced defects preventing electron transport (transport) was made by a chemical solution evaporation method that directly synthesizes tin oxide (SnO₂) on the transparent electrode, which is a solar cell, to form an electron transport layer, thereby increasing the voltage of the battery.

In addition, it increased the current by developing a method of synthesizing a perovskite layer material that can absorb more light. The perovskite layer composed of a perovskite crystal structure contains black crystals that absorb light well and yellow crystals that do not absorb light well. It was made to absorb light well.

The research team reported that the perovskite solar cell made of these materials recorded the highest efficiency officially certified by the National Renewable Energy Research Institute (NREL) at the time in September 2019 with a photoelectric conversion efficiency of 25.2% at 0.1㎠. He explained that it achieved the world’s highest efficiency at 23%, showing the possibility of large area.

The luminous efficiency, which is one of the indicators of the excellence of solar cell efficiency, recorded 17%, which is much higher than the existing perovskite solar cell, which is 5-10%, and proved for the first time that it can be applied to displays as well as the field of renewable energy. Added.

Dr. Jang-Won Seo said, “Efficiency of 25% or more is equivalent to 80.5% of the theoretical maximum efficiency of perovskite solar cells. If further efficiency improvement is achieved, more than 26% efficiency is possible, so the highest efficiency of existing silicon solar cells (26.7 %).”

[email protected]

Unauthorized reproduction-prohibition of redistribution>
2021/02/25 01:00 sent