RMIT advances next-generation solar cell technology

The RMIT University (RMIT) research team collaborates with top Australian and Japanese scientists to advance the next generation of solar cell technology.

The RMIT, CSIRO, and Japan Science and Technology Agency's joint research and development projects focus on the use of nanotechnology to make photovoltaic cells that are cheaper and less toxic.

For printable solar cell applications, the research team actively explored the use of low-cost, elemental semiconductor nanocomposites. Recently, the research results have been published in the high-impact Journal of the American Chemical Society.

The RMIT research team is led by Professor Yasuhiro Tachibana of RMIT Aerospace, Mechanical and Manufacturing Engineering.

Prof Tachibana said: "The focus of the photovoltaic industry has always been on the reduction of materials and production costs for panels."

"In order to meet industry requirements, the research team is committed to the development of new, low-cost and low-toxicity colloidal nanomaterials. Therefore, the next generation of solar cells is of great significance."

Colloidal nanocrystals can be quickly and inexpensively applied to printers as "ink."

At present, despite the toxicity concerns, the main material of colloidal nanocrystals is still cadmium or lead.

In addition to Professor Yasuhiro Tachibana, the research team also includes Professor Joel van Embden of the School of Aerospace, Mechanical and Manufacturing Engineering, Professor Kay Latham of the Bosch and Applied Science Institute. They are all committed to the development of synthetic nanocrystalline alternative materials.

Dr van Embden said: “Given that the initial reaction conditions are not yet known, the synthesis of new nanocrystals is still one of the most challenging tasks.”

He said: "Our focus has been on incorporating elements such as copper and antimony into nanocrystals because these elements are not only very resourceful, but also cost-effective and less toxic."

In research and development, the team has discovered copper-sulphide-sulphide (CAS) colloidal nanocrystals of beryllium copper and eutectic copper.

Both nanocrystals are brownish black and have strong visible and infrared light absorption capabilities, and are suitable as light absorbers in solar cells.

Colloidal nanocrystal solutions (semiconductor nanocrystalline inks) can be easily incorporated into thin nanocrystalline thin film materials.

According to Professor Tachibana, nanocrystalline thin film materials assembled on electrodes can be applied to photovoltaic devices, thin film thermoelectric materials, and transistors, which are less expensive than other methods.

At present, the research team has confirmed that nanocrystalline thin film materials have the potential to generate electricity under the sun's rays.

The American Chemical Society (ACS) was founded in 1876 and has now become one of the world's largest scientific and technological associations, with more than 163,000 members. For many years, ACS has been committed to providing high-quality literature information and services to global chemical research institutions, companies, and individuals, and has become a world-renowned science and technology publisher. ACS journals were rated by the ISI Journal Citation Report (JCR) as the most cited chemical journal in the field of chemistry. In this field, the Journal of the American Chemical Society is the highest ranked journal.

Professor Xinghuo Yu, director of the RMIT platform technology research institute, said that the publication of the paper in a journal with such high influence has fully proved the high level of scientific research achievements of the research team.

Prof Yu added: "The research team is a combination of top scientists and it has a high gold content. It is mainly dedicated to solving complex problems with national and global influence for the industry."

"The scientific research results of this aerospace, mechanical and manufacturing engineering college and applied science cooperation will undoubtedly benefit the entire industry and society." Translator: Krystal

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