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Exploring soft semiconductors for solar power

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International collaboration to investigate soft materials for harvesting, storing and transferring energy

An international research collaboration is working to find a solution by optimising solar power using organic, soft electronic materials as semiconductors.

Madalina Furis and researchers at the University of Oklahoma's Center for Quantum Research and Technology will collaborate with the University of Vermont and Yamagata University and Osaka University in Japan to investigate harvesting, storing and transferring energy in soft electronic materials.

The three-year study is the focus of a $1.5 million grant from the US National Science Foundation’s Partnership for International Research and Education, or PIRE, program.

The partnership will bring the researchers access to Japan’s soft materials and optoelectronic device fabrication and characterisation facilities and foster connections with semiconductor industries of the future, enabling rapid progress for the future generation of soft electronic materials.

“Photovoltaics is, of course, a major strategic area of interest for the United States because it is an area of research focused on harvesting sunlight – the sun’s energy – in order to gain freedom from sources of energy that have a limited lifetime,” Furis said. “Because we’re talking about harvesting light and radiation from the sun, the optical properties of the semiconductors – their ability to absorb sunlight and eventually convert it into electricity – is central to this whole endeavour.”

The research team includes specialists in photovoltaics, as well as experts in how energy is transported or moves through devices and experts in device fabrication.

Furis said traditionally when people hear about soft matter, they don’t necessarily think of the semiconductor industry. “They think more of things like polymers, aero gels; they don’t really think of electronic applications necessarily, although, of course, we have one shining example – the organic light-emitting diode in OLED TV that’s essentially made with soft matter,” she said. “The semiconductors that are inside of those light-emitting diodes are carbon-based molecular semiconductors.”

Furis said her team is working to understand the properties of these types of organic, soft-matter semiconductors to make photovoltaics more efficient, but also to extend the value of the materials for other types of applications that go beyond their traditional use, such as wearable medical devices. For example, wearable long-term diagnostic devices that are smaller, more efficient and less invasive for the patient may lead to a better understanding of the onset and evolution of chronic diseases.

“It could revolutionise the whole medical industry, the way we deliver health care to people. We could essentially cheaply monitor vital signs, and without any disturbance to people,” she said. “Many of these molecules, some that are hardly studied, are entirely compatible with the human physiology.”

The technology could also allow devices that can switch from one molecule to another affordably, or even use a mix of compatible molecules.

“I often hear colleagues saying that now there is a search for the one small molecule that will be the silicon of organic electronics. We think this approach does not take advantage of the large versatility and diversity of carbon-based semiconductors,” Furis said. “Our vision is that, ultimately, we will have a set of small molecules, compatible with the same technological process flow. One of them will be best suited for the transistors on an all-carbon chip, while the other might offer superior performance for its integrated photovoltaic source.”

Furis said the partnership between the U.S.-based team and Japan-based collaborators spans all aspects of synthesis; prototyping; thin-film growth; and structural, electrical and spectroscopic characterisation. Yamagata University is one of the largest places in Japan dedicated to organic electronics, and the partnership will allow the research team to put their vision of making new materials to the test.

The project is one of 13 new PIRE awards funded by the National Science Foundation totaling more than $19 million. The PIRE competition focuses on global societal challenges related to climate change and clean energy.

Pictured above: Furis and Yamagata University graduate student Sun He are aligning the HORIBA spectrofluorometer for low temperature photoluminescence excitation experiments on small molecule semiconductors in the Yoshida lab.

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