The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
Argonne National Laboratory

Research Plumbs the Molecular Building Blocks for Light-Responsive Materials

16-Mar-2021 11:55 AM EDT, by Argonne National Laboratory

Newswise — New studies co-led by researchers at Argonne National Laboratory shed light on organic frameworks for advanced solar cells and detectors.

Creating the next generation of solar cells and sensors requires a close look at how light interacts with light-responsive materials. Research at the U.S. Department of Energy’s (DOE) Argonne National Laboratory is advancing this understanding toward a future with flexible, highly efficient solar cells and cutting-edge optical tools.

To design new technologies that harness light using organic materials, scientists are exploring the basic molecular functions at play. For example, the use of specially designed carbon-based components could enable flexible, thin-film solar cells, or photovoltaics. This type of material could enable everything from tinted power-generating windows to portable chargers, expanding solar energy far beyond traditional, silicon-based roof panels. However, much remains to be discovered about which building blocks for these organic photovoltaics will deliver high efficiency, durability and low cost.

In some ways, photovoltaics today are like the early auto industry,” said Richard Schaller, a physical chemist at Argonne and professor at Northwestern University. ​A dozen or more different engineering and materials approaches all aim to utilize solar energy, but they target multiple identified markets, as well as respond to different cost and performance drivers.”

Such materials span thick, high-purity crystalline inorganics like silicon to low-cost, much thinner organic plastics and small molecules that need less initial energy input to fabricate.

In some ways, photovoltaics today are like the early auto industry. A dozen or more different engineering and materials approaches all aim to utilize solar energy.” — Richard Schaller, Argonne physical chemist

The heart of organic solar cells is composed of separate regions known as electron donors and electron acceptors. When photons from sunlight hit these regions, the photons deposit energy into negatively charged electrons, which are excited and produce positively charged holes where the electrons were. These electron-hole pairs stick together due to their opposite charge and are called excitons. When excitons meet the interface between donor and acceptor, they can split, facilitating the separate transfer of electrons moving toward one electrode and holes toward the other, generating a current.

Spherical, hollow carbon molecules known as fullerenes make great acceptors within a cell, but fullerenes have drawbacks, said Lin Chen, a Distinguished Fellow at Argonne and chemistry professor at Northwestern University.

Fullerene is hard to synthesize, and more expensive by weight than gold,” she said. ​It’s been an ongoing process to find non-fullerene acceptors that are cost-effective and robust for long-lasting organic solar cells.”

Chen, Schaller and colleagues are studying perylenediimide (PDI) derivatives, which are potential alternatives to fullerenes based on a class of inexpensive pigments. In a recent study, the researchers examined six variations of PDIs synthesized by Luping Yu, a study co-author and chemistry professor at the University of Chicago, and his colleagues. The goal was to see how changes in molecular structure affected the PDIs’ light-converting efficiency.

These PDI molecules are linked together into pairs called dimers to enhance their electronic communications with donor materials. The study compared activities among these dimers with linkers of different length and rigidity. The research, which was published in the journal Chemical Science in June, 2020, combined experimental and theoretical expertise among the collaborators to assemble the most comprehensive characterization yet of different PDI structures for photovoltaics.

On the experimental side, researchers examined the dimers with ultrafast emission and transient absorption spectroscopy to measure in real time the dynamics of exciton generation, evolution and decay. These optical studies, which help sensitively track exciton activity by recording different spectra of light as the photons are absorbed or emitted by the material, were conducted at Argonne’s Center for Nanoscale Materials (CNM), a DOE Office of Science User Facility.

The time-resolved light measurements were validated via comprehensive calculations by George Schatz, study co-author and a chemistry professor at Northwestern University, who together with colleagues examined the structural dependence of energy levels in these molecules, such as how the linker between two PDIs modifies the density of the electron flow between them.

In a separate study, Chen, Schaller and colleagues evaluated the exciton activity of assembled molecules known as two-dimensional covalent organic frameworks, or 2D COFs, designed by study co-author William Dichtel and colleagues at Northwestern University. COFs have potential for use in light-emitting diodes, chemical sensors and photovoltaics — their geometric precision lends itself to efficient energy transport. But little is known about how electrons actually behave in these emerging materials.

2D COFs resemble snowflakes that can be stacked or linked to create an electron-transporting network. As they join together, their properties change, and the researchers wanted to know why. They inspected these crystalline structures, again using transient absorption spectroscopy at Northwestern University and the CNM and also the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) beamline at the Advanced Photon Source, a DOE Office of Science User Facility at Argonne.

Powder scatters light to an extent that makes it difficult to characterize with spectroscopy. To get around this problem, the researchers created a colloidal solution of COFs, allowing for photophysical characterization that wouldn’t have been possible otherwise.

Colloidal COFs are at a pretty early stage,” Schaller said. ​In the past, they’ve only been made as solid powders, and so even just studying their properties has been a challenge that William Dichtel has been able to break open.”

Spectroscopy was used to gauge electron activity, while the DND-CAT beamline helped measure the size and molecular packing of the COFs’ crystalline domain.

We discovered a very high mobility of excitons in the 2D COFs, which was unexpected,” Chen said. ​The findings reinforce these structures’ promise for potential opto-electronic applications.”

The team’s results are detailed in the paper ​Large exciton diffusion coefficients in two-dimensional covalent organic frameworks with different domain sizes revealed by ultrafast exciton dynamics,” which was published last July in the Journal of the American Chemical Society. The work was funded in part by DOE’s Office of Science and the U.S. Army Research Office’s Multidisciplinary University Research Initiative.  Co-authors with Chen and Schaller are Nathan C. Flanders, Matthew S. Kirschner, Pyosang Kim, Thomas J. Fauvell, Austin M. Evans, Waleed Helweh, Austin P. Spencer and William R. Dichtel at Northwestern University.

The Chemical Science paper on PDIs, ​Photophysical implications of ring fusion, linker length, and twisting angle in a series of perylenediimide–thienoacene dimers,” was supported by DOE’s Office of Basic Energy Sciences and Northwestern University. Co-authors with Chen and Schaller are Ariel A. Leonard, Martín A. Mosquera, Leighton O. Jones, Thomas J. Fauvell, Matthew S. Kirschner, and George C. Schatz at Northwestern University; David J. Gosztola at Argonne; Zhengxu Cai at the Beijing Institute of Technology; and Luping Yu at the University of Chicago.

About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://​sci​ence​.osti​.gov/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​-​a​t​-​a​-​G​lance.

About the Advanced Photon Source

The U. S. Department of Energy Office of Science’s Advanced Photon Source (APS) at Argonne National Laboratory is one of the world’s most productive X-ray light source facilities. The APS provides high-brightness X-ray beams to a diverse community of researchers in materials science, chemistry, condensed matter physics, the life and environmental sciences, and applied research. These X-rays are ideally suited for explorations of materials and biological structures; elemental distribution; chemical, magnetic, electronic states; and a wide range of technologically important engineering systems from batteries to fuel injector sprays, all of which are the foundations of our nation’s economic, technological, and physical well-being. Each year, more than 5,000 researchers use the APS to produce over 2,000 publications detailing impactful discoveries, and solve more vital biological protein structures than users of any other X-ray light source research facility. APS scientists and engineers innovate technology that is at the heart of advancing accelerator and light-source operations. This includes the insertion devices that produce extreme-brightness X-rays prized by researchers, lenses that focus the X-rays down to a few nanometers, instrumentation that maximizes the way the X-rays interact with samples being studied, and software that gathers and manages the massive quantity of data resulting from discovery research at the APS.

This research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science.

The U.S. Department of Energy’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit https://​ener​gy​.gov/​s​c​ience.

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Fri, 15 Jun 2018 09:00:41 EST

Professor Emily Liu Receives $1.8 Million DoE Award for Solar Power Systems Research

Rensselaer Polytechnic Institute (RPI)

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