
Researchers (left: Tsuyoshi Michinobu, right: Yang Wang) fabricating thin-film transistors.
CREDIT
Tsuyoshi Michinobu, Yang Wang
Researchers at Tokyo Institute of Technology (Tokyo Tech) report a unipolar n-type transistor with a world-leading electron mobility performance of up to 7.16 cm2 V-1 s-1. This achievement heralds an exciting future for organic electronics, including the development of innovative flexible displays and wearable technologies.
Researchers worldwide are on the hunt for novel materials that can improve the performance of basic components required to develop organic electronics.
Now, a research team at Tokyo Tech’s Department of Materials Science and Engineering including Tsuyoshi Michinobu and Yang Wang report a way of increasing the electron mobility of semiconducting polymers, which have previously proven difficult to optimize. Their high-performance material achieves an electron mobility of 7.16 cm2 V-1 s-1, representing more than a 40 percent increase over previous comparable results.
In their study published in theĀ Journal of the American Chemical Society, they focused on enhancing the performance of materials known as n-type semiconducting polymers. These n-type (negative) materials are electron dominant, in contrast to p-type (positive) materials that are hole dominant. “As negatively-charged radicals are intrinsically unstable compared to those that are positively charged, producing stable n-type semiconducting polymers has been a major challenge in organic electronics,” Michinobu explains.
The research therefore addresses both a fundamental challenge and a practical need. Wang notes that many organic solar cells, for example, are made from p-type semiconducting polymers and n-type fullerene derivatives. The drawback is that the latter are costly, difficult to synthesize and incompatible with flexible devices. “To overcome these disadvantages,” he says, “high-performance n-type semiconducting polymers are highly desired to advance research on all-polymer solar cells.”
The team’s method involved using a series of new poly(benzothiadiazole-naphthalenediimide) derivatives and fine-tuning the material’s backbone conformation. This was made possible by the introduction of vinylene bridges[1] capable of forming hydrogen bonds with neighboring fluorine and oxygen atoms. Introducing these vinylene bridges required a technical feat so as to optimize the reaction conditions.
Overall, the resultant material had an improved molecular packaging order and greater strength, which contributed to the increased electron mobility.
Using techniques such as grazing-incidence wide-angle X-ray scattering (GIWAXS), the researchers confirmed that they achieved an extremely short ?-? stacking distance[2] of only 3.40 angstrom. “This value is among the shortest for high mobility organic semiconducting polymers,” says Michinobu.
There are several remaining challenges. “We need to further optimize the backbone structure,” he continues. “At the same time, side chain groups also play a significant role in determining the crystallinity and packing orientation of semiconducting polymers. We still have room for improvement.”
Wang points out that the lowest unoccupied molecular orbital (LUMO) levels were located at -3.8 to -3.9 eV for the reported polymers. “As deeper LUMO levels lead to faster and more stable electron transport, further designs that introduce sp2-N, fluorine and chlorine atoms, for example, could help achieve even deeper LUMO levels,” he says.
In future, the researchers will also aim to improve the air stability of n-channel transistors — a crucial issue for realizing practical applications that would include complementary metal-oxide-semiconductor (CMOS)-like logic circuits, all-polymer solar cells, organic photodetectors and organic thermoelectrics.
Learn more: Organic electronics: Scientists develop a high-performance unipolar n-type thin-film transistor
The Latest on: Organic electronics
[google_news title=”” keyword=”organic electronics” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Organic electronics
- Organic Fruits and Vegetables Market: Trends Shaping the Future 2023-2028on March 26, 2023 at 4:11 am
Beijing Ouge organic farms Electronics Development Co. Shandong Longli Biotechnology Co., Ltd. Taian Taishan Asia Food Co., Ltd Heilongjiang Agriculture Co., Ltd. BOBC (Beijing) Agricultural ...
- Organic Electronics Market Size 2023 With Presentation Outlook, Horizontal Viewpoint, Global Viewon March 23, 2023 at 2:12 am
Organic Electronics Market Size 2023-2030 | New Report (81 Pages) | In This Reports Organic Electronics Market and ...
- Molecular teamwork makes the organic dream workon March 22, 2023 at 1:31 am
Molecular engineers have triggered a domino-like structural transition in an organic semiconductor. The energy- and time-saving phenomenon may enhance the performance of smartwatches, solar cells, and ...
- Better electronics: scientists get semiconductors to cooperateon March 21, 2023 at 6:10 am
Researchers discovered a way to trigger cooperative behavior in organic semiconductors that may help enhance the performance of smartwatches, solar cells, and other organic electronics.
- Molecular teamwork makes the organic dream workon March 21, 2023 at 3:03 am
The energy- and time-saving phenomenon may help enhance the performance of smartwatches, solar cells, and other organic electronics. Their work was accepted for publication in Nature Communications.
- Semiconductor crystals: Molecular teamwork makes the organic dream workon March 21, 2023 at 3:01 am
The energy- and time-saving phenomenon may help enhance the performance of smartwatches, solar cells, and other organic electronics. Their work was accepted for publication in Nature Communications.
- Molecular Teamwork To Boost Performance of Smartwatches and Solar Cellson March 21, 2023 at 3:00 am
Cooperativity in organic semiconductors may enhance the performance of smartwatches, solar cells, and other organic electronics. The virus responsible for E. coli infection has a secret weapon: ...
- Organic Materials Used For Cost-Efficient Fuel Cellon March 10, 2023 at 4:00 pm
Researchers from the University of Wisconsin (UW) Madison aimed to solve the problems associated with this technology with a bio-inspired fuel-cell design that uses less expensive materials and an ...
- Organic Electronics: Ingredients For Innovationon April 29, 2020 at 4:01 am
VP of manufacturing, technology and Innovation at Jabil. Over 20 years of experience helping global teams create cutting-edge manufacturing . Today, the word "organic" is used to describe ...
- A New Breakthrough Could Make Organic Electronics Far More Efficienton November 19, 2017 at 9:38 am
There is a growing field within the technological sector — organic electronics. This concept blends organic materials with advancing technologies to create increased capabilities and unique ...
via Bing News