̽��ֱ�� of Cambridge - Fitzwilliam College

Hundreds of A-level students see grades rise and secure places at top universities following Cambridge's STEM SMART initiative

sb726 — Mon, 07 Apr 2025 07:30:17 +0000

UCAS evaluation shows the most engaged sixth formers saw their results jump by a grade on average, were up to four times as successful in achieving an A*, and around twice as successful in securing an Oxbridge place.

10 Cambridge AI spinouts

skbf2 — Wed, 02 Apr 2025 15:20:09 +0000

Meet 10 Cambridge spinouts, all hoping to harness the potential of AI for the good of the planet and its people.

Spinning, twisted light could power next-generation electronics

sc604 — Thu, 13 Mar 2025 18:09:28 +0000

̽��ֱ��researchers, led by the ̽��ֱ�� of Cambridge and the Eindhoven ̽��ֱ�� of Technology, have created an organic semiconductor that forces electrons to move in a spiral pattern, which could improve the efficiency of OLED displays in television and smartphone screens, or power next-generation computing technologies such as spintronics and quantum computing.

̽��ֱ��semiconductor they developed emits circularly polarised light—meaning the light carries information about the ‘handedness’ of electrons. ̽��ֱ��internal structure of most inorganic semiconductors, like silicon, is symmetrical, meaning electrons move through them without any preferred direction.

However, in nature, molecules often have a chiral (left- or right-handed) structure: like human hands, chiral molecules are mirror images of one another. Chirality plays an important role in biological processes like DNA formation, but it is a difficult phenomenon to harness and control in electronics.

But by using molecular design tricks inspired by nature, the researchers created a chiral semiconductor by nudging stacks of semiconducting molecules to form ordered right-handed or left-handed spiral columns. Their results are reported in the journal Science.

One promising application for chiral semiconductors is in display technology. Current displays often waste a significant amount of energy due to the way screens filter light. ̽��ֱ��chiral semiconductor developed by the researchers naturally emits light in a way that could reduce these losses, making screens brighter and more energy-efficient.

“When I started working with organic semiconductors, many people doubted their potential, but now they dominate display technology,” said Professor Sir Richard Friend from Cambridge’s Cavendish Laboratory, who co-led the research. “Unlike rigid inorganic semiconductors, molecular materials offer incredible flexibility—allowing us to design entirely new structures, like chiral LEDs. It’s like working with a Lego set with every kind of shape you can imagine, rather than just rectangular bricks.”

̽��ֱ��semiconductor is based on a material called triazatruxene (TAT) that self-assembles into a helical stack, allowing electrons to spiral along its structure, like the thread of a screw.

“When excited by blue or ultraviolet light, self-assembled TAT emits bright green light with strong circular polarisation—an effect that has been difficult to achieve in semiconductors until now,” said co-first author Marco Preuss, from the Eindhoven ̽��ֱ�� of Technology. “ ̽��ֱ��structure of TAT allows electrons to move efficiently while affecting how light is emitted.”

By modifying OLED fabrication techniques, the researchers successfully incorporated TAT into working circularly polarised OLEDs (CP-OLEDs). These devices showed record-breaking efficiency, brightness, and polarisation levels, making them the best of their kind.

“We’ve essentially reworked the standard recipe for making OLEDs like we have in our smartphones, allowing us to trap a chiral structure within a stable, non-crystallising matrix,” said co-first author Rituparno Chowdhury, from Cambridge’s Cavendish Laboratory. “This provides a practical way to create circularly polarised LEDs, something that has long eluded the field.”

̽��ֱ��work is part of a decades-long collaboration between Friend’s research group and the group of Professor Bert Meijer from the Eindhoven ̽��ֱ�� of Technology. “This is a real breakthrough in making a chiral semiconductor,” said Meijer. “By carefully designing the molecular structure, we’ve coupled the chirality of the structure to the motion of the electrons and that’s never been done at this level before.”

̽��ֱ��chiral semiconductors represent a step forward in the world of organic semiconductors, which now support an industry worth over $60 billion (about £45 billion). Beyond displays, this development also has implications for quantum computing and spintronics—a field of research that uses the spin, or inherent angular momentum, of electrons to store and process information, potentially leading to faster and more secure computing systems.

̽��ֱ��research was supported in part by the European Union’s Marie Curie Training Network and the European Research Council. Richard Friend is a Fellow of St John’s College, Cambridge. Rituparno Chowdhury is a member of Fitzwilliam College, Cambridge.

Reference

Rituparno Chowdhury, Marco D Preuss et al. ‘Circularly polarized electroluminescence from chiral supramolecular semiconductor thin films.’ Science (2025). DOI:10.1126/science.adt3011

Researchers have advanced a decades-old challenge in the field of organic semiconductors, opening new possibilities for the future of electronics.

It’s like working with a Lego set with every kind of shape you can imagine, rather than just rectangular bricks

Richard Friend

Samarpita Sen, Rituparno Chowdhury

Confocal microscopy image of a chiral semiconductor

̽��ֱ��text in this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Images, including our videos, are Copyright © ̽��ֱ�� of Cambridge and licensors/contributors as identified. All rights reserved. We make our image and video content available in a number of ways – on our main website under its Terms and conditions, and on a range of channels including social media that permit your use and sharing of our content under their respective Terms.

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̽��ֱ��Cambridge Awards 2024 for Research Impact and Engagement

zs332 — Mon, 03 Feb 2025 10:27:01 +0000

Meet the winner of the Cambridge Awards 2024 for Research Impact and Engagement and learn more about their projects.

New long-term collaboration with Suzano begins with a £10 million donation to support conservation and sustainability education and research

plc32 — Fri, 15 Nov 2024 16:05:37 +0000

An initial £10 million donation will be used to support education and research into areas including the conservation of biodiversity, enhancing business sustainability, and the restoration of natural habitats in Brazil and beyond. ̽��ֱ��agreement will establish the Suzano Scholars Fund, a perpetual endowment at Jesus College to fund Brazilian nationals studying for a postgraduate degree at the ̽��ֱ�� of Cambridge connected to the environment, ecology and conservation, educating the next generation of sustainability experts and leaders. Funding will also be provided to academics based at the Conservation Research Institute to undertake research projects exploring the interaction between human and natural systems in areas such as biodiversity, climate change, water resource management, and ecosystem restoration. Read more about this new initiative here

Suzano, one the world’s largest producers of bio-based raw materials, based in São Paulo, Brazil, establishes a long-term initiative with Jesus College and the ̽��ֱ�� of Cambridge.

This visionary initiative will help to build strong links between the ̽��ֱ�� of Cambridge and Brazil

Professor Bhaskar Vira

Suzano

Green forests stretch out to the horizon

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New PhD funding programme launched

ps748 — Mon, 11 Nov 2024 12:17:11 +0000

Trinity College and the ̽��ֱ�� of Cambridge’s new £48 million programme enabling fully-funded PhDs has been launched.

Cambridge is forging a future for our planet

lw355 — Mon, 21 Oct 2024 09:00:36 +0000

Find out how Cambridge's pioneering research in climate and nature is regenerating nature, rewiring energy, rethinking transport and redefining economics – forging a future for our planet.

Changemakers: Bhaskar Vira, Pro-Vice-Chancellor for Education and Environmental Sustainability

lw355 — Mon, 21 Oct 2024 08:50:53 +0000

Economist, researcher and educator, Bhaskar Vira is keeping faith with a life-long love for the natural world and a determination to tackle the climate and nature crises.