Chirality in Electronics: A Key to Controlling Electron Movement

Their semiconductor emits circularly polarized light, indicating the “handedness” of electrons. Unlike traditional inorganic semiconductors like silicon, which have symmetrical internal structures allowing electrons to move without preference, this material introduces directionality.

Figure 1. Spinning Electrons Unlock a Semiconductor Breakthrough.

In nature, many molecules exhibit chirality—existing in left- or right-handed forms, much like human hands. Chirality plays a vital role in biological processes such as DNA formation, yet harnessing it in electronic materials has long been a challenge. Figure 1 shows Spinning Electrons Unlock a Semiconductor Breakthrough.

Nature-Inspired Molecular Design

By drawing inspiration from nature, the researchers engineered a chiral semiconductor by guiding stacks of semiconducting molecules into ordered right-handed or left-handed spiral columns. Their findings, published in science, mark a breakthrough in molecular design.

One promising application for chiral semiconductors lies in display technology. Traditional screens lose a significant amount of energy due to inefficient light filtering. However, this new semiconductor naturally emits light in a way that minimizes these losses, potentially leading to brighter, more energy-efficient displays.

Reimagining Semiconductor Flexibility

“When I first began working with organic semiconductors, many doubted their potential, yet today 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 provide remarkable flexibility—enabling the creation of entirely new structures, such as chiral LEDs. It’s like building with a limitless Lego set, where every imaginable shape is possible, rather than just standard rectangular bricks.”

A Self-Assembling, Light-Emitting Breakthrough

The semiconductor is built on triazatruxene (TAT), a material that naturally self-assembles into a helical stack, enabling 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 polarization—an effect that has been challenging to achieve in semiconductors until now,” said co-first author Marco Preuss from Eindhoven University of Technology. “TAT’s structure not only allows electrons to move efficiently but also influences how light is emitted.”

The Future of OLEDs is Circular

By refining OLED fabrication techniques, the researchers successfully integrated TAT into functional circularly polarized OLEDs (CP-OLEDs). These devices set new benchmarks in efficiency, brightness, and polarization levels, making them the most advanced of their kind.

“We’ve essentially reworked the standard OLED manufacturing process—like those used in our smartphones—to trap a chiral structure within a stable, non-crystallizing matrix,” said co-first author Rituparno Chowdhury from Cambridge’s Cavendish Laboratory. “This offers a practical way to produce circularly polarized LEDs, a long-standing challenge in the field.”

Decades of Research Lead to a Breakthrough

This achievement stems from a decades-long collaboration between Professor Sir Richard Friend’s research group and Professor Bert Meijer’s team at Eindhoven University of Technology. “This is a real breakthrough in creating a chiral semiconductor,” said Meijer. “By carefully designing the molecular structure, we’ve successfully linked the chirality of the material to electron motion—something never achieved at this level before.”

Chiral semiconductors mark a significant advancement in organic semiconductor technology, which now powers a $60 billion industry. Beyond displays, this discovery holds promise for quantum computing and spintronics—a field that leverages electron spin to store and process data, potentially enabling faster and more secure computing systems.

Source: SciTECHDaily

Cite this article:

Priyadharshini S (2025),"Spinning Electrons Unravel a Long-Standing Semiconductor Mystery", AnaTechMaz, pp. 222