Bielefeld, Germany – A team of physicists at Bielefeld University has achieved a significant breakthrough in semiconductor technology, demonstrating the ability to control ultrathin materials using pulses of terahertz light. This innovation, detailed in a study published in Nature Communications, positions Germany to potentially recapture a leading role in the global semiconductor industry, currently valued at over €1 trillion, and could revolutionize the speed and efficiency of optoelectronic devices.
The development addresses a critical bottleneck in current semiconductor technology: the speed limitations of traditional electronic gating. Instead of relying on electrical contacts to switch transistors and other electronic devices, researchers have harnessed terahertz radiation – positioned in the electromagnetic spectrum between infrared and microwaves – to directly manipulate the electronic properties of materials like molybdenum disulfide (MoS₂). This approach promises to unlock a novel generation of components controlled at unprecedented speeds, directly by light.
Central to the breakthrough is the design of nanoscale antennas that convert terahertz light into strong vertical electric fields within the atomically thin semiconductors. According to the research, these electric fields can reach strengths of several megavolts per centimeter. “Traditionally, such vertical electric fields…are applied using electronic gating, but this method is fundamentally limited to relatively slow response times,” explained Professor Dr. Dmitry Turchinovich of Bielefeld University, the project leader. “Our approach uses the terahertz light itself to generate the control signal within the semiconductor material – allowing an industry-compatible, light-driven, ultrafast optoelectronic technology that was not possible until now.”
Terahertz Control: A New Paradigm for Semiconductors
The technique allows for real-time control of the electronic structure on timescales of less than a picosecond – one trillionth of a second. Researchers experimentally demonstrated the selective alteration of the material’s optical and electronic properties using these light pulses. This level of control opens doors for advancements in various fields, including data transmission, camera technology, and laser systems. The research builds on previous work in the field, as detailed by Quantum Zeitgeist, highlighting the collaborative effort between Bielefeld University and the Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden).
The implications of this technology extend beyond simply increasing speed. Traditional electronic gating methods generate heat, which limits performance and requires complex cooling systems. Light-driven control, in contrast, offers the potential for more energy-efficient and compact devices. Here’s particularly crucial as the demand for semiconductors continues to grow across industries, from consumer electronics to automotive and defense.
Germany’s Push to Reclaim Semiconductor Leadership
Germany’s renewed focus on semiconductor innovation comes as global competition intensifies. The semiconductor industry is currently dominated by companies in the United States, Taiwan, and South Korea. According to Beacon Wales, this breakthrough represents a significant step in Germany’s efforts to regain a foothold in the €1 trillion chip market. The European Union has also announced ambitious plans to increase its share of global semiconductor production to 20% by 2030, a goal known as the European Chips Act.
The development at Bielefeld University aligns with broader European initiatives to bolster domestic semiconductor capabilities and reduce reliance on foreign suppliers. The European Chips Act aims to mobilize over €43 billion in public and private investments to strengthen research, innovation, and production capacity across the EU. This includes funding for advanced technologies like those being developed in Bielefeld, which could be instrumental in achieving the EU’s ambitious goals.
What’s Next for Light-Powered Semiconductors?
Even as the research represents a major advancement, scaling up the technology for mass production presents significant challenges. Further research will focus on optimizing the nanoscale antennas and developing efficient terahertz light sources. The team is also exploring the application of this technique to other two-dimensional materials beyond molybdenum disulfide. The next steps involve refining the process for industrial applications and exploring potential partnerships with semiconductor manufacturers. The successful translation of this laboratory breakthrough into commercially viable products will be crucial for Germany and Europe to compete effectively in the global semiconductor landscape.
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