과학자들이 반도체를 초전도체로 만든 방법

초전도성 제한

Electricity has been one of the most transformative technologies in history, allowing for the transmission of a very useful form of energy over long distances. But every “normal” electric system faces electric resistance, which results in the generation of heat when an electric current is applied.

An alternative exists: superconductive materials. Superconducting materials have zero electrical resistance, allowing extremely powerful currents to flow without generating heat.

Without superconductivity, plenty of modern technology would not be possible, including particle accelerators (for example, CERN), MRI, and 자기 부상 열차.

Superconductivity will be a crucial component of the most promising megaprojects and technological innovations, like ITER and 핵융합, 매스 드라이버, 양자 컴퓨터, etc.

Zero-loss electric power lines could also be crucial in developing ultra-long grid connections, helping buffer the production of renewables over weather conditions and time zones, solving some of the limitations of solar and wind power.

However, superconductivity has been mastered so far only for materials displaying it at ultra-low temperatures, barely a few degrees above absolute zero. Or extremely high pressure. Or both.

This makes it not only too complex for any but the most demanding applications (maglev, MRI, etc.) as well as very costly, making it uneconomical for many applications that could benefit from superconductive materials for any large-scale use.

초전도성으로 가는 다양한 경로

It now seems that the material produced under high pressure might be able to retain some of its superconductivity at lower pressure 압력-퀜치 프로토콜(PQP)이라는 실험적 방법을 통해.

Recently, WSe₂(텅스텐 셀레늄)의 트위스티드 이중층 appeared to be a good material candidate for higher-temperature superconductors as well.

Another new class of potential superconductors, 이중층 니켈레이트, might have been added to the list this year as well.

Still, all of these materials are relatively new and exotic, making them rather far from mass production and deployment at scale.

This could change, thanks to the discovery that germanium-based semiconductors could be turned into superconductors. This research was done by scientists at the University of Queensland (Australia), New York University, ETH Zürich (Switzerland), and The Ohio State University, who published their findings in Nature Nanotechnology¹, under the title “Superconductivity in substitutional Ga-hyperdoped Ge epitaxial thin films”.

반도체에서 초전도체로

게르마늄 반도체

Germanium and silicon are both so-called Group IV elements, with diamond-like crystal structures. This crystalline structure makes them behave as something between a metal (conductive of electricity) and an insulator (non-conductive), making them useful for semiconductor production.

Germanium semiconductor production is already well understood and performed at scale for various electronic and optical devices. 실제로 다이오드와 트랜지스터에 사용된 최초의 재료 중 하나였으며, 비용이 낮고 열 안정성이 뛰어나 실리콘으로 대체되었습니다.

Today, germanium, which is crucial for electronics and infrared optics, including sensors on missiles and defense satellites, is mostly produced from zinc and molybdenum mines.

To create superconductivity, you need electrons to pair up, letting them move through the material without resistance.

2023년에 이미 게르마늄 필름에서 초전도 상이 발견되었습니다, a work conducted by researchers responsible for this latest discovery, doping gallium material with germanium.

출처: ResearchGate

“이것은 IV족 원소가 정상 조건에서는 자연스럽게 초전도성을 갖지 않지만, 결정 구조를 변형함으로써 전자 짝을 형성해 초전도성을 가능하게 하기 때문입니다.”

Javad Shabani – Director of NYU’s Center of Quantum Information Physics.

확장 가능성

While previous attempts to create superconducting behavior in semiconductors such as germanium and silicon proved the concept, they struggled to build it at scale.

The main issues were to maintain the atomic structure with appropriate conduction properties. Normally, high levels of gallium destabilize the crystal, preventing superconductivity.

Still, this is a promising idea, as germanium semiconductor manufacturing is a very well-understood technology, with plenty of equipment ready to use.

“Germanium is already a workhorse material for advanced semiconductor technologies, so by showing it can also become superconducting under controlled growth conditions there’s now potential for scalable, foundry-ready quantum devices.”

Dr Peter Jacobson – Researcher at University of Queensland

새로운 생산 방법

Most doping methods try to implement the ions into the material, but lead to rather irregular results. While that can be enough to improve semiconductor performance, this is too imprecise to induce superconductivity.

Instead, the researchers used a technique called 분자빔 에피택시 (MBE). 가열된 기판 위에 원자 또는 분자 소스의 빔을 초고진공(UHV) 환경에서 조사합니다.

출처: ExplainThatStuff

This gives precise control over the composition, thickness, and doping of the growing film.

“Rather than ion implantation, molecular beam epitaxy (MBE) was used to precisely incorporate gallium atoms into the germanium’s crystal lattice.

Using epitaxy – growing thin crystal layers – means we can finally achieve the structural precision needed to understand and control how superconductivity emerges in these materials.”

Dr Julian Steele – Researcher at University of Queensland

When using synchrotron-based X-ray absorption, the researchers found that gallium dopants are incorporated within the germanium lattice, introducing a tetragonal distortion to the crystal unit cell.

출처: Nature Nanotechnology

This structural order creates a narrow electronic band for the emergence of superconductivity in Ge.

출처: Nature Nanotechnology

More importantly, this method can work at the wafer-level scale, the same methods used to mass-produce electronics chips.

출처: WaferWorld

“This theoretical work confirmed that gallium atoms substitute neatly into the germanium lattice, creating the electronic conditions for superconductivity.

It’s an elegant example of how computation and experiment together can solve a problem that has challenged materials science for more than half a century.”

Dr Carla Verdi – Researcher at University of Queensland

응용 분야

The superconductivity this method creates is not a room-temperature superconductivity, as it requires temperatures as low as 3.5°K (-269°C / -453°F), a phenomenon still eluding material science.

Still, the ease of its production, using well-established machinery used by the semiconductor industry, could radically change how superconducting chips are made.

In turn, this could radically change how materials for quantum computers are produced. Most likely, instead of expensive superconducting material, a future quantum computer could be just using a “normal” gallium-germanium semiconductor wafer, turned superconducting in specific spots of the chip.

“These materials opens a pathway for a new era of hybrid quantum devices and could underpin future quantum circuits, sensors and low-power cryogenic electronics, all of which need clean interfaces between superconducting and semiconducting regions.”

Dr Peter Jacobson – Researcher at University of Queensland

스와이프하여 스크롤 →

반도체 제조에 투자하기

TSMC

Semiconductor production is an industry dominated by the combination of very niche and complex expertise, and the need to mass-produce at scale to reduce costs.

No company has been as successful at mastering this business model as TSMC, the Taiwanese company leading the world in the manufacturing of ultra-advanced chips.

TSMC produces, of course, mostly silicon chips, including the most powerful 3 and 2nm node chips. And as it produces mostly the most advanced and expensive chips, it controls more than half of the global revenues of the semiconductor foundry industry.

출처: Eric Flaningam

TSMC is today evolving to start producing silicon chips in the US, notably with a massive investment in its new Arizona foundries.

Still, TSMC is also an expert at advanced germanium-based transistors and other semiconductors.

So while the company is mostly driving its current profit from advanced chips and the manufacturing of AI-hardware for the likes of Nvidia (NVDA ), it could also be one of the main beneficiaries of the discovery that common semiconductor manufacturing methods can produce.

최신 TSMC (TSM) 주식 뉴스 및 개발

참조 연구:

^{1. Steele, J.A., Strohbeen, P.J., Verdi, C. et al. Superconductivity in substitutional Ga-hyperdoped Ge epitaxial thin films. Nat. Nanotechnol. (2025). https://doi.org/10.1038/s41565-025-02042-8}