In one of the biggest advancements in fundamental transistor design, Intel this weekend revealed that it is using two dramatically new materials to build the insulating walls and switching gates of its 45 nanometer (nm) transistors. Hundreds of millions of these microscopic transistors – or switches – will be inside the next generation Intel Core 2 Duo, Intel Core 2 Quad and Xeon families of multi-core processors.
The company has also unveiled five early-version products up and running — the first of fifteen 45nm processor products, codenamed Penryn, planned.
The transistor feat allows the company to continue delivering record-breaking PC, laptop and server processor speeds, while reducing the amount of electrical leakage from transistors that can hamper chip and PC design, size, power consumption, noise and costs. It also ensures Moore’s Law, a high-tech industry axiom that transistor counts double about every two years, thrives into the next decade.
The early versions of the new chips, which will be targeted at five different computer market segments, are running Windows Vista, Mac OS X, Windows XP and Linux operating systems, as well as various applications. The company remains on track for 45nm production in the second half of this year.
Intel is the first to implement an innovative combination of new materials that drastically reduces transistor leakage and increases performance in its 45nm process technology. The company will use a new material with a property called high-k, for the transistor gate dielectric, and a new combination of metal materials for the transistor gate electrode.
“The implementation of high-k and metal materials marks the biggest change in transistor technology since the introduction of polysilicon gate MOS transistors in the late 1960s,” says Intel co-founder Gordon Moore.
“As more and more transistors are packed on to a single piece of silicon, the industry continues to research current leakage reduction solutions,” says Mark Bohr, senior fellow at Intel. “Meanwhile our engineers and designers have achieved a remarkable accomplishment that ensures the leadership of Intel products and innovation. Our implementation of novel high-k and metal gate transistors for our 45nm process technology will help Intel deliver even faster, more energy-efficient multi-core products that build upon our successful Intel Core 2 and Xeon family of processors, and extend Moore’s Law well into the next decade.”
As the number of transistors on a chip roughly doubles every two years in accordance with Moore’s Law, transistors must continue to shrink to ever-smaller sizes. However, using current materials, the ability to shrink transistors is reaching fundamental limits because of increased power and heat issues that develop as feature sizes reach atomic levels. As a result, implementing new materials is imperative to the future of Moore’s Law and the economics of the information age.
Silicon dioxide has been used to make the transistor gate dielectric for more than 40 years because of its manufacturability and ability to deliver continued transistor performance improvements as it has been made ever thinner. Intel has successfully shrunk the silicon dioxide gate dielectric to as little as 1,2nm thick – equal to five atomic layers – on previous 65nm process technology. But the continued shrinking has led to increased current leakage through the gate dielectric, resulting in wasted electric current and unnecessary heat.
To solve this critical issue, Intel replaced the silicon dioxide with a thicker hafnium-based high-k material in the gate dielectric, reducing leakage by more than 10 times.
Because the high-k gate dielectric is not compatible with today’s silicon gate electrode, the second part of Intel’s 45nm transistor material recipe is the development of new metal gate materials. While the specific metals that Intel uses remains secret, the company will use a combination of different metal materials for the transistor gate electrodes.
The combination of the high-k gate dielectric with the metal gate for Intel’s 45nm process technology provides a more than 20% increase in drive current, or higher transistor performance. Conversely, it reduces source-drain leakage by more than five times, thus improving the energy efficiency of the transistor.
Intel’s 45nm process technology also improves transistor density by approximately two times that of the previous generation, allowing the company to either increase the overall transistor count or to make processors smaller. Because the 45nm transistors are smaller than the previous generation, they take less energy to switch on and off, reducing active switching power by about 30%.
Intel will use copper wires with a low-k dielectric for its 45nm interconnects for increased performance and lower power consumption. It will also use innovative design rules and advanced mask techniques to extend the use of 193nm dry lithography to manufacture its 45nm processors because of the cost advantages and high manufacturability it affords.
The Penryn family of processors is a derivative of the Intel Core microarchitecture and marks the next step in Intel’s delivery of new process technology and new microarchitecture every other year.
The company has more than 15 products based on 45nm in development across desktop, mobile, workstation and enterprise segments. With more than 400-million transistors for dual-core processors and more than 800-million for quad-core, the Penryn family of 45nm processors includes new microarchitecture features for greater performance and power management capabilities, as well as higher core speeds and up to 12Mb of cache.
The Penryn family designs also bring approximately 50 new Intel SSE4 instructions that expand capabilities and performance for media and high-performance computing applications.