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A step towards keeping up with Moore's Law

Researchers develop a novel and efficient fabrication technology for cross-shaped memristor

Date:
January 28, 2016
Source:
Pohang University of Science & Technology (POSTECH)
Summary:
Scientists have developed a rapid printing technology for high density and scalable memristor array composed of cross-bar-shaped metal nanowires. This technology will be used as a source technology to realize smart fabric, wearable computers, and textile electronic devices as it reduces lead time and cost remarkably compared with existing manufacturing methods.
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Along with the fast development of modern information technology, charge-based memories, such as DRAM and flash memory, are being aggressively scaled down to meet the current trend of small size devices. A memory device with high density, faster speed, and low power consumption is desired to satisfy Moore's law in the next few decades. Among the candidates of next-generation memory devices, cross-bar-shaped non-volatile resistive memory (memristor) is one of the most attractive solutions for its non-volatility, faster access speed, ultra-high density and easier fabrication process.

Conventional memristors are usually fabricated through conventional optical, imprint, and e-beam lithographic approaches. However, to meet Moore's law, the assembly of memristors composed of 1-dimensional (1D) nanowires must be demonstrated to achieve cell dimensions beyond limit of state-of-art lithographic techniques, thus allowing one to fully exploit the scaling potential of high density memory array.

Prof. Tae-Woo Lee (Dept. of Materials Science and Engineering) and his research team have developed a rapid printing technology for high density and scalable memristor array composed of cross-bar-shaped metal nanowires. The research team, which consists of Prof. Tae-Woo Lee, research professor Wentao Xu, and doctoral student Yeongjun Lee at POSTECH, Korea, published their findings in Advanced Materials.

They applied an emerging technique, electrohydrohynamic nanowire printing (e-NW printing), which directly prints highly-aligned nanowire array on a large scale into the fabrication of microminiature memristors, with cross-bar-shaped conductive Cu nanowires jointed with a nanometer-scale CuxO layer. The metal-oxide-metal structure resistive memory device exhibited excellent electrical performance with reproducible resistive switching behavior.

This simple and fast fabrication process avoids conventional vacuum techniques to significantly reduce the industrial-production cost and time. This method paved the way to the future down-scaling of electronic circuits, since 1D conductors represent a logical way to extreme scaling of data processing devices in the single-digit nanometer scale.

They also succeeded in printing memristor array with various shapes, such as parallel lines with adjustable pitch, grids, and waves which can offer a future stretchable memory for integration into textile to serve as a basic building block for smart fabrics and wearable electronics.

"This technology reduces lead time and cost remarkably compared with existing manufacturing methods of cross-bar-shaped nanowire memory and simplifies its method of construction," said Prof. Lee. "In particular, this technology will be used as a source technology to realize smart fabric, wearable computers, and textile electronic devices."

This work was supported by the Center for Advanced Soft-Electronics as Global Frontier Project and the Pioneer Research Center Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT and Future Planning.


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The above post is reprinted from materials provided by Pohang University of Science & Technology (POSTECH). Note: Content may be edited for style and length.


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Pohang University of Science & Technology (POSTECH). "A step towards keeping up with Moore's Law: Researchers develop a novel and efficient fabrication technology for cross-shaped memristor." ScienceDaily. ScienceDaily, 28 January 2016. <www.sciencedaily.com/releases/2016/01/160128133348.htm>.
Pohang University of Science & Technology (POSTECH). (2016, January 28). A step towards keeping up with Moore's Law: Researchers develop a novel and efficient fabrication technology for cross-shaped memristor. ScienceDaily. Retrieved August 29, 2016 from www.sciencedaily.com/releases/2016/01/160128133348.htm
Pohang University of Science & Technology (POSTECH). "A step towards keeping up with Moore's Law: Researchers develop a novel and efficient fabrication technology for cross-shaped memristor." ScienceDaily. www.sciencedaily.com/releases/2016/01/160128133348.htm (accessed August 29, 2016).