DNA scaffold for chips

17 August 2009

IBM scientists are using DNA origami to build tiny circuit boards. Low concentrations of triangular DNA origami are binding to wide lines on a lithographically patterned surface
IBM scientists are using DNA origami to build tiny circuit boards. Low concentrations of triangular DNA origami are binding to wide lines on a lithographically patterned surface

Scientists at IBM Research and the California Institute of Technology have announced an advancement that could be a major breakthrough in enabling the semiconductor industry to pack more power and speed into computer chips.

IBM researchers and collaborator Paul W.K. Rothemund of the California Institute of Technology have made an advancement in combining lithographic patterning with self assembly – a method to arrange DNA origami structures on surfaces compatible with today’s semiconductor manufacturing equipment.

The semiconductor industry is faced with the challenges of developing lithographic technology for feature sizes smaller than 22nm and exploring new classes of transistors that employ carbon nanotubes or silicon nanowires. IBM’s approach of using DNA molecules as scaffolding – where millions of carbon nanotubes could be deposited and self-assembled into precise patterns by sticking to the DNA molecules – may provide a way to reach sub-22nm lithography.

The utility of this approach lies in the fact that the positioned DNA nanostructures can serve as scaffolds, or miniature circuit boards, for the precise assembly of components – such as carbon nanotubes, nanowires and nanoparticles – at dimensions significantly smaller than those possible with conventional semiconductor fabrication techniques.

This opens up the possibility of creating functional devices that can be integrated into larger structures, as well as enabling studies of arrays of nanostructures with known co-ordinates.

"The cost involved in shrinking features to improve performance is a limiting factor in keeping pace with Moore’s Law and a concern across the semiconductor industry," said Spike Narayan, Manager of Science and Technology at IBM Research. "The combination of this directed self-assembly with today’s fabrication technology could eventually lead to substantial savings in the most expensive and challenging part of the chip-making process."

The techniques for preparing DNA origami, developed at Caltech, cause single DNA molecules to self-assemble in solution via a reaction between a long single strand of viral DNA and a mixture of different short synthetic oligonucleotide strands. These short segments act as staples, effectively folding the viral DNA into the desired 2D shape through complementary base pair binding. The short staples can be modified to provide attachment sites for nanoscale components at resolutions (separation between sites) as small as 6nm. In this way, DNA nanostructures such as squares, triangles and stars can be prepared with dimensions of 100nm–150nm on an edge and a thickness of the width of the DNA double helix.

The lithographic templates were fabricated at IBM using traditional semiconductor techniques – the same used to make the chips found in modern computers – to etch out patterns. Either electron beam or optical lithography were used to create arrays of binding sites of the proper size and shape to match those of individual origami structures. Key to the process were the discovery of the template material and deposition conditions to afford high selectivity so that origami binds only to the patterns of ‘sticky patches’ and nowhere else.

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