nanopillar

Nanopillar

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MOLDED IMAGES Previously, it was impossible to make nanopillars through cheap molding processes because the pillars were made from materials that preferred adhering to the mold rather than whatever surface they were supposed to cover.

The usual material for making nanopillars is too brittle to survive handling well. The team demonstrated the nanopillars could stick to plastics, fabric, paper,

and metal, and they anticipate that the arrays will also transfer easily to glass and leather.

Previously it was impossible to make nanopillars through cheap molding processes because the pillars were made from materials that preferred adhering to the mold rather than whatever surface they were supposed to cover.

The usual material for making nanopillars is too brittle to survive handling well. The team demonstrated the nanopillars could stick to plastics fabric paper

and metal and they anticipate that the arrays will also transfer easily to glass and leather.

Briseno with colleagues and graduate students at UMASS Amherst and others at Stanford university and Dresden University of Technology Germany report in the current issue of Nano Letters that by using single-crystalline organic nanopillars

or nanograss they found a way to get around dead ends or discontinuous pathways that pose a serious drawback when using blended systems known as bulk heterojunction donor-acceptor or positive-negative (p-n) junctions for harvesting energy in organic solar cells.

We report here that we have developed at last the ideal architecture composed of organic single-crystal vertical nanopillars.

Nanopillars are engineered nanoscale surfaces with billions of organic posts that resemble blades of grass and like grass blades they are particularly effective at converting light to energy.

In this case the anisotropy is along the nanopillar perpendicular to the substrate. Briseno says The biggest challenge in producing this architecture was finding the appropriate substrate that would enable the molecules to stack vertically.

Vertical nanopillars are ideal geometries for getting around these challenges Briseno says because charge separation/collection is most efficient perpendicular to the plastic device.

In this case our nanopillars highly resemble nanograss. Our systems share similar attributes of grass such as high density array system vertical orientations

We envision that our nanopillar solar cells will appeal to low-end energy applications such as gadgets toys sensors and short lifetime disposable devices s

Instead, silicon nanopillars are arranged precisely into a honeycomb pattern to create a etasurfacethat can control the paths and properties of passing light waves.

Inspired by recent work to enhance the luminescence from diamond nanopillar structures, a team of researchers in Japan has discovered that"umbrella-shaped"diamond nanostructures with metal mirrors on the bottom are more efficient photon collectors than their diamond nanostructure"cousins"of other shapes.

but rather of silicon nanopillars that are arranged precisely into a honeycomb pattern to create a"metasurface"that can control the paths and properties of passing light waves.

"Scanning electron microscope of a metasurface showing silicon nanopillars on a glass substrate. Tilted view is shown on the right and top view on the left.

Instead, silicon nanopillars are arranged precisely into a honeycomb pattern to create a etasurfacethat can control the paths and properties of passing light waves.