News Column

Patent Issued for Parallel Coaxial Molecular Stack Arrays

May 28, 2014

By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Zang, Ling (Salt Lake City, UT); Che, Yanke (Salt Lake City, UT), filed on July 27, 2010, was published online on May 13, 2014.

The patent's assignee for patent number 8723026 is University of Utah Research Foundation (Salt Lake City, UT).

News editors obtained the following quote from the background information supplied by the inventors: "Organic based solar cells have distinct advantages over their inorganic counterparts, such as low cost of fabrication, ease for large area processing, and compatibility with flexible and light weight plastic substrates, and thus have attracted enormous amount of research interest and effort in the past decades. However, the organic cells typically suffer from the low efficiency of light conversion (usually less than 5%) that inhibits their use in practical applications at the present.

"The efficiency of organic solar cells is largely determined by four basic, consequential processes: exciton diffusion; charge generation via electron transfer; charge separation and transport. Although recent developments of bulk-heterojunction materials (e.g., polymer/C60) has shown promise in improving the first two processes by creating charge separation via photoinduced intra- and inter-molecular electron transfer, the poor organization and/or phase segregation of the bulk-mixed materials still limit the charge transport."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "A photocurrent generation device having a nano-composite coaxial cable can include a plurality of stacks. The plurality of stacks can be located between and oriented substantially perpendicular to at least one first electrode and at least one second electrode to enable photocurrent to flow through the stacks. Each stack can have an outer p-channel and an inner n-channel to provide a charge transport for photocurrent between the first and second electrodes. The outer p-channel can include a plurality of macrocyclic .pi.-conjugated planar molecules stacked through columnar self assembly to form the outer p-channel of the nano-composite coaxial cable and having an axial channel therein. The inner n-channel can include a plurality of C60 molecules positioned coaxially within the axial channel of the stack to form the inner n-channel. Collectively, the plurality of stacks form an ordered heterojunction to provide charge transport of photocurrent in the photocurrent generation device.

"The stack-electrode sandwich structure can be formed using any suitable approach. Generally, the macrocyclic .pi.-conjugated planar molecules can be prepared with suitable moieties to obtain the inner and outer channel properties as more fully described below. These macrocyclic .pi.-conjugated planar molecules can be self-assembled into arrays of parallel nano-composite coaxial cable stacks. Generally, the self-assembly can be performed directly on one of the two electrodes, e.g., the transparent glass electrode made of indium tin oxides (ITO). The second electrode can then be formed over the assembled stacks."

For additional information on this patent, see: Zang, Ling; Che, Yanke. Parallel Coaxial Molecular Stack Arrays. U.S. Patent Number 8723026, filed July 27, 2010, and published online on May 13, 2014. Patent URL:

Keywords for this news article include: Electronics, University of Utah Research Foundation.

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Source: Electronics Newsweekly

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