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The Polymer Diode Revolution Is Coming

22.10.2006

American chemists have obtained a sheet of flexible polymer diodes.

The hard silicon substrate on which microcircuits are applied has long thwarted electronic engineers who dream of creating unprecedented devices like a self-luminous T-shirt or an umbrella that can turn sunlight into electricity to power a camping TV. And the way out is in the creation of microcircuits from flexible polymers.

Scientists from Cornell University (USA) have created another prototype for such a chip. The main difference from other similar works is the use of ions with different charges. The device consists of two polymer films bonded to each other, one of them contains positive and the other negative ions.

At the point of contact, they leave their native film and move to the neighboring one until equilibrium is reached. The resulting electric field causes the movement of electrons. And on the outside, two more films of electrically conductive polymers are attached, one of which is also transparent. These are the cathode and the anode.

When a potential difference is applied to them, an electric current will flow through the entire structure: electrons will go in one direction, and holes in the other. Having met, they must recombine, but the migration of ions affects this process.

As a result, it is possible to excite polymer molecules, and they reset their excitation by emitting light. In order to skip it, one electrode is made transparent.

The reverse process is also possible: the excitation of molecules by an external light source and the production of an electric current.

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