In order to realize a "stick-type sensor" capable of efficiently generating electricity in a darkened room at a cost of only 1,000 yen, development of flexible solar cells is under way. Thin-film solar cells manufactured using an organic semiconductor that can be reduced in cost will be made in the form of fine fibers of nm (10-9 m) grade and then woven into "cloths". Plan to use this solar cell plant plant. Japan's NMEMS Technology Research Institute of Green Sensor Network Research Institute, director of Okayama Institute of Ogaki Mingyan Yan "sensor network system in the development of independent power nanofibers" as the keynote address on this solar cell development details.

The goal of the solar cell currently under development is for end-of-network applications and to provide a self-sufficient power source without the need to be replaced after installation, eliminating the need to replace the battery. As a power supply for the sensor network terminal, an existing button-type battery can be used as well, but it must be replaced after reaching the end of its useful life.

Tanigawa is developing a solar cell that can generate enough electricity under indoor light. According to reports, the general indoor illumination for the window 1000lux, the table 400lux, under the table 100lux. The goal of Taniguchi is to develop a solar cell that can drive the sensor network terminal as long as the illuminance of 400 lux on the table is reached.

Suitable for the characteristics of the sensor network terminal environment

To make solar cells suitable for the characteristics of Band-Aid sensor network terminals, Taguchi uses polymer-based materials in organic semiconductors.

Solar cells using organic semiconductors feature a thin, flexible solar cell that uses a resin substrate instead of a silicon substrate. If you can paste in the object, you can achieve free layout. Moreover, even in the installation and after installation of external force is not easy to damage. This solar cell not only has a thin thickness, but also simplifies the installation of the fixture, so it does not occupy space when installed.

Using organic semiconductors also tends to reduce the cost of production. Because you do not need to use expensive, large vacuum manufacturing equipment, just under the air coating polymer materials and the formation of thin-film semiconductor can be. Moreover, the reliability and longevity can also fully meet the demand. Because it can have storage function, it can not supply the required illumination in an environment stable supply of electricity.

The power generation efficiency of solar cells using organic semiconductors has reached a level not inferior to that of amorphous (polycrystalline) silicon solar cells for residential and industrial use. Among the currently available products, the highest level of efficiency of organic semiconductor solar cells is 12%. In the indoor below 1000lux illumination conditions, its efficiency is higher than the amorphous silicon solar cells and so on. In the indoor environment, the organic thin-film solar cell is also very advantageous in terms of efficiency.

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