How thin the thinnest solar energy? The latest record was 1 micron. This is equivalent to one percent of the diameter of a human hair, which is the number one percent of traditional standard solar cells.

Ultra-thin, if realized, solar cells will become more broad application space, no longer confined to the ground station or the roof. PV systems can be attached to a variety of surfaces, such as wearable energy equipment as well as vehicles, appliances, buildings.

Recently, South Korean scientists Juho Kim et al., “Applied Physics Letters” (Applied Physics Letters) published the latest research, the introduction of ultra-thin solar cells. Although thin, but the battery is not low conversion efficiency, compared with a thickness of about 3.5 m solar cells, it can produce the same power, but the thickness is reduced to a quarter.

Korean researchers try to inorganic compound semiconductor devices and micro-battery bendable or malleable substrates together, by reducing the thickness of the battery to increase its flexibility for the use of these micro-cell device as clothes, skin and other wearable portable electronic device It provides the possibility of power.

In the past, production, due to the electronic components that need to be adhered to the substrate, the thickness of the adhesive will be an additional battery, the new study uses a “cold welding” method, the material in the top layer of photoresist 170 degrees Celsius By melting, and then welded to the electrode substrate. After the resist will be stripped in the cooling process so that adhesive does not cause an increase in thickness of the battery.

Reducing the thickness of a microelectronic device’s battery is conducive to adapt to a variety of electronic devices for everyday use in the extreme case of bending. In general, the thinner the microelectronic devices, by bending of the pressure the smaller, more easily bent. Meanwhile, the admirable flexibility to carry around electronic devices often require continuous power supply, the experimental results and theoretical analysis show that happens, micro-thin solar cell in the case of extreme bending power more durable. Whether in the continued supply of electricity or the cost of production, we have a great advantage.

Research produced a solar cell material is a micro semiconductor gallium arsenide, reuse mainly by a transfer of the transfer-printing technology, the battery electrode substrate through the bottom of the photons reflected back photovoltaic cells to achieve.

This ultra-thin solar cells are very thin and flexible, it can be wrapped pencil week. Many wearable device limited battery size and weight can not be applied to promote, but this battery feature high flexibility and light weight, will help promote the production of wearable electronic devices, such as powered smart glasses can also be incorporated into clothing wearable device for power supply.

In addition, the future potential of the material, solar cell applications is expected to create many new fields. Like the weight of the more sensitive areas of spacecraft or upper-air sounding balloons, ultra-thin solar cell applications has important scientific value. Glass, fabric, paper, plastic and other materials can be used as a battery carrier and greater value.

In fact, by the end of February this year, researchers at the Massachusetts Institute of Technology had developed the so-called “world’s thinnest and lightest” solar cells. Which solar cell thickness of 2 m, is twice the product development team in Korea. Researchers call it thin enough to be placed in a soap bubble without it cracking. In the wearable device, since the solar cell is very light, it was dressed users can not even see it there. However, MIT at the time of this solar cell conversion efficiency is not very high, and the study of South Korean scientists will further optimize the conversion efficiency of this issue.

However, MIT and South Korean scientists have developed a new ultra-thin solar cells are still in the proof of concept stage, put into real commercial needs time.

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