Photovoltaic Cell Business

TAK Materials Corporation deals in the following products

High quality semiconductor silicon essential to fabricating semiconductor devices and
photovoltaic cells, which will serve to solve the problems of global warming and
energy resources depletion that currently attracts global attention.

Silicon raw material and auxiliary materials which are necessary to produce semiconductor silicon.

Expendable parts for semiconductor production equipment.

Photovoltaic cells.

What is a photovoltaic cell? It is a device that converts sunlight directly into electricity by the photovoltaic effect.

It is said that the energy resources of so-called fossil fuel such as coal, petroleum and natural gas would be depleted in fifty to one hundred yeas if we continuously use them as we do today.
One of the promising solutions to the problem of energy resource depletion which assumes a serious aspect year by year is photovoltaic power generation, utilizing inexhaustible energy from sunlight; and besides, photovoltaic power generation creates clean energy and in the process of its power generation, it does not exhaust carbon dioxide (CO2) that is suspected as one of the causes of global warming.

The intensity of energy from sunlight which pours into the region where the Japanese archipelago is located is about 1 kW per square meter, which does not seem to be large enough.
However, solar energy is characterized by its ubiquity that it could be utilized at any place where there is sunlight and average 4kWh/m2・day solar energy is available in Japan. While using the electricity converted from sunlight by photovoltaic cells during the daytime, its surplus portion is stored in the secondary batteries for use in the night-time.
It is confirmed that the solar power generation system consisting of photovoltaic cells and secondary batteries is fit for practical use even in Japan.

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Photovoltaic Cell Business

In the G8 Hokkaido Toyako Summit held in July, 2008, Japan set forth an objective of increasing the diffusion of the photovoltaic power generation ten times by 2020 and forty times by 2030 compared with its current diffusion rate. However, it should be noted that current photovoltaic power generation in Japan has a problem as to how it should be diffused in the regions where the duration of sunshine is relatively short and it has a disadvantage that its cost is as expensive as \46/kW while the cost of conventional power generation for general households is \20/kW.

In our photovoltaic cell business, we would like to contribute to global diffusion of photovoltaic power generation irrespective of country by effective utilization of resources and reduction in the total cost of photovoltaic cells.

TAK RECYCLE SILICN WAFERS

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We collect silicon wafers which were scrapped during the process of fabricating semiconductor devices due to performance failure, etc. at semiconductor device manufacturers and recycle them into substrates for fabricating photovoltaic cells. As various layers including a circuit pattern whose secrecy level is high were formed on the surface of the collected silicon wafers, we completely remove them from the surface of the collected silicon wafers by means of our patented surface layer removal technology before they are recycled into substrates for photovoltaic cells. We ensure semiconductor device manufacturers who supply the scrapped wafers to us of complete secrecy over the scrapped wafers by thorough removal of the various layers as well as the circuit pattern formed on their surface.

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Photovoltaic Cell Business

FEATURES OF TAK PHOTOVOLTAIC CELLS

Brand-new single-crystal silicon wafers are generally used for fabricating photovoltaic cells. They are manufactured through a series of processes such as melting silicon raw material, growing a single-crystal ingot, slicing a single-crystal ingot into wafers, polishing wafers, etc. Therefore, total production cost of photovoltaic cells using brand-new single-crystal silicon wafers is high.
On the other hand, we use recycled silicon wafers having a round shape as they are for fabricating photovoltaic cells, which enables us to fabricate photovoltaic cells at low cost. Use of recycled silicon wafers for fabricating photovoltaic cells makes it possible to lessen environmental burden during the fabrication process compared with the case where brand-new single-crystal silicon wafers are used, which will lead to the reduction of carbon dioxide emission .

AWARD

We were granted the Resources, Energy and Technology System Award 2003 sponsored by Clean Japan Center under the jurisdiction of Ministry of Economy, Trade and Industry for our contribution to carbon dioxide zero-emission activities and for creation of clean new energy by effective use of silicon wafers scrapped during the semiconductor device fabrication.

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Photovoltaic Cell Business

PRODUT LINEUP

Photovoltaic Cell Size Thickness
single_cell Recycled single-crystal silicon photovoltaic cell

□156

t=475±75μm

polycrystalline_cell Poly-crystal silicon photovoltaic cell

□156

t=200±20μm

Wafers at Intermediate Stages
wafer1_100 After texture-processing has been done.
wafer2_100 After the an anti-reflection film has been created by the PECVD process.
Photovoltaic Module
gt234s_100 Photovoltaic modules manufactured by KIS