Green silicon ink speeds up RFID requirements turned out to – silicon ink, RFID, inkjet printing

Primary flexible foil for printed electronic circuits on silicon ink, has come out. Kovio said, for the thin film transistor (TFT) “green” silicon ink to achieve the performance of polysilicon transistors, but the price is only one-third of single crystal silicon, chemicals and energy consumption by only 5% of silicon and 25%. 2008 Kovio mass production of its inkjet print-type RFID tags, the use of silicon ink, the price of RFID tags from the current 15 cents lower to 5 cents

Kovio AmirMashkoori, CEO and chairman, said: “We have the world’s first all-printed transistor. Our film silicon transistors have very high activity, and we can make for CMOS circuits and the n type p type two kinds of devices. now our design rules are 20 micron, 10 micron programs we have been Intel created for its laboratory in 1971. Intel’s first microprocessor only uses more than 2000 transistors, the same , the other end of next year our first mass production of equipment for RFID tags, they will probably only use less than 1,000 transistors. ”

Kovio is creating its own fab, although the use of temperature on plastic grass-roots level is too high (this is its primary reason for using stainless steel foil), but do not require silicon wafer expensive processing equipment and cleanroom environments. Silicon ink devices can be printed in a continuous scroll device manufacturing, and Kovio is greatly reduced in this way to all the RFID tags and flexible electronic devices using a variety of applications similar to the price.

Mashkoori said: “From the perspective of capital, we can get to about 10 million U.S. dollars in funding to build a printable silicon fab, not take 10 billion dollars to build a conventional silicon plant. Of course, with the increase of the amount required, we will need more fab, the problem is that this is a much smaller incremental cost item. and we need only about 5% of the material (1% of the primary costs and 3% cycle time) to create new products. ”

Contrast, the current silicon transistors can be up to 600 square centimeters per volt second (sqcm / Vs) of the activity, and liquid crystal displays and other products used in the activity of polysilicon transistors only about 100sqcm / Vs. Unfortunately, silicon and many laboratories around the world are displayed between the printable organic transistors have much difference. Electrical activity of the organic transistors is less than 1sqcm/Vs, in contrast, Kovio’s silicon ink and electronic activity reached a polysilicon considerable 80sqcm/Vs. Most important, silicon ink can produce transistors fast enough for RFID and most other electronic interface protocol.

Kovio’s silicon ink the only challenge is SeikoEpson last year launched a research project called polysilanes using silicon silane mixture of hydrogen, this mixture is to contain ink jet printing nitrogen in the air, then bake at 500 degrees Celsius, and to excimer laser annealing. Unfortunately, this program in the inkjet printing of electronic activity only 6.8sqcm/Vs, too slow for RFID applications, and electronic activity than Kovio 80sqcm/Vs program to almost 12 times slower.

Speed RFID requirements Kovio VikPavate, vice president of business development, said: “Our program is indeed in the electrical activity of the slower than silicon, but that was all of the current organic and printable silicon circuits to be fast. The most important , our printable activity of silicon used in RFID applications the speed is sufficient, in fact, the speed of our RFID tags have exceeded the HF (13.56MHz high frequency) and UHF (900MHz Ultra High Frequency) band of the specifications. ”

Silicon Ink is a Massachusetts Institute of Technology (MIT) Joe Jacobso professor and his students ColinBulthaup invention – he is Kovio from MIT in 2001, when one of the founders.

Kovio’s silicon ink in addition to have enough speed to easily integrate RFID into the existing structure but also to environmental protection than the silicon chip. Silicon ink using an additional method, the only loss of the materials are entering the circuit. The traditional method of silicon production to adopt an antagonistic or mitigation method, the material covered the entire chip layer, then etching away the material not: for most of the material became waste. Pavate said: “We use an additional method to produce silicon circuits, both in terms of cost or resource preservation is more economic.”

Because the circuit has been Kovio process printing to flexible substrates, which can continuously scroll through the printing device is attached to an antenna on the RFID tag without need for the production of monocrystalline silicon RFID tags more expensive pick up a semiconductor chip processing equipment.

Kovio has applied for more than 86 patents, 12 patents already approved, so that the printing ink through silicon transistor technology to achieve the performance of polysilicon transistors in the intellectual property rights have been protected. Kovio will also set aside part of its process of trade secrets, and that this will bring its unique advantage, but also allow other companies is difficult to reverse engineer its technology.

And Japan have now Kovio ToppanForms companies and bus automatic fare collection system, signed a contract manufacturer of Cubic TransportationSystems – both companies and Kovio a joint development and supply agreement.

Kovio currently has 31 employees, of which 22 are engineers, and has 12 investors, from large venture capital firms KleinerPerkins Caufield & Byers, the industrial giant Matsushita.

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