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Follow the Money: Tiny Transistors Track Cash


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Array on five-dollar bill

Manufactured with minute amounts of aluminum and gold using a special dry process, each flexible 250-nanometer-thick array needs only three volts to operate.

Hagen Klauk, Max Planck Institute of Solid State Research

Banks have long considered placing silicon transistors on currency for security purposes, but the technology was too chunky and intensive for paper bills. Now, tiny low-power organic transistors developed by German scientists could make it possible to really follow the money.

From Discovery
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