"NANODIODE: Polymers self-assemble to form 2.5-nm diode"
Chicago professor Luping Yu, who called it the world's smallest. The operation of the polymer-based p-n junction diode, synthesized using organic chemistry by postdoctoral assistant Man-Kit Ng, was verified with a scanning tunneling microscope.

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Story in EE Times: http://www.eet.com/at/news/OEG20021015S0040