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Quantum Dots Get Doped

Silver and copper atoms are used to create doped nanocrystals--tiny versions of the basic building blocks of semiconductor devices

3 min read
Quantum Dots Get Doped

5 April 2011—At just a few nanometers across, quantum dots are tiny—so tiny that scientists attempting to insert new atoms into their structures have found that the atoms tend to quickly wander back out.

Now an Israel-based team has made these atoms stick, creating the first pairs of p-type and n-type semiconductors, pint-size versions of the building blocks of today’s diodes and transistors. The work could eventually pave the way for new flexible solar cells and LEDs, which would be built from the bottom up.

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The Transistor at 75

The past, present, and future of the modern world’s most important invention

2 min read
A photo of a birthday cake with 75 written on it.
Lisa Sheehan

Seventy-five years is a long time. It’s so long that most of us don’t remember a time before the transistor, and long enough for many engineers to have devoted entire careers to its use and development. In honor of this most important of technological achievements, this issue’s package of articles explores the transistor’s historical journey and potential future.

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