Engineering

Solving the mystery of ultralow-voltage LEDs

Light-emitting diodes (LEDs) have created far-reaching impacts on display and lighting industries. For a LED to emit light, the minimum voltage is widely considered to be equal to the bandgap voltage of the material, in consideration ...

Energy & Green Tech

New membrane improves reversibility of zinc-air batteries

The long-standing challenges to the practical implementation of rechargeable zinc-air batteries (ZABs) are the electrochemical irreversibility of the Zn anode and degradation of the air cathodes in alkaline electrolyte, which ...

Electronics & Semiconductors

Logical switching using one single molecule

Logic gates, the basic elements of the digital world, can now be built using one single molecule. An example is XOR, with two inputs. If at least one of them is "1," then the output is "1," as well; otherwise, it is 0. These ...

Electronics & Semiconductors

High-performance hysteresis-free perovskite transistors

Robot vacuums often stumble on door thresholds that are not particularly high. A similar threshold voltage exists in a transistor through which current flows. As long as the voltage exceeds the threshold voltage, the output ...

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