Putting solar cells on plastic creates some interesting possibilities, according to University of California chemists A. Paul Alivisatos, Wendy Huynh, and Janke Dittmer. "This opens up all sorts of new applications, like putting solar cells on clothing to power LEDs, radios, or small computer processors," says Dittmer. The team created a hybrid solar cell made from tiny rods dispersed in an organic polymer layer. The nanorods act like wires. When they absorb light, they generate electrons, which travel the length of the rod until collected by an aluminum electrode. The polymer layer is 200 nanometers thick—less than the width of a human hair—and is sandwiched in between the electrodes. The hybrid solar cell generates 0.7V. Unlike semiconductor-based photovoltaic devices, the plastic solar cells can be made without clean rooms and vacuum chambers. Visit www.berkeley.edu.
MIT students modified a 3D printer to enable it to print more than one object and print on top of existing printed objects. All of this was made possible by modifying a Solidoodle with a height measuring laser.
This Gadget Freak Review looks at a keyless Bluetooth padlock that works with your smartphone, along with a system that tracks your sleep behavior and wakes you at the perfect time in your sleep cycle to avoid morning grogginess.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.