Where Do the Dopants Go?

by Scott Roy & Asen Asenov Science, 15 Jul 2005 As the field-effect transistors used in modern electronic devices continue to shrink, scientists and engineers face new challenges. Roy and Asenov discuss one such challenge: the problem that as device sizes shrink beyond a certain size, atomic-scale differences between devices result in different macroscopic properties. In particular, the locations and numbers of dopant atoms, introduced to alter the electrical properties of regions of the transistor, differ from device to device. The authors discuss recent successes in modeling the dopant distributions and their effects on transistor properties. Such simulations may help researchers to design devices that are resistant to fluctuations in dopant distributions. Read more