Copper, gold and tin for efficient chips
08 Dec 2012
Scientists are improving the function of semi-conductors, experimenting with gold, copper or tin and special galvanising processes, from which the LED industry particularly could profit from.
They are particularly small, durable and economical. LEDs have conquered the automotive industry; it is already possible today to recognise the make of a car by the design of the LED headlights.
Whether in the interior, displays, infotainment system or brake lights, parking lights or fog lights – a modern car offers many possibilities for LED technology to be used for lighting.
Unlike the traditional halogen or xenon lights, light emitting diodes need LED drivers. Their most important task: they must continuously supply the light diodes with power. In addition, they are to carry out complex tasks and to control, for example, several LEDs in series, or switch individual ones on in multiple stages if the interior lighting is to be dimmable.
The requirements relating to the drivers are enormous: they must be immune to the high temperature and voltage differences in a car or be resistant to aggressive chemicals. In order to guarantee reliable luminosity, a higher voltage must flow through the circuits of the LED drivers.
Researchers from the Fraunhofer Institute for Microelectronic Circuits and Systems IMS offer manufacturers a process to manufacture the chips that suit these applications: it is based on galvanization, a process in the semiconductor industry, in which special metals are deposited on the semiconductors.
