Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Quality of laser-joined contacts of electronic devices

Datum: 15.04.2002



  • Prof. Dr.-Ing. M. Geiger
  • Prof. Dr.-Ing. K. Feldmann, Universität Erlangen

The trends of steady miniaturisation, of high temperature resistance and of environmental-friendly product design in electronics production open up high potentials for the laser-assisted selective joining techniques in the field of interconnection technology. Thereby, it has to be differentiated between the already known and partially, industrially established laser micro soldering and the highly innovative laser micro welding. The thesis takes a closer look at the influence of various process parameters during laser micro soldering and welding (e.g. irradiation strategy, pulse duration and energy, ...), the possibilities of process optimisation through an advanced system technology (e.g. application of process and cover gases, redesign of gas nozzles, ...), the achievable joining qualities as well as the reliability respectively the aging resistance of the micro joints. Additionally, a reliability simulation using the finite elements method delivers a comparative insight into the life cycle of the joints. Through this it is possible to attribute the joining methods laser micro soldering and welding simplified to the diverse application requirements