Flash Lamp Annealing

Flash lamp annealing

Flash lamp annealing is a method of thermal processing where surfaces are heated in a split second. Typical treatment durations are several microseconds up to some milliseconds. The surface is treated with one or more highly energetic flashes of a flash lamp. Thus, material characteristics can be altered without thermally loading the substrate below.  Because of that, the use of temperature-sensitive substrates is possible.

Flash lamp annealing is faster and less cost-intensive than conventional furnace heating. Moreover, it scarcely causes thermo-mechanical stress in the bulk and diffusion processes are reduced due to the shorter process duration.  

Fields of application

In semiconductor and thin film technology, annealing processes are necessary to improve electrical and optical material properties precisely. At Fraunhofer FEP, we offer our technology expertise in the treatment of transparent conductive oxides, optical thin films and thin film electronics.



We have an in-line flash lamp array at our disposal which can be used for dynamic annealing of samples with a maximum size of 1200 x 600 mm² and a flash power of 5 to 40 J/cm². The array is part of the vacuum coating machine ILA 900. Therefore, different environmental conditions can be investigated. Besides vacuum treatment, flash lamp annealing under air, inert or reactive atmosphere is possible. Our equipment gives the unique opportunity to conduct experiments dynamically on large area and with high energy densities under pilot-scale process conditions.


Lamps 2 overlapping Xe-lamps with 360 mm arc length
Max. power 18 W
Pulse duration 300 µs – 2.7 ms
Energy density 5 – 40 J/cm²
Max. substrate size
1200 × 600 mm²
Substrate transport Vertical in-line
Atmosphere Vacuum, air, inert or reactive atmosphere

Our offer

  •  Research and development of thin-film processes with annealing by FLA
  • Sampling, feasibility studies
  • Annealing of small series
  • Development of FLA processes for functional thin-films or thin-film stacks under pilot-scale process conditions
  • Preparation of concepts, technology transfer and process integration


  • S. Weller: „Blitzlampentemperung von transparenten leitfähigen Oxidschichten”, Dissertation, Technische Universität Bergakademie Freiberg, Fakultät für Werkstoffwissenschaft, 2018.
  • W. Walther: „Untersuchung des Einflusses der Blitzlampentemperung auf die Eigenschaften verschiedener Gläser und Dünnschicht-Glas-Systeme“, Diplomarbeit, Technische Universität Bergakademie Freiberg, Fakultät für Maschinenbau, Verfahrens- und Energietechnik, 2018.
  • M. Junghähnel, J. Westphalen: „Processing on Flexible Glass – Challenges and Opportunities“, SVC Bulletin Fall/Winter, S. 31-39, 2017.
  •  J. Westphalen, M. Junghähnel, G. Lorenz, F. Naumann: „Influence of thin-film properties on the reliability of ultra-thin glass”, 60th Annual SVC Technical Conference, 2017.
  • S. Weller, M. Junghähnel: „Flash Lamp Annealing of ITO thin films on ultra-thin glass“, Vakuum in Forschung und Praxis 27 (4), S. 29-33, 2015.
  • M. Junghähnel, S. Weller, T. Gebel, „P-65: Advanced Processing of ITO and IZO Thin Films on Flexible Glass,” SID Symposium Digest of Technical Papers 46 (1), S. 1378–1381, 2015.
  • J. Westphalen: „Untersuchung der Eigenschaften von gesputterten ZnO:Al-Schichten auf flexiblem Glas, Masterarbeit, Technische Universität Ilmenau, Fakultät für Mathematik und Naturwissenschaften (2015).