Barth, HenryHenryBarthLetz, SebastianSebastianLetzRebenklau, LarsLarsRebenklau2024-09-092024-09-092024-01-01https://publica.fraunhofer.de/handle/publica/47464910.30420/5662624032-s2.0-85202079737Copper thick-film substrates were produced at Fraunhofer IKTS with a commercial copper thick-film paste system and an IKTS proprietary copper paste to compare them with commercial DBC substrates. Thermal shock testing at IKTS resulted in a total failure of the DBC substrates after only 50 cycles. The copper thick-film substrates survived the planned 1000 temperature cycles without damage, though. Power cycling at Fraunhofer IISB showed a significantly lower reliability for copper thick-film substrates compared to the DBC reference. However, a 25 % higher characteristic lifetime was observed for the thick-film substrates compared to the DBC reference.enconference paper