Metal-ceramic substrate with contact area

A metal-ceramic substrate comprising

• a) a ceramic body having a main extension plane,
• b) a metal layer which is connected to the ceramic body in a planar manner, wherein the metal layer has a structuring region which;
• (i) comprises a partially solid material, and,
• (ii) comprises non-solid material in regions, and,
• c) a contact region arranged on the metal layer comprising silver, wherein in a cross section through the metal-ceramic substrate perpendicular to the main extension plane, the structuring region has a geometry, wherein the following requirement is met:
• S(BCsolid)/S(BCtotal)>60%, where:
• S(BCtotal) stands for the total length of the line between points B and C;
• and,
• S(BCsolid) is the length of the segment between points B and C that cuts solid material, where points B and C are determined as follows:
• 1. the regression line between the ceramic body and the metal layer is determined;
• 2. the contour line is determined that separates the solid material from the non-solid material;
• 3. on a perpendicular to the best-fit line, at a distance of 150 pm from the best-fit line, point A is determined at which the perpendicular to the best-fit line intersects the contour line;
• 4. on a perpendicular to the best-fit line, at a distance of 80 pm from the best-fit line, point B is determined at which the perpendicular to the best-fit line intersects the contour line;
• and.
• 5. on a straight line that passes through points A and B, the point C is determined at which the straight line intersects the regression line.