Electrostatic discharge protection devices and methods for fabricating electrostatic discharge protection devices

A method for fabricating an electrostatic discharge (ESD) protection device, the method comprising:

• providing a substrate;
• forming a first substrate layer and a second substrate layer over the first substrate layer, wherein each substrate layer comprises a first border region, a second border region being continuous and a middle region extending continuously and laterally from the first border region to the second border region;
• and
• forming a first bridged region and a second bridged region, wherein each bridged region is continuous and arranged within the middle region and a respective border region of the second substrate layer;
• wherein the middle region of the second substrate layer is laterally narrower than the middle region of the first substrate layer, wherein a width of the middle region of the second substrate layer ranges from about 30% to about 70% of a width of the middle region of the first substrate layer;
• wherein each border region of the second substrate layer is arranged over and partially overlapping the middle region of the first substrate layer and arranged over and overlapping a respective border region of the first substrate layer;
• and
• wherein the first and second border regions of the first and second substrate layers and the first and second bridged regions have a first conductivity type, and wherein the middle regions of the first and second substrate layers have a second conductivity type different from the first conductivity type,
• wherein the first and second border regions of each substrate layer include a continuous region of the first conductivity type laterally extending between opposite border edges.