Embodiments of methods in accordance with the present invention provide
a planarized surface between a semiconductor device and a portion of surrounding
passivation material. The methods involve the use of a hard mask that defines the
planarized surface as the interface between the hard mask and both the passivation
layer and the device, after a passivation layer etching process. The resulting
planarized surface has a small to zero step height, is insensitive to passivation
layer non-uniformity and etch non-uniformity, provides full passivation of the
device side wall, provides protection for the device against etch-induced damage,
and prevents the detrimental effects of passivation layer voids. The methods are
applicable to semiconductor device fabrication for electronic and photonic systems
such as, but not limited to, cell phones, networking systems, high brightness (HB)
light emitting diodes (LEDs), laser diodes (LDs), and multijunction solar cells.