Self-aligned rear electrode for diode array element

摘要

A PIN active pixel sensor array including self aligned encapsulated electrodes and a method for forming the same the method including forming an electrically conductive layer over a substrate; forming a first doped semiconductor layer over the conductive layer; photolithographically patterning and etching through a thickness portion of the first doped semiconductor layer and conductive layer to expose the substrate to form a plurality of spaced apart electrodes having an upper portion comprising the first doped semiconductor layer; blanket depositing a second doped semiconductor layer to cover the spaced apart electrodes including the exposed substrate; and, etching through at least a thickness portion of the second doped semiconductor layer.