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 semiconducting layer over the conductive layer; photolithographically patterning and etching through a thickness portion of the first doped semiconducting layer and conductive layer to expose the substrate to form a plurality of spaced apart electrodes having an upper portion comprising the first doped semiconducting layer; blanket depositing a second doped semiconducting layer to cover the spaced apart electrodes including the exposed substrate; and, etching through at least a thickness portion of the second doped semiconducting layer.