Patent ID: 8497161

Claim:
A method for forming chips on a wafer, the method comprising: providing a substrate; providing a plurality of semiconductor layers on the substrate; making at least one slit through a portion of the plurality of semiconductor layers to form at least two chips; forming positive and negative electrodes on each of the chips; extending the at least one slit completely through the plurality of semiconductor layers and into the substrate so that the at least two chips are connected to each other only by the substrate, each of the chips comprising a portion of the substrate and a portion of the plurality of semiconductor layers; applying an upper protective film on an upper side of each of the chips except the electrodes and a peripheral protective film into the slit to cover the periphery of the portion on the plurality of semiconductor layers of a related at least one of the chips; providing an extensive protective film extending from the peripheral protective film and in direct contact with the substrate to cover a bed and sidewalls of the at least one slit located within the substrate; and separating the chips from each other.