Element chip and manufacturing process thereof
Provided is a manufacturing process of an element chip, which comprises a preparation step, a setting step for setting the substrate on a stage, and a plasma-dicing step for dividing the substrate into a plurality of element chips, wherein the plasma-dicing step is achieved by repeatedly implementing etching routines each including an etching step for etching the second layer along the street regions to form a plurality of grooves and a depositing step for depositing a protective film on inner walls of the grooves, wherein the plasma-dicing step includes a first etching step for forming the grooves each having a first scallop on the inner wall thereof at a first pitch, and a second etching step for forming the grooves each having a second scallop on the inner wall thereof at a second pitch, and wherein the second pitch is greater than the first pitch.
1. A manufacturing process of an element chip, comprising:
a preparation step for preparing a substrate having first and second side and including a first layer and a second layer composed of a semiconductor layer closer to the second side than the first layer, the substrate further containing a plurality of street regions defining a plurality of element regions, the first layer having an opening that exposes the second layer at the street regions;
a setting step for setting the substrate on a stage within a chamber of a plasma processing apparatus with the second side opposing to the stage; and
a plasma-dicing step for dividing the substrate into a plurality of element chips each having the element region, by exposing the substrate to a plasma atmosphere generated within the chamber by applying a high frequency power to an electrode provided with the plasma processing apparatus;
wherein the plasma-dicing step is achieved by repeatedly implementing etching routines each including an etching step for etching the second layer along the street regions to form a plurality of grooves and a depositing step for depositing a protective film on edge surfaces of the opening of the first layer and exposed surfaces of the second layer in inner walls of the grooves,
wherein the plasma-dicing step includes a first etching routine having a first etching step for etching the second layer along the street regions to form the grooves each having a first scallop on the inner wall thereof at a first pitch, and a second etching routine having a second etching step for etching the second layer along the street regions to form the grooves each having a second scallop on the inner wall thereof at a second pitch,
wherein the second pitch is greater than the first pitch,
wherein the first layer comprises a resist layer arranged on an outer most surface of the first layer and comprises another layer other than the resist layer, and
wherein the other layer other than the resist layer includes an insulating layer and a wiring metal layer.
2. The manufacturing process of the element chip according to claim 1 , wherein the first etching step is implemented for a first etching time and the second etching step is implemented for a second etching time, and wherein the second etching time is longer than the first etching time.
3. The manufacturing process of the element chip according to claim 1 , wherein the first etching step is implemented while applying the electrode with a first high frequency power and the second etching step is implemented while applying the electrode with a second high frequency power, and wherein the second high frequency power is greater than the first high frequency power.
4. The manufacturing process of the element chip according to claim 1 , wherein the second side of the substrate is held on the supporting member and the substrate is set on the stage in the setting step by means of an electrostatic chucking mechanism.
5. The manufacturing process of the element chip according to claim 1 , wherein the plasma-dicing step includes a third etching routine having a third etching step for etching the second layer along the street regions to form the grooves each having a third scallop on the inner wall thereof at a third pitch, and wherein the second pitch is greater than the third pitch.
6. The manufacturing process of the element chip according to claim 5 , wherein the second etching step is implemented while applying the electrode with a second high frequency power and the third etching step is implemented while applying the electrode with a third high frequency power, and wherein the second high frequency power is greater than the third high frequency power.
7. An element chip having first and second side, comprising:
a first layer containing an element region; and
a second layer composed of a semiconductor layer closer to the second side than the first layer;
wherein the second layer includes a periphery having a plurality of scallops formed thereon,
wherein the scallops include a first scallop formed at a first pitch and a second scallop formed at a second pitch and positioned closer to the second side than the first scallop, and wherein the second pitch is greater than the first pitch.
8. The element chip according to claim 7 , wherein the scallops include a third scallop formed at a third pitch and positioned closer to the second side than the second scallop, and wherein the second pitch is greater than the third pitch.
9. The manufacturing process of the element chip according to claim 1 , wherein the second etching routine is performed after repeating the first etching routine three or more cycles.
10. The manufacturing process of the element chip according to claim 1 , wherein the first etching routine is repeated less than eight cycles.
11. The manufacturing process of the element chip according to claim 1 ,
wherein the first scallops each having a substantially same depth are formed by repeating the first etching routine,
wherein the second scallops each having a substantially same depth are formed by repeating the second etching routine, and
wherein a depth of each of the second scallops is greater than a depth of each of the first scallops.
12. A manufacturing process of an element chip, comprising:
a preparation step for preparing a substrate having first and second side and including a first layer and a second layer composed of a semiconductor layer closer to the second side than the first layer, the substrate further containing a plurality of street regions defining a plurality of element regions, the first layer having an opening that exposes the second layer at the street regions;
a setting step for setting the substrate on a stage within a chamber of a plasma processing apparatus with the second side opposing to the stage; and
a plasma-dicing step for dividing the substrate into a plurality of element chips each having the element region, by exposing the substrate to a plasma atmosphere generated within the chamber by applying a high frequency power to an electrode provided with the plasma processing apparatus;
wherein the plasma-dicing step is achieved by repeatedly implementing etching routines each including an etching step for etching the second layer along the street regions to form a plurality of grooves and a depositing step for depositing a protective film on edge surfaces of the opening of the first layer and exposed surfaces of the second layer in inner walls of the grooves,
wherein the plasma-dicing step includes a first etching routine having a first etching step for etching the second layer along the street regions to form the grooves each having a first scallop on the inner wall thereof at a first pitch, and a second etching routine having a second etching step for etching the second layer along the street regions to form the grooves each having a second scallop on the inner wall thereof at a second pitch,
wherein the second pitch is greater than the first pitch, and
wherein the first layer comprises an insulating layer, a wiring metal layer, and a resist layer that is arranged on an outer most surface of the first layer.