Method of manufacturing semiconductor chip, semiconductor chip, and semiconductor device
A method of manufacturing a semiconductor chip according to an embodiment includes forming on a semiconductor substrate a plurality of etching masks each including a protection film to demarcate a plurality of first regions of the substrate protected by the plurality of etching masks and a second region as an exposed region of the substrate, and anisotropically removing the second region by a chemical etching process to form a plurality of grooves each including a side wall at least partially located in the same plane as an end face of the etching mask and a bottom portion reaching a back surface of the substrate, thereby singulating the semiconductor substrate into a plurality of chip main bodies corresponding to the plurality of first regions.
1. A semiconductor chip comprising:
a chip main body including a surface region which includes a semiconductor element,
wherein an end face of the chip main body has stripe-shaped recesses or projections, each of the recesses extending from a surface of the chip main body on the surface region's side toward an opposite surface thereof and each of the projections each extending from a surface of the chip main body on the surface region's side toward an opposite surface thereof, and
each of the recesses or the projections has a width of 10 to 100 nm.
2. The semiconductor chip of claim 1 , further comprising a protection film covering the surface region,
wherein a contour of a surface of the chip main body on the surface region's side agrees, at least partly, with a contour of an orthogonal projection of the protection film onto a plane including the surface of the chip main body on the surface region's side.
3. The semiconductor chip of claim 1 , wherein a surface of the chip main body on the surface region's side includes no corner portion which is defined by two line segments which are in contact at one end.
4. The semiconductor chip of claim 1 , wherein the semiconductor element includes a transistor.
5. The semiconductor chip of claim 1 , wherein the semiconductor element includes a diode.
6. The semiconductor chip of claim 1 , wherein the semiconductor element includes a light-emitting diode.
7. The semiconductor chip of claim 1 , wherein the semiconductor element includes a semiconductor laser.
8. The semiconductor chip of claim 4 , wherein the element region further includes a capacitor.
9. The semiconductor chip of claim 4 , wherein the element region further includes a wiring.