Detector for detecting incident electron beam
A detector, comprising: a semiconductor substrate which detects an incident electron beam; a supporting substrate which is thicker than the semiconductor substrate and which supports the semiconductor substrate; and an insulating film layer which is provided between the semiconductor substrate and the supporting substrate, wherein at least one charge suppression film which is not electrically connected to the semiconductor substrate is formed inside the insulating film layer.
1. A detector, comprising:
a semiconductor substrate which detects an incident electron beam;
a supporting substrate which is thicker than the semiconductor substrate and which supports the semiconductor substrate; and
an insulating film layer which is provided between the semiconductor substrate and the supporting substrate, wherein
at least one charge suppression film which is not electrically connected to the semiconductor substrate is formed inside the insulating film layer.
2. The detector according to claim 1 , wherein the charge suppression film is a conductor.
3. The detector according to claim 1 , wherein the charge suppression film is electrically connected to a power supply outside of the detector.
4. The detector according to claim 1 , wherein
the at least one charge suppression film includes a plurality of charge suppression films, and
the plurality of charge suppression films are stacked via an insulating film in the insulating film layer.
5. The detector according to claim 1 , wherein the semiconductor substrate has a part of a mechanism which converts an electron generated by an incidence of the electron beam into a signal.
6. The detector according to claim 1 , wherein the supporting substrate has conductivity and is fixed to a constant potential via a grounding electrode.
7. The detector according to claim 1 , wherein a reverse surface element which is a semiconductor element is formed on a surface not in contact with the insulating film layer of the supporting substrate.
8. The detector according to claim 7 , wherein
the supporting substrate has a semiconductor layer having the reverse surface element,
the supporting substrate or the insulating film layer has an electron moderating layer, and
a penetration depth of the electron beam with respect to a material constituting the electron moderating layer is smaller than a penetration depth of the electron beam with respect to a material constituting the semiconductor layer.
9. The detector according to claim 8 , wherein a thickness of the electron moderating layer is greater than a penetration depth of the electron beam with respect to the material constituting the electron moderating layer.
10. The detector according to claim 7 , wherein the semiconductor substrate and the reverse surface element are electrically connected to each other via a through electrode which penetrates the insulating film layer and the supporting substrate.
11. The detector according to claim 1 , further comprising a wiring layer which is electrically connected to the semiconductor substrate, wherein
the wiring layer is not formed inside the insulating film layer but formed inside a second insulating film layer in contact with a surface not in contact with the insulating film layer of the semiconductor substrate.