Detecting element and detector
According to an embodiment, a detecting element includes a first electrode, a second electrode, an organic conversion layer, a third electrode. The first electrode and the third electrode are configured to keep different potentials by DC power supply. The organic conversion layer is disposed in between the first electrode and the second electrode, and is configured to convert energy of radiation into electrical charge. The third electrode is disposed at least either in the organic conversion layer, or in between the organic conversion layer and the first electrode, or in between the organic conversion layer and the second electrode, and is at least partially covered by an insulating film.
1. A detecting element comprising:
a first electrode to which a bias voltage is applied;
a second electrode;
an organic conversion layer that is disposed in between the first electrode and the second electrode, and that converts energy of radiation into electrical charge; and
a third electrode that is disposed at least either in the organic conversion layer, or in between the organic conversion layer and the first electrode, or in between the organic conversion layer and the second electrode, and that is at least partially covered by an insulating film.
2. The detecting element according to claim 1 , wherein, in the third electrode, at least either end face present on side of the first electrode or end face present on side of the second electrode in thickness direction of the organic conversion layer is covered by the insulating film.
3. The detecting element according to claim 1 , wherein a first distance between the first electrode and the third electrode is different than a second distance between the second electrode and the third electrode.
4. The detecting element according to claim 3 , wherein, in the third electrode, at least end face present on side of the electrode, of the first electrode and the second electrode, which is closer to the third electrode is covered by the insulating film.
5. The detecting element according to claim 1 , wherein the third electrode is disposed inside the insulating film.
6. The detecting element according to claim 1 , wherein, a plurality of third electrodes having mutually different positions in thickness direction of the organic conversion layer is disposed in the insulating film.
7. The detecting element according to claim 1 , wherein,
the third electrode includes at least one through hole that is formed in a penetrating manner in thickness direction of the organic conversion layer.
8. The detecting element according to claim 7 , wherein,
the third electrode includes a plurality of through holes, each having same size and being formed at equally spaced intervals along direction intersecting with the thickness direction.
9. The detecting element according to claim 7 , wherein the at least one through hole is filled with constituent material of the organic conversion layer.
10. The detecting element according to claim 1 , wherein, in the third electrode, a hole portion is formed that has opening either on side of the first electrode or on side of the second electrode.
11. The detecting element according to claim 10 , wherein, in the third electrode, a plurality of the hole portion having same size is formed at equally spaced intervals along direction intersecting with thickness direction of the organic conversion layer.
12. The detecting element according to claim 10 , wherein in the hole portion is filled with constituent material of the organic conversion layer.
13. The detecting element according to claim 1 , wherein the third electrode is made of a conductive carbon material.
14. A detector comprising:
the detecting element according to claim 1 ;
a voltage applying unit that applies a bias voltage to the first electrode and the third electrode; and
a detecting unit that detects an output signal which is output from the first electrode.
15. The detector according to claim 14 , wherein the first electrode, the second electrode, and each of one or more of the third electrode have mutually different electrical potentials.