Light control device, imaging element, and imaging device, and light transmittance control method for light control device
A light control device 10 includes a pair of electrodes 611 and 612 and a stacked structure body 613 ′ of a plurality of light control layers 613 sandwiched by the pair of electrodes 611 and 612 ; and each light control layer 613 has a stacked structure of a first insulating layer 614 , a first nanocarbon film 615 doped with an n-type impurity or not doped with an impurity, a second insulating layer 617 , and a second nanocarbon film 616 doped with a p-type impurity or not doped with an impurity.
1. A light control device, comprising:
a first electrode;
a second electrode; and
a light control layer between the first electrode and the second electrode,
wherein the light control layer has a stacked structure that includes:
a first insulating layer in contact with the first electrode,
a first nanocarbon film that is one of doped with an impurity of a first conductivity type, or undoped,
a second nanocarbon film that is one of doped with an impurity of a second conductivity type, or undoped, wherein the second nanocarbon film is in contact with the first nanocarbon film, and
a second insulating layer in contact with the second electrode.
2. The light control device according to claim 1 , wherein the light control device is configured to:
control an amount of charge generated in at least one of the first nanocarbon film or the second nanocarbon film, wherein the amount of charge generated is controlled based on an application of a voltage to the first electrode and the second electrode; and
control a light transmittance in the light control layer based on the amount of charge.
3. The light control device according to claim 1 , further comprising:
N light control layers; and
(N+1) electrodes, wherein
the N light control layers and the (N+1) electrodes are alternately stacked,
a first set of electrodes, of the (N+1) electrodes, in odd positions are connected to a first interconnection, and
a second set of electrodes, of the (N+1) electrodes, in even positions are connected to a second interconnection.
4. The light control device according to claim 1 , wherein
the first conductivity type is an n-type,
the second conductivity type is a p-type,
a first voltage applied to the first electrode is higher than a second voltage applied to the second electrode,
the second electrode faces the second nanocarbon film through the second insulating layer, and
the first electrode faces the first nanocarbon film through the first insulating layer.
5. The light control device according to claim 1 , wherein a voltage applied to each of the first electrode and the second electrode is a pulsed voltage.
6. The light control device according to claim 5 , wherein the light control device is configured to control a light transmittance in the light control layer based on a change in a duty ratio of the pulsed voltage.
7. The light control device according to claim 1 , wherein at least one of the first nanocarbon film or the second nanocarbon film includes graphene.
8. An imaging element, comprising:
a light receiving element; and
a light control device on a light incidence side of the light receiving element, wherein the light control device includes:
a first electrode;
a second electrode; and
a light control layer between the first electrode and the second electrode,
wherein the light control layer has a stacked structure that includes:
a first insulating layer in contact with the first electrode,
a first nanocarbon film that is one of doped with an impurity of a first conductivity type, or undoped,
a second nanocarbon film that is one of doped with an impurity of a second conductivity type, or undoped, wherein the second nanocarbon film is in contact with the first nanocarbon film, and
a second insulating layer in contact with the second electrode.
9. An imaging device, comprising:
a plurality of imaging elements in a two-dimensional matrix configuration, wherein at least a part of the plurality of imaging elements includes:
a light receiving element; and
a light control device on a light incidence side of the light receiving element, wherein the light control device includes:
a first electrode;
a second electrode; and
a light control layer between the first electrode and the second electrode,
wherein the light control layer has a stacked structure that includes:
a first insulating layer in contact with the first electrode,
a first nanocarbon film that is one of doped with an impurity of a first conductivity type, or undoped,
a second nanocarbon film that is one of doped with an impurity of a second conductivity type, or undoped, wherein the second nanocarbon film is in contact with the first nanocarbon film,
and
a second insulating layer in contact with the second electrode.
10. The imaging device according to claim 9 , wherein the first electrode and the second electrode are shared between the part of the plurality of imaging elements including the light control device.
11. The imaging device according to claim 9 , wherein the first electrode and the second electrode are shared between the plurality of imaging elements.