Light-emitting metal-oxide-semiconductor devices and associated systems, devices, and methods
Various embodiments of solid state transducer (“SST”) devices are disclosed. In several embodiments, a light emitter device includes a metal-oxide-semiconductor (MOS) capacitor, an active region operably coupled to the MOS capacitor, and a bulk semiconductor material operably coupled to the active region. The active region can include at least one quantum well configured to store first charge carriers under a first bias. The bulk semiconductor material is arranged to provide second charge carriers to the active region under the second bias such that the active region emits UV light.
1 . A light emitting device, comprising:
a semiconductor structure including:
a first region having a first side and a second side opposite to the first side; and
a second region connected to the second side of the first region;
a dielectric layer at the first side of the first region;
a first contact connected to the dielectric layer; and
a second contact connected to the second region,
wherein the first region is configured to emit electromagnetic radiation in response to a bias signal applied across the first and second contacts, and
wherein the bias signal includes a first duration at a first voltage and a second duration at a second voltage different than the first voltage.
2 . The light emitting device of claim 1 , wherein the first region includes one or more quantum wells configured to alternate between inversion and accumulation in response to the bias signal applied across the first and second contacts.
3 . The light emitting device of claim 2 , wherein each of the one or more quantum wells has a bandgap configured to emit the electromagnetic radiation while alternating between the inversion and accumulation.
4 . The light emitting device of claim 1 , wherein the second region includes a bulk semiconductor material configured to supply charge carriers to the first region in response to the bias signal applied across the first and second contacts.
5 . The light emitting device of claim 4 , wherein the bulk semiconductor material is an N-type semiconductor configured to supply holes to the first region in inversion and electrons to the first region in accumulation.
6 . The light emitting device of claim 1 , wherein the electromagnetic radiation corresponds to ultraviolet (UV) light.
7 . The light emitting device of claim 1 , wherein:
the first region includes a first semiconductor material having a first bandgap energy; and
the second region includes a second semiconductor material having a second bandgap energy that is greater than the first bandgap energy.
8 . The light emitting device of claim 1 , wherein the semiconductor structure further comprises a third region connected to the first side of the first region such that the third region couples the first region to the dielectric layer.
9 . The light emitting device of claim 8 , wherein the third region includes a third semiconductor material having a third bandgap energy that is greater than a second bandgap energy of a second semiconductor material included in the second region.
10 . The light emitting device of claim 9 , wherein the third semiconductor material is an intrinsic or lightly doped semiconductor material.
11 . The light emitting device of claim 1 , wherein:
the dielectric layer and the first contact collectively forms a first electrode; and
the second contact is part of a second electrode.
12 . A solid state transducer (SST) system, comprising:
a light emitting device including:
a semiconductor structure having:
a first region having a first side and a second side opposite to the first side, and
a second region connected to the second side of the first region;
a dielectric layer at the first side of the first region;
a first contact connected to the dielectric layer; and
a second contact connected to the second region; and
a signal generator operably coupled to the first contact and to the second contact, the signal generator configured to generate a bias signal across the first and second contacts to cause the first region of the semiconductor structure to emit electromagnetic radiation,
wherein the bias signal includes a first duration at a first voltage and a second duration at a second voltage different than the first voltage.
13 . The SST system of claim 12 , wherein the first region includes one or more quantum wells configured to alternate between inversion and accumulation in response to the bias signal applied across the first and second contacts.
14 . The SST system of claim 13 , wherein each of the one or more quantum wells has a bandgap configured to emit the electromagnetic radiation while alternating between the inversion and accumulation.
15 . The SST system of claim 12 , wherein the second region includes an N-type semiconductor material configured to supply holes to the first region in inversion and electrons to the first region in accumulation.
16 . The SST system of claim 12 , wherein the first duration generates a first electric field across the dielectric layer to bring the first region to inversion and the second duration generates a second electric field across the dielectric layer to bring the first region to accumulation.
17 . The SST system of claim 16 , wherein:
the first electric field at least partially charges the first region of the semiconductor structure during the first duration; and
the second electric field at least partially discharges the first region of the semiconductor structure during the second duration.
18 . The SST system of claim 16 , wherein a duty cycle of the first and second duration is configured such that the first region of the semiconductor structure emits the electromagnetic radiation throughout the first and second duration.
19 . The SST system of claim 16 , wherein a duty cycle of the first and second duration is configured such that the first region of the semiconductor structure does not emit the electromagnetic radiation for a portion of the first and second duration.
20 . A light emitting device, comprising:
a semiconductor structure including:
an active region having a first side and a second side opposite to the first side, and
a bulk region connected to the second side of the active region;
a dielectric layer at the first side of the active region;
a first contact connected to the dielectric layer; and
a second contact connected to the bulk region,
wherein the active region is configured to emit ultraviolet (UV) light in response to a bias signal applied across the first and second contacts,
wherein the bias signal the bias signal includes a first duration at a first voltage and a second duration at a second voltage different than the first voltage.