Method for detecting intensity as function of energy of light and devices for performing same

Patent metadata

Field	Value
Publication number	US-11378446-B2
Application number	US-201816755830-A
Country	US
Kind code	B2
Filing date	Oct 12, 2018
Priority date	Oct 13, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A barristor-based photodetector is disclosed. The photodetector according to an embodiment comprises: a substrate; a gate electrode which is laminated on the substrate; a first electrode and a second electrode which are laminated on the substrate and spaced apart from the gate electrode; a graphene layer which is formed between the substrate and the second electrode and extends toward the first electrode; and a gate insulating layer which is formed between the gate electrode and the graphene layer.

First claim

The invention claimed is:

1. A method of extracting a light intensity based on energy of light, the method comprising:
measuring a spectral response of a barristor device included in a photodetector, and photocurrent of light projected to the barristor device; and
extracting an intensity value based on energy of the light by performing a Fourier transform on the spectral response and the photocurrent.

2. The method of claim 1 , wherein the measuring comprises:
in measuring the spectral response; and
measuring at least one of the photocurrent and a differential value of the photocurrent, based on gate voltage of the photodetector.

3. The method of claim 2 , wherein the measuring of at least one of the photocurrent and the differential value of the photocurrent comprises measuring the differential value of the photocurrent through a lock-in amplification scheme.

4. The method of claim 2 , wherein the measuring of the spectral response comprises determining the spectral response using the following equation:
Spectral Response= T (Φ B ( V G )− E )   [Equation]

wherein Spectral Response denotes the spectral response, V G denotes gate voltage of the barristor device, Φ B denotes a Schottky barrier height of the barristor device, T denotes a function value of a Schottky barrier of the barristor device, and E denotes energy of light projected to the barristor device.

5. The method of claim 4 , wherein the measuring of at least one of the photocurrent and the differential value of the photocurrent further comprises determining the photocurrent using the following equation:
I ph ( V G )=∫ψ( E ) T (Φ B ( V G )− E ) dE   [Equation]

wherein I ph denotes the photocurrent, I ph (V G ) denotes photocurrent based on the gate voltage of the barristor device, and ψ(E) denotes an intensity value based on the energy of the light projected to the barristor device.

6. The method of claim 5 , wherein the measuring of at least one of the photocurrent and the differential value of the photocurrent further comprises determining the differential value of the photocurrent using the following equation:

∂

I
ph

∂

V
G

=

∫

ψ
⁡

(
E
)

⁢

∂

T
⁡

(

Φ
B

⁡

(

V
G

)

-
E

)

∂

V
G

⁢
dE

[
Equation
]

wherein

∂

I
ph

∂

V
G

denotes the differential vale f the photocurrent.

7. The method of claim 6 , wherein the extracting comprises:
performing a Fourier transform on the spectral response;
performing a Fourier transform on at least one of the photocurrent and the differential value of the photocurrent;
performing a deconvolution based on a Fourier transform result for the spectral response and at least one of a Fourier transform result for the photocurrent and a Fourier transform result for the differential value of the photocurrent; and
extracting the intensity value based on the energy of the light by performing an inverse Fourier transform on a result of the deconvolution.

8. The method of claim 7 , wherein a Fourier transform value for the spectral response is determined using the following equation:
F{T (Φ B ( V G )− E )}  [Equation]

wherein F{ } denotes a Fourier transform function.

9. The method of claim 8 , wherein a Fourier transform value for the photocurrent is determined using the following equation:
F{I ph ( V G )}= F{ψ ( E )} F{T (Φ B ( V G )− E )}.  [Equation]

10. The method of claim 9 , wherein a Fourier transform value for the differential value of the photocurrent is determined using the following equation:

F
⁢

{

∂

I
ph

∂

V
G

}

=

F
⁢

{

ψ
⁡

(
E
)

}

⁢
F
⁢

Assignees

• Univ Konkuk Ind Coop Corp

Inventors

• Chung Hyun Jong

Classifications

• H10F30/00

  Individual radiation-sensitive semiconductor devices in which radiation controls the flow of current through the devices, e.g. photodetectors · CPC title

• H10F30/2823

  the devices being conductor-insulator-semiconductor devices, e.g. diodes or charge-coupled devices [CCD] (Insulated-gate field-effect transistors H10F30/282) · CPC title

• H10F77/122

  comprising only Group IV materials · CPC title

• G06F17/14

  Fourier, Walsh or analogous domain transformations {, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms (for correlation function computation G06F17/156; spectrum analysers G01R23/16)} · CPC title

• G01J3/36

  Investigating two or more bands of a spectrum by separate detectors · CPC title