# US 7,608,824 B2 · Doped carbon nanostructure field emitter arrays for infrared imaging

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- Number: US 7,608,824 B2
- Document ID: US7608824B2
- Status: Granted
- Kind: B2
- Application number: 11/858,296
- Filed: 2007-09-20
- Published: 2009-03-26
- Granted: 2009-10-27
- Earliest claimed: 2007-09-20
- Assignees: UT-Battelle, LLC
- Inventors: Kofi Korsah; Larry R Baylor; John B Caughman; Roger A Kisner; Philip D Rack; Ilia N Ivanov
- Web page: https://patentgrep.com/patent/US7608824B2

## CPC

- H10F 39/184: {Infrared image sensors}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- H10F 39/014: {of CMOS image sensors}
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

An infrared imaging device and method for making infrared detector(s) having at least one anode, at least one cathode with a substrate electrically connected to a plurality of doped carbon nanostructures; and bias circuitry for applying an electric field between the anode and the cathode such that when infrared photons are absorbed by the nanostructures the emitted field current is modulated. The detectors can be doped with cesium to lower the work function.

## Claims

### Claim 1

A detector for detecting infrared photons comprising:
at least one anode;
at least one cathode further comprising a substrate electrically connected to a plurality of doped carbon nanostructures; and
bias circuitry for applying an electric field between said anode and said cathode such that when infrared photons are absorbed by said nanostructures the emitted field current is modulated for use in a readout portion of said circuitry.

### Claim 2 (depends on 1)

The detector of claim 1 wherein said anode further comprises and IR transmissive window.

### Claim 3 (depends on 2)

The detector of claim 2 wherein said IR transmissive window further comprises material selected from the group consisting of glass and ceramic.

### Claim 4 (depends on 1)

The detector of claim 1 wherein said doped carbon nanostructure further comprises cesium.

### Claim 5 (depends on 1)

The detector of claim 1 wherein said carbon nanostructure further comprises at least one structure selected from the group consisting of nanoflakes, nanofibers and nanotubes.

### Claim 6 (depends on 5)

The detector claim 5 wherein said nanotubes further comprise doped vertically aligned carbon nanotubes disposed generally perpendicular to said substrate.

### Claim 7 (depends on 5)

The detector of claim 5 wherein said nanotubes further comprise single wall nanotubes.

### Claim 8 (depends on 5)

The detector of claim 5 wherein said nanotubes further comprise multi wall nanotubes.

### Claim 9 (depends on 1)

The detector of claim 1 wherein said readout circuitry portion further comprises at least one transimpedance preamplifier selected from the group consisting of CMOS input, JFET input, BJT, and GaAs transistor.

### Claim 10 (depends on 1)

The detector of claim 1 wherein said readout circuitry portion further comprises at least one configuration selected from the group consisting of a lock-in amplifier, a transimpedance preamplifier mounted directly under each pixel, preamplifier stages mounted at the edge of the circuit board, and a charged coupled array placed under each pixel.