Source: https://patents.justia.com/patent/10249836
Timestamp: 2019-08-22 15:26:23
Document Index: 575612587

Matched Legal Cases: ['Application No. 201710295428', 'art 3213', 'arts 3211', 'arts 3211', 'art 3213', 'arts 3211', 'art 3213', 'art 3233', 'arts 3231', 'arts 3231', 'art 3233', 'arts 2231', 'art 3233', 'arts 3211', 'arts 3231', 'art 3231', 'art 3233', 'arts 3211', 'arts 3231']

US Patent for Photodetector Patent (Patent # 10,249,836 issued April 2, 2019) - Justia Patents Search
Justia Patents Organic Semiconductor MaterialUS Patent for Photodetector Patent (Patent # 10,249,836)
Aug 25, 2017 - Tsinghua University
A photodetector includes a substrate, an interdigital electrode layer and a photoactive layer. The interdigital electrode layer is located or sandwiched between the substrate and the photoactive layer. The interdigital electrode layer includes a first interdigital electrode and a second interdigital electrode. The first interdigital electrode and the second interdigital electrode are spaced from and staggered with each other.
This application claims priority to Chinese Patent Application No. 201710295428.7, filed on Apr. 28, 2017, the disclosure of which is incorporated herein by reference.
The present disclosure relates to a photodetector and a method for making the same.
Referring to FIG. 1 and FIG. 2, a photodetector 200 according to one embodiment is provided. The photodetector comprises a substrate 210, an interdigital electrode layer 220, and a photoactive layer 230. The interdigital electrode layer 220 is located or sandwiched between the substrate 210 and the photoactive layer 230.
Referring to FIG. 3 and FIG. 4, a method of forming the photodetector 200 is provided. The photodetector 200 is formed in an apparatus 100. The method of making the photodetector 200 comprises the following steps:
The carbon nanotube film structure 112 comprises a single carbon nanotube film or at least two stacked carbon nanotube films. The carbon nanotube film comprises a plurality of nanotubes. The plurality of nanotubes are generally parallel to each other and arranged substantially parallel to a surface of the carbon nanotube film structure 112. The carbon nanotube film structure 112 has uniform thickness. The carbon nanotube film can be regarded as a macro membrane structure. In the macro membrane structure, an end of one carbon nanotube is joined to another end of an adjacent carbon nanotube arranged substantially along the same direction by Van der Waals attractive force. The carbon nanotube film structure 112 and the carbon nanotube film have a macro area and a microscopic area. The macro area denotes a membrane area of the carbon nanotube film structure 112 or the carbon nanotube film when the carbon nanotube film structure 112 or the carbon nanotube film is regarded as a membrane structure. In the microscopic area, the carbon nanotube film structure 112 or the carbon nanotube film is a network structure having a large number of nanotubes joined end to end. The microscopic area is a surface area of the carbon nanotubes actually carrying the photoactive material 114.
The carbon nanotube film includes a plurality of carbon nanotubes that can be joined end to end and arranged substantially along the same direction. Referring to FIG. 5, a majority of carbon nanotubes in the carbon nanotube film can be oriented along a preferred orientation, meaning that a large number of the carbon nanotubes in the carbon nanotube film are arranged substantially along the same direction. An end of one carbon nanotube is joined to another end of an adjacent carbon nanotube arranged substantially along the same direction by Van der Waals attractive force. A small number of the carbon nanotubes are randomly arranged in the carbon nanotube film and has a small if not negligible effect on the larger number of the carbon nanotubes in the carbon nanotube film arranged substantially along the same direction.
In the step S21, the photoactive material 114 is located on the surface of the carbon nanotube film structure 112 by a plurality of methods, such as solution method, vapor deposition method, plating method or chemical plating method. The deposition method may be chemical vapor deposition (CVD) method or physical vapor deposition (PVD) method.
Referring FIG. 7 and FIG. 8, in one embodiment, a solution method for depositing the photoactive material 114 on the surface of the carbon nanotube film structure 112 comprises steps of: (a) dispersing methyl ammonium iodide and lead iodide uniformly in an organic solvent with a stoichiometric ratio to form a dispersion; (b) spraying the dispersion on the surface of the carbon nanotube film structure 112; (c) evaporating and drying the organic solvent on the surface of the carbon nanotube film structure 112. The step of spraying and drying can be repeated many times so that the photoactive material 114 on the surface of the carbon nanotube film structure 112 has a required amount.
Referring FIG. 10 and FIG. 11, in one embodiment, after inputting the electrical current to the carbon nanotube film structure 112, the temperature of the carbon nanotube film structure 112 rises quickly, the mixture of the methylammonium iodide and the lead iodide located on the surface of the carbon nanotube film structure 112 is instantly gasified, and a perovskite structure CH3NH3PbI3 film is formed on the depositing surface. FIG. 10 shows a structure of the evaporating source 110 after vacuum evaporation. After evaporating the photoactive material 114 located on the surface structure of the carbon nanotube film structure 112, the carbon nanotube film structure 112 retains an original network structure, and the carbon nanotubes of the carbon nanotube film structure 112 are still joined end to end. FIG. 11 shows that the methylammonium iodide and the lead iodide continue a chemical reaction after gasification, and form a thin film having a uniform thickness on the depositing surface. Referring to FIG. 12, the thin film can be tested by XRD (X-ray diffraction). The XRD can determine and show as patterns that a material of the thin film is the perovskite structure CH3NH3PbI3.
Referring to FIG. 13 and FIG. 14, a method of forming the photodetector array 300 is provided. The method of forming the photodetector array 300 may comprise the following steps:
Referring FIG. 14, each sub-interdigital electrode layer 325 comprises a first interdigital electrode 321 and a second interdigital electrode 323. The first interdigital electrode 321 comprises a first connection part 3213 and a plurality of first interdigital parts 3211. The plurality of first interdigital parts 3211 are in connection with the first connection part 3213. The plurality of first interdigital parts 3211 are parallel to and spaced from each other. The first connection part 3213 is used to electrically connect with an external power source. The second interdigital electrode 323 comprises a second connection part 3233 and a plurality of second interdigital parts 3231. The plurality of second interdigital parts 3231 are in connection with the second connection part 3233. The plurality of second interdigital parts 2231 are parallel to and spaced from each other. The second connection part 3233 is used to electrically connect with an external power source. The plurality of first interdigital parts 3211 and the plurality of second interdigital parts 3231 are staggered and spaced from each other. A shape of a first interdigital electrode 321 and a second interdigital electrode 323 is not limited and can be selected according to actual needs. In one embodiment, a shape of the first connection part 3231 and the second connection part 3233 is “L”. A shape of each first interdigital parts 3211 and second interdigital parts 3231 is rectangular strip.
The the step S30 in the method of forming the photodetector array 300 is the same as the step S21 in the method of forming the photodetector 200.
The the step S40 in the method of forming the photodetector array 300 is substantially the same as the S22 in the method of forming the photodetector 200, except that the photoactive layer 330 is formed on an exposed interdigital electrode layer 320 not covered by the patterned mask layer 340.
an interdigital electrode layer comprising a first interdigital electrode and a second interdigital electrode, wherein the first interdigital electrode and the second interdigital electrode are spaced from and staggered with each other; and
wherein the interdigital electrode layer is sandwiched between the substrate and the photoactive layer, the first interdigital electrode comprises a first connection part and a plurality of first interdigital parts in connection with the first connection part, and the plurality of first interdigital parts are parallel with and spaced apart from each other; the second interdigital electrode comprises a second connection part and a plurality of second interdigital parts in connection with the second connection part, and the plurality of second interdigital parts are parallel with and spaced apart from each other; the plurality of first interdigital parts and the plurality of second interdigital parts are staggered and spaced apart from each other, a distance between adjacent one of the plurality of first interdigital parts and one of the plurality of the second interdigital parts is about 20 μm.
2. The photodetector of claim 1, wherein a thickness of the interdigital electrode layer ranges from about 50 nm to about 150 nm.
3. The photodetector of claim 1, wherein a material of the photoactive layer is CH3NH3PbI3.
4. The photodetector of claim 1, wherein the interdigital electrode layer is 500×500 μm2 square shaped.
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Patent Publication Number: 20180315940
Application Number: 15/686,246
International Classification: H01L 51/44 (20060101); C23C 14/24 (20060101); H01L 51/00 (20060101);