WO2015119039A1 - 光電変換素子およびイメージセンサ - Google Patents
光電変換素子およびイメージセンサ Download PDFInfo
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- WO2015119039A1 WO2015119039A1 PCT/JP2015/052530 JP2015052530W WO2015119039A1 WO 2015119039 A1 WO2015119039 A1 WO 2015119039A1 JP 2015052530 W JP2015052530 W JP 2015052530W WO 2015119039 A1 WO2015119039 A1 WO 2015119039A1
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- Prior art keywords
- photoelectric conversion
- conversion element
- group
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- H10K85/322—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising boron
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- H10K30/30—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising bulk heterojunctions, e.g. interpenetrating networks of donor and acceptor material domains
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Definitions
- the present invention relates to a photoelectric conversion element that can convert light into electric energy. More specifically, the present invention relates to a photoelectric conversion element that can be used in fields such as solar cells and image sensors.
- a photoelectric conversion element that can convert light into electrical energy can be used for solar cells, image sensors, and the like.
- image sensors that read current generated from incident light by a photoelectric conversion element using a CCD or CMOS circuit are widely used.
- an inorganic material is used as a material constituting the photoelectric conversion film.
- inorganic substances have low color selectivity, they cannot absorb only light of a specific wavelength. Therefore, it is necessary to provide a color filter in front of the photoelectric conversion film so as to selectively transmit only specific colors (for example, red, green, and blue) from the incident light.
- specific colors for example, red, green, and blue
- a color filter when a fine target is photographed, the pitch of the target interferes with the pitch of the image sensor, and an image (moire defect) different from the original image is generated. If an optical lens or the like is further used to suppress this, there is a problem that the light utilization efficiency and the aperture ratio are lowered.
- photoelectric conversion elements using organic compounds have been studied. Since an organic compound can selectively absorb light in a specific wavelength region among incident light according to the molecular structure, a photoelectric conversion element using the organic compound does not require a color filter. Furthermore, since the absorption coefficient is high, it is possible to increase the light utilization efficiency.
- a photoelectric conversion element using an organic compound there is specifically known an element configuration in which a pn junction structure or a bulk heterojunction structure is introduced into a photoelectric conversion film sandwiched between an anode and a cathode (for example, Patent Documents). 1 to 3).
- Patent Document 4 An element configuration in which a charge blocking layer is inserted to reduce dark current is also known (see, for example, Patent Document 4).
- an object of the present invention is to solve the problems of the prior art and provide a photoelectric conversion element having high photoelectric conversion efficiency and high color selectivity.
- the present invention is a photoelectric conversion element that converts at least one organic layer between a first electrode and a second electrode and converts light into electric energy, and is represented by the general formula (1) in the organic layer.
- R 1 to R 4 are an alkyl group, a cycloalkyl group, an alkoxy group or an aryl ether group, and may be the same or different;
- R 5 and R 6 are a halogen, hydrogen or an alkyl group, and are the same or different.
- R 7 is an aryl group, heteroaryl group or alkenyl group;
- M represents an m-valent metal and is selected from boron, beryllium, magnesium, aluminum, chromium, iron, nickel, copper, zinc and platinum
- L is selected from a halogen, hydrogen, an alkyl group, an aryl group, and a heteroaryl group;
- m is 1 to 6, and when m-1 is 2 or more, each L is the same or different from each other May be.
- a photoelectric conversion element having high photoelectric conversion efficiency and high color selectivity can be provided.
- the schematic cross section which shows an example of the photoelectric conversion element of this invention.
- the schematic cross section which shows an example of the photoelectric conversion element of this invention.
- the schematic cross section which shows an example of the photoelectric conversion element of this invention.
- the schematic cross section which shows an example of the photoelectric conversion element of this invention.
- FIG. The absorption spectrum of the compound used for the photoelectric converting layer of the comparative example 1.
- the schematic cross section which shows an example of the laminated structure of the photoelectric conversion element of the image sensor of this invention.
- the schematic cross section which shows another example of the laminated structure of the photoelectric conversion element of the image sensor of this invention.
- the spectral sensitivity characteristic of the photoelectric conversion element of Example The spectral sensitivity characteristic of the photoelectric conversion element of the comparative example 1.
- the photoelectric conversion element of the present invention is a photoelectric conversion element in which at least one organic layer is present between a first electrode and a second electrode, and converts light into electric energy. It contains a compound represented by 1).
- the organic layer includes at least one photoelectric conversion layer that converts light into electric energy.
- 1 to 4 show examples of the photoelectric conversion element of the present invention.
- FIG. 1 is an example of a photoelectric conversion element having a photoelectric conversion layer 15 between the first electrode 10 and the second electrode 20.
- the organic layer is composed of only one photoelectric conversion layer as shown in FIG. 1
- the charge blocking layer is a layer having a function of blocking electrons or holes. When it is inserted between the anode and the photoelectric conversion layer, it is called an electron blocking layer 13, and when it is inserted between the cathode and the photoelectric conversion layer, it is called a hole blocking layer 17.
- the organic layer may contain only one of these layers, or may contain both.
- the first electrode 10 is an anode and the second electrode 20 is a cathode will be described as an example.
- the anode and the cathode have a role for allowing electrons and holes generated in the element to flow and sufficiently flowing current. It is desirable that at least one of the anode and the cathode is transparent or translucent so that light enters the photoelectric conversion layer.
- the anode formed on the substrate is preferably a transparent electrode.
- the anode is preferably made of a material that can efficiently extract holes from the photoelectric conversion layer and is transparent.
- Materials include conductive metal oxides such as tin oxide, indium oxide and indium tin oxide (ITO); metals such as gold, silver and chromium; inorganic conductive materials such as copper iodide and copper sulfide; polythiophene, polypyrrole, Conductive polymers such as polyaniline are preferable, and it is particularly preferable to use ITO glass or nesa glass in which a transparent conductive film is formed on a glass substrate.
- the transparent electrode is sufficient if a current generated by the element can flow sufficiently, but it is preferable that the transparent electrode has a low resistance from the viewpoint of photoelectric conversion efficiency of the element.
- an ITO substrate having a resistance value of 300 ⁇ / ⁇ or less is particularly preferable.
- the thickness of the ITO can be arbitrarily selected according to the resistance value, but is usually used in a range of 50 to 300 nm.
- the glass substrate is preferably made of less alkali ions or soda lime glass with a barrier coating such as SiO 2 because it is better for the ions to be eluted from the glass.
- the thickness of the glass substrate is preferably 0.5 mm or more from the viewpoint of mechanical strength.
- the substrate does not have to be glass.
- an ITO film may be formed on a plastic substrate to serve as the anode.
- the method for forming the ITO film is not particularly limited, such as an electron beam method, a sputtering method, or a chemical reaction method.
- the material for the cathode a substance capable of efficiently extracting electrons from the photoelectric conversion layer is preferable.
- the material include platinum, gold, silver, copper, iron, tin, zinc, aluminum, indium, chromium, lithium, sodium, potassium, calcium, magnesium, cesium, and strontium.
- a low work function metal selected from lithium, sodium, potassium, calcium, magnesium and cesium or an alloy containing these low work function metals is effective for improving the device characteristics by increasing the electron extraction efficiency.
- these low work function metals are often often unstable in the atmosphere.
- a method of using a highly stable electrode by doping a small amount of lithium, magnesium, or cesium (1 nm or less in terms of a film thickness meter of vacuum deposition) can be given as a preferable example.
- An inorganic salt such as lithium fluoride can also be used.
- metals such as platinum, gold, silver, copper, iron, tin, aluminum, indium, or alloys using these metals, and inorganic substances such as silica, titania, silicon nitride, polyvinyl alcohol, vinyl chloride, It is preferable to laminate a hydrocarbon polymer or the like.
- methods for producing these electrodes methods such as resistance heating, electron beam, sputtering, ion plating, and coating are preferably used.
- the photoelectric conversion layer may be composed of a single photoelectric conversion element material, but in order to obtain high photoelectric conversion efficiency, it is preferably composed of two or more types of photoelectric conversion element materials. More preferably, it is composed of a conversion element material and an electron-accepting photoelectric conversion element material.
- the photoelectric conversion layer may be a single layer in which two or more types of photoelectric conversion element materials are mixed, or each one or more types of photoelectric conversion elements. A plurality of layers in which layers of materials are stacked may be used. Furthermore, the structure by which the mixed layer and each single layer were mixed may be sufficient.
- Electrode acceptability here refers to the property of high electron affinity and easy electron reception. Further, the electron donating property indicates a property of easily releasing electrons.
- the photoelectric conversion layer is composed of an n-type organic semiconductor material having a high electron-accepting property and a p-type organic semiconductor material having a high electron-donating property, excitons generated in the photoelectric conversion layer by incident light return to the ground state. Before, it can be efficiently separated into electrons and holes. The separated electrons and holes flow to the cathode and the anode through the n-type organic semiconductor material and the p-type organic semiconductor material, respectively, so that high photoelectric conversion efficiency can be obtained.
- the absorption wavelength of the photoelectric conversion layer is determined by the light absorption wavelength region of the photoelectric conversion material constituting the photoelectric conversion layer, it is preferable to use a material having light absorption characteristics corresponding to the color to be used.
- the photoelectric conversion layer is made of a material that absorbs light at 450 nm to 550 nm.
- the photoelectric conversion layer is composed of two or more materials in order to obtain high photoelectric conversion efficiency as described above, the energy levels of the p-type organic semiconductor material and the n-type organic semiconductor material are efficient for holes and electrons.
- the photoelectric conversion layer is preferably formed using a material that can be well separated and moved to the electrode side.
- the p-type organic semiconductor material may be any organic compound as long as it has a relatively small ionization potential, an electron donating property, and a hole transporting compound.
- p-type organic semiconductor materials include compounds having derivatives such as naphthalene, anthracene, phenanthrene, pyrene, chrysene, naphthacene, triphenylene, perylene, fluoranthene, fluorene, and indene, and derivatives thereof; cyclopentadiene derivatives, Furan derivatives, thiophene derivatives, pyrrole derivatives, benzofuran derivatives, benzothiophene derivatives, indole derivatives, pyrazoline derivatives, dibenzofuran derivatives, dibenzothiophene derivatives, carbazole derivatives, indolocarbazole derivatives; N, N'-dinaphthyl-N, N'-diphenyl Aromatic amine derivatives such as -4,4
- the n-type organic semiconductor material may be any material as long as it has a high electron affinity and is an electron transporting compound.
- n-type organic semiconductor materials include condensed polycyclic aromatic derivatives such as naphthalene and anthracene; styryl aromatic ring derivatives typified by 4,4′-bis (diphenylethenyl) biphenyl, tetraphenylbutadiene derivatives, coumarins Derivatives, oxadiazole derivatives, pyrrolopyridine derivatives, perinone derivatives, pyrrolopyrrole derivatives, thiadiazolopyridine derivatives, pyrimidine derivatives, triazine derivatives, aromatic acetylene derivatives, aldazine derivatives, pyromethene derivatives, diketopyrrolo [3,4-c] pyrrole Derivatives; Azole derivatives such as imidazole, thiazole, thiadiazole, oxazole
- the compound represented by the general formula (1) described later has an absorption coefficient of 1 ⁇ 10 5 cm ⁇ 1 or more, and the absorption coefficient is higher than that of conventionally used inorganic photoelectric conversion materials. 1 to 2 digits higher. Therefore, since light can be efficiently absorbed and converted into electric energy, the sensitivity of the photoelectric conversion element can be improved. Furthermore, since the compound represented by the general formula (1) has a sharp absorption spectrum, the wavelength selection accuracy is high, and the color selectivity of the photoelectric conversion element can be improved.
- the compound represented by the general formula (1) absorbs light in a wavelength region of about 450 nm to 550 nm, it is preferably used for a green photoelectric conversion layer.
- the compound represented by the general formula (1) preferably functions as an electron-accepting photoelectric conversion element material because it includes a pyromethene skeleton. Therefore, it is preferably used as an n-type organic semiconductor material.
- the charge blocking layer is a layer used to efficiently and stably take out electrons and holes photoelectrically converted in the photoelectric conversion layer from the electrode.
- An electron blocking layer that blocks electrons and a hole that blocks holes.
- a blocking layer may be comprised from the inorganic substance and may be comprised from the organic compound. Furthermore, you may consist of a mixed layer of an inorganic substance and an organic compound.
- the hole blocking layer is a layer for blocking holes generated in the photoelectric conversion layer from flowing to the cathode side and recombining with electrons. Depending on the type of material constituting each layer, insertion of this layer suppresses recombination of holes and electrons and improves photoelectric conversion efficiency.
- the hole blocking material preferably has a HOMO level lower in energy than the photoelectric conversion material.
- preferable hole blocking materials capable of efficiently blocking the movement of holes from the photoelectric conversion layer include quinolinol derivative metal complexes represented by 8-hydroxyquinoline aluminum; tropolone metal complexes, flavonol metal complexes, and perylenes.
- the electron blocking layer is a layer for blocking electrons generated in the photoelectric conversion layer from flowing to the anode side and recombining with holes. Depending on the type of material constituting each layer, insertion of this layer suppresses recombination of holes and electrons and improves photoelectric conversion efficiency.
- the electron blocking material preferably has an LUMO level higher in energy than the photoelectric conversion material.
- N, N′-diphenyl-N, N′-bis (3-methylphenyl) -4,4′- Triphenylamines such as diphenyl-1,1′-diamine, N, N′-bis (1-naphthyl) -N, N′-diphenyl-4,4′-diphenyl-1,1′-diamine; N-allylcarbazole) or bis (N-alkylcarbazole) s, pyrazoline derivatives, stilbene compounds, distyryl derivatives, hydrazone compounds; heterocyclic compounds represented by oxadiazole derivatives, phthalocyanine derivatives, porphyrin derivatives; Polycarbonate, styrene derivative, polyvinyl carbazole, polysilane, etc.
- These electron blocking materials are used alone, but two or more kinds of electron blocking materials may be laminated or mixed.
- the hole blocking layer and the electron blocking layer are made of polyvinyl chloride, polycarbonate, polystyrene, poly (N-vinylcarbazole), polymethyl methacrylate, polybutyl methacrylate, polyester, polysulfone, polyphenylene oxide, polybutadiene, Solvent-soluble resins such as hydrocarbon resin, ketone resin, phenoxy resin, polysulfone, polyamide, ethyl cellulose, vinyl acetate, ABS resin, polyurethane resin; phenol resin, xylene resin, petroleum resin, urea resin, melamine resin, unsaturated polyester resin In addition, it can be used by being dispersed in a curable resin such as an alkyd resin, an epoxy resin, or a silicone resin.
- a curable resin such as an alkyd resin, an epoxy resin, or a silicone resin.
- the method for forming the organic layer is not particularly limited, such as resistance heating evaporation, electron beam evaporation, sputtering, molecular lamination method, coating method, etc., but resistance heating evaporation or electron beam evaporation is preferable in terms of characteristics.
- the thickness of each organic layer is influenced by the resistance value of the organic substance, but is preferably between 1 and 1000 nm.
- the photoelectric conversion element of this invention contains the compound represented by General formula (1) in an organic layer.
- R 1 to R 4 are an alkyl group, a cycloalkyl group, an alkoxy group, or an aryl ether group, and may be the same or different.
- R 5 and R 6 are halogen, hydrogen or an alkyl group, and may be the same or different.
- R 7 is an aryl group, heteroaryl group or alkenyl group.
- M represents an m-valent metal and is at least one metal selected from boron, beryllium, magnesium, aluminum, chromium, iron, nickel, copper, zinc, and platinum.
- L is a group selected from halogen, hydrogen, an alkyl group, an aryl group and a heteroaryl group.
- m is 1 to 6, and when m ⁇ 1 is 2 or more, each L may be the same as or different from each other.
- hydrogen may be deuterium
- the alkyl group represents a saturated aliphatic hydrocarbon group such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, or a tert-butyl group. Furthermore, it may or may not have a substituent. There is no restriction
- the number of carbon atoms of the alkyl group is not particularly limited, but is preferably 1 or more and 20 or less, more preferably 1 or more and 8 or less, from the viewpoint of availability and cost.
- the cycloalkyl group represents, for example, a saturated alicyclic hydrocarbon group such as cyclopropyl, cyclohexyl, norbornyl, adamantyl, etc., which may or may not have a substituent.
- the number of carbon atoms in the alkyl group moiety is not particularly limited, but is preferably in the range of 3 or more and 20 or less.
- alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group, or a butadienyl group, which may or may not have a substituent.
- carbon number of an alkenyl group is not specifically limited, Preferably it is the range of 2-20.
- the alkoxy group refers to, for example, a functional group having an aliphatic hydrocarbon group bonded through an ether bond such as a methoxy group, an ethoxy group, or a propoxy group, and the aliphatic hydrocarbon group may have a substituent. It may not have.
- carbon number of an alkoxy group is not specifically limited, Preferably it is the range of 1-20.
- An aryl ether group refers to a functional group to which an aromatic hydrocarbon group is bonded via an ether bond, such as a phenoxy group, and the aromatic hydrocarbon group may or may not have a substituent. Good. Although carbon number of an aryl ether group is not specifically limited, Preferably, it is the range of 6-40.
- Halogen means fluorine, chlorine, bromine or iodine.
- An aryl group refers to an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, a biphenyl group, a fluorenyl group, a phenanthryl group, a triphenylenyl group, or a terphenyl group.
- the aryl group may or may not have a substituent. Although carbon number of an aryl group is not specifically limited, Preferably, it is the range of 6-40.
- a heteroaryl group is one or more atoms other than carbon such as furanyl, thiophenyl, pyridyl, quinolinyl, pyrazinyl, pyrimidinyl, triazinyl, naphthyridyl, benzofuranyl, benzothiophenyl, indolyl, etc.
- the cyclic aromatic group which has in an individual ring is shown, This may be unsubstituted or substituted.
- carbon number of heteroaryl group is not specifically limited, Preferably it is the range of 2-30.
- R 1 to R 4 are preferably alkyl groups that do not extend the conjugation of the pyromethene skeleton of the general formula (1) and do not affect the absorption wavelength.
- alkyl groups a methyl group or a t-butyl group is more preferable because of excellent thermal stability.
- a methyl group is particularly preferably used because of ease of synthesis.
- an alkyl group or hydrogen is preferable from the viewpoint of thermal stability, and hydrogen is more preferable because a narrow half-value width is easily obtained in the absorption spectrum.
- M is preferably at least one selected from the group consisting of boron, beryllium, magnesium, aluminum, chromium, iron, nickel, copper, zinc and platinum. Boron is particularly preferred from the viewpoint of giving a sharp spectrum and obtaining a higher absorption coefficient.
- M is boron, m is 3 (m ⁇ 1 is 2).
- L is a monovalent or zero-valent group that is bonded to M through one or two atoms in the molecule.
- zero valence means, for example, a case where L is a pyridyl group and is coordinated to M through an unshared electron pair.
- bonds with M through two atoms means what is called a chelate coordination.
- the description of the alkyl group, aryl group and heteroaryl group is as described above.
- L is preferably a group selected from fluorine, a fluorine-containing aryl group, a fluorine-containing heteroaryl group and a fluorine-containing alkyl group, and a higher fluorescence quantum yield is obtained. More preferably, it is a group. L is more preferably fluorine in view of ease of synthesis.
- the fluorine-containing aryl group is an aryl containing fluorine, and examples thereof include a fluorophenyl group, a trifluoromethylphenyl group, and a pentafluorophenyl group.
- the fluorine-containing heteroaryl group is a heteroaryl group containing fluorine, and examples thereof include a fluoropyridyl group, a trifluoromethylpyridyl group, and a trifluoropyridyl group.
- the fluorine-containing alkyl group is an alkyl group containing fluorine, and examples thereof include a trifluoromethyl group and a pentafluoroethyl group.
- L is preferably a chelate ligand.
- R 7 is preferably a group selected from an aryl group and a heteroaryl group from the viewpoint of obtaining a higher absorption coefficient and higher heat resistance, and more preferably an aryl group from the viewpoint of the absorption coefficient. Furthermore, R 7 is preferably a bulky substituent. Since R 7 is bulky, aggregation of molecules can be prevented, so that high photoelectric conversion efficiency can be obtained stably over time.
- a preferable example of such a bulky substituent is a structure represented by the following general formula (2).
- R 8 is an aryl group or a heteroaryl group.
- the description of the aryl group and heteroaryl group is as described above.
- l is an integer of 1 to 3.
- R 8 may be the same or different. More specifically, R 8 is preferably a group represented by any one of the following general formulas (3) to (5).
- R 9 to R 12 are an alkyl group, an aryl group, or a heteroaryl group.
- the description of the alkyl group, aryl group and heteroaryl group is as described above.
- Alkyl groups are more preferably used in that higher photoelectric conversion efficiency can be obtained, and methyl groups and tert-butyl groups are particularly preferred because they prevent molecular aggregation.
- R 8 is more preferably a group represented by the general formula (5).
- the compound represented by the general formula (1) can be produced, for example, by the method described in JP-T-8-509471 and JP-A-2000-208262. That is, the target pyromethene metal complex is obtained by reacting a pyromethene compound and a metal salt in the presence of a base.
- R 7 can be obtained by introducing various aryl groups and heteroaryl groups.
- the compound represented by the general formula (1) is used in a photoelectric conversion layer in a photoelectric conversion element. Furthermore, when the photoelectric conversion layer is composed of two types of photoelectric conversion element materials having an electron donating property and an electron accepting relationship, the compound represented by the general formula (1) functions as an n-type organic semiconductor material. .
- An image sensor is a semiconductor element that converts an optical image into an electrical signal.
- an image sensor includes the photoelectric conversion element that converts light into electric energy and a circuit that reads the electric energy into an electric signal.
- a plurality of photoelectric conversion elements can be arranged in a one-dimensional straight line or a two-dimensional plane.
- a photoelectric conversion element that detects red light a photoelectric conversion element that detects green light, and a photoelectric conversion element that detects blue light are included.
- Each color photoelectric conversion element may have a stacked structure, that is, a structure in which a plurality of photoelectric conversion elements are stacked in one pixel, or a matrix structure in which a plurality of photoelectric conversion elements are arranged side by side. Also good.
- a photoelectric conversion element 32 that detects green light, a photoelectric conversion element 33 that detects blue light, and a red light are detected.
- a three-layer structure in which the photoelectric conversion elements 31 are sequentially stacked may be used.
- a photoelectric conversion element 32 that detects green light is disposed on the entire upper surface, and the photoelectric conversion element 31 that detects red light and blue light is detected.
- the photoelectric conversion element 33 to be formed may have a two-layer structure in which a lower layer is formed in a matrix structure. In these structures, a photoelectric conversion element that detects green light is arranged in a layer closest to incident light.
- the arrangement of photoelectric conversion elements in the case of a matrix structure can be selected from an array such as a Bayer array, a honeycomb array, a stripe array, and a delta array.
- the compound represented by the general formula (1) has a sharp absorption spectrum in the green region, when used as a photoelectric conversion element material of a green photoelectric conversion element, green light is selectively emitted. Can be absorbed to transmit red light and blue light.
- the green photoelectric conversion element is provided as the uppermost layer, that is, the layer closest to the incident light. In the device, detection noise of red light and blue light can be extremely reduced. Further, since the green photoelectric conversion element absorbs less red light and blue light, the lower red and blue photoelectric conversion elements can detect light with extremely high sensitivity. Therefore, it is possible to provide a color image sensor excellent in color separation.
- each color is not limited to this, and may be different from that shown in FIG.
- a configuration in which the conversion element is arranged in the uppermost layer is preferable.
- the blue photoelectric conversion element may be arranged in the uppermost layer from the viewpoint of easy detection of a short wavelength.
- the photoelectric conversion element of the present invention is used as a photoelectric conversion element for detecting green light, and a photoelectric conversion element for detecting red light and a photoelectric conversion element for detecting blue light are conventionally used as inorganic photoelectric elements. You may use it combining suitably from a conversion material and an organic photoelectric conversion material.
- the absorption spectrum of the compound was measured by using a U-3200 spectrophotometer (manufactured by Hitachi, Ltd.) and depositing a measurement sample on a quartz substrate with a film thickness of 50 nm.
- the absorption coefficient was calculated by Lambert-Beer Law.
- Synthesis example 1 Synthesis method of compound [1] 3,5-dibromobenzaldehyde (3.0 g), 4-t-butylphenylboronic acid (5.3 g), tetrakis (triphenylphosphine) palladium (0) (0.4 g), carbonic acid Potassium (2.0 g) was placed in the flask and purged with nitrogen. Degassed toluene (30 mL) and degassed water (10 mL) were added thereto, and the mixture was refluxed for 4 hours. The reaction solution was cooled to room temperature, and the organic layer was separated and washed with saturated brine. The organic layer was dried over magnesium sulfate and filtered, and then the solvent was distilled off. The obtained reaction product was purified by silica gel chromatography to obtain 3,5-bis (4-tert-butylphenyl) benzaldehyde (3.5 g) as a white solid.
- the light absorption characteristic of the compound [1] was as follows. Absorption spectrum: ⁇ max 514 nm (thin film: 50 nm) Half width: 39 nm Absorption coefficient: 1.21 ⁇ 10 5 / cm
- Example 1 A photoelectric conversion element using the compound [1] was produced as follows.
- a glass substrate manufactured by Asahi Glass Co., Ltd., 15 ⁇ / ⁇ , electron beam vapor-deposited product
- ITO transparent conductive film was deposited to 150 nm was cut into 30 ⁇ 40 mm and etched to obtain an anode substrate.
- the obtained anode substrate was subjected to ultrasonic cleaning for 15 minutes each using acetone and “Semicoclean (registered trademark) 56” (manufactured by Furuuchi Chemical Co., Ltd.) and then with ultrapure water.
- Comparative Example 1 A photoelectric conversion element was produced in the same manner as in Example 1 except that A-1 was used instead of the compound [1] when the photoelectric conversion layer was deposited.
- FIG. 9 and FIG. 10 show the spectral sensitivity characteristics when a bias voltage ( ⁇ 3 V) is applied to the photoelectric conversion elements of Example 1 and Comparative Example 1, respectively.
- Spectral sensitivity characteristics are measured by using a spectral sensitivity measuring device (SM-250, manufactured by Spectrometer Co., Ltd.) and determining the output current when the photoelectric conversion element is irradiated with monochromatic light from 400 nm to 700 nm. went.
- SM-250 spectral sensitivity measuring device
- photoelectric conversion could be performed with high selectivity in a green region having a wavelength of 450 nm or more and 550 nm or less.
- the blue region having a wavelength of less than 450 nm and the red region having a wavelength longer than 550 nm were also photoelectrically converted, resulting in poor color selectivity.
- Examples 2 to 3 A photoelectric conversion element was produced in the same manner as in Example 1 except that the vapor deposition rate ratio of Compound D-1 and Compound [1] was changed to 2: 1 and 3: 1, respectively.
- Table 1 shows photoelectric conversion characteristics when a bias voltage ( ⁇ 5 V) is applied to each photoelectric conversion element. All the elements exhibited photoelectric conversion characteristics with good color selectivity.
- Example 4 to 10 Comparative Example 2 A photoelectric conversion element was produced in the same manner as in Example 1 except that the compound shown below was used as the n-type semiconductor material instead of the compound [1]. Table 1 shows photoelectric conversion characteristics when a bias voltage ( ⁇ 5 V) is applied to each photoelectric conversion element. In Examples 4 to 10, the half width of the absorption spectrum was small and the color selectivity was good. However, in Comparative Example 2, the half width of the absorption spectrum was large and the color selectivity was deteriorated.
- the photoelectric conversion element of the present invention can be applied to fields such as image sensors and solar cells. Specifically, it can be used in fields such as image sensors mounted on mobile phones, smartphones, tablet computers, digital still cameras, and sensing devices such as photovoltaic generators and visible light sensors.
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Abstract
Description
本発明の光電変換素子は、第一電極と第二電極の間に少なくとも一層の有機層が存在し、光を電気エネルギーに変換する光電変換素子であって、前記有機層に後述の一般式(1)で表される化合物を含有するものである。
光電変換素子において、陽極と陰極は、素子の中で作られた電子および正孔を流し、十分に電流を流せるための役割を有する。陽極と陰極は、光電変換層に光を入射させるために、少なくとも一方は透明または半透明であることが望ましい。通常、基板上に形成される陽極を透明電極とすることが好ましい。
光電変換層は、単独の光電変換素子材料から構成されていても良いが、高い光電変換効率を得るためには2種類以上の光電変換素子材料から構成されることが好ましく、電子供与性の光電変換素子材料と電子受容性の光電変換素子材料から構成されることがより好ましい。光電変換層が2種以上の光電変換素子材料から構成される場合、該光電変換層は、2種以上の光電変換素子材料が混合された1層でもよいし、それぞれ1種以上の光電変換素子材料からなる層が積層された複数層でもよい。さらには、混合層と各々の単独層が混合された構成でも良い。
電荷阻止層とは、光電変換層で光電変換された電子および正孔を効率良くかつ安定に電極から取り出すために用いられる層であり、電子を阻止する電子阻止層と正孔を阻止する正孔阻止層とが挙げられる。これらは無機物から構成されても良いし、有機化合物から構成されても良い。さらに、無機物と有機化合物の混合層からなってもよい。
本発明の光電変換素子は、有機層に一般式(1)で表される化合物を含有する。
イメージセンサは、光学的な映像を電気的な信号に変換する半導体素子である。一般的にイメージセンサは、光を電気エネルギーに変換する前述の光電変換素子と電気エネルギーを電気信号に読み出す回路で構成される。イメージセンサの用途によって、複数の光電変換素子を一次元直線または二次元平面に配列することができる。また、モノカラーのイメージセンサの場合は、1種の光電変換素子のみを有していてもよいが、カラーイメージセンサの場合は、2種以上の光電変換素子を有する。例えば赤色光を検出する光電変換素子、緑色光を検出する光電変換素子、および青色光を検出する光電変換素子を有する。各色の光電変換素子は、積層構造、すなわち一つの画素に複数の光電変換素子が積層された構造で構成されていてもよいし、複数の光電変換素子が横に並んだマトリクス構造で構成されてもよい。
化合物[1]の合成方法
3,5-ジブロモベンズアルデヒド(3.0g)、4-t-ブチルフェニルボロン酸(5.3g)、テトラキス(トリフェニルホスフィン)パラジウム(0)(0.4g)、炭酸カリウム(2.0g)をフラスコに入れ、窒素置換した。ここに脱気したトルエン(30mL)および脱気した水(10mL)を加え、4時間還流した。反応溶液を室温まで冷却し、有機層を、分液した後に飽和食塩水で洗浄した。この有機層を硫酸マグネシウムで乾燥し、ろ過後、溶媒を留去した。得られた反応生成物をシリカゲルクロマトグラフィーにより精製し、3,5-ビス(4-t-ブチルフェニル)ベンズアルデヒド(3.5g)を白色固体として得た。
1H-NMR(CDCl3,ppm):7.95(s,1H)、7.63-7.48(m,10H)、6.00(s,2H)、2.58(s,6H)、1.50(s,6H)、1.37(s,18H)。
吸収スペクトル:λmax514nm(薄膜:50nm)
半値幅:39nm
吸収係数:1.21×105/cm
石英基板上に下記に示す化合物D-1と上記化合物[1]を蒸着速度比1:1で50nm蒸着した。蒸着膜の吸収スペクトルを測定した結果、図5に示すように緑色領域のみに吸収を持つシャープな吸収スペクトルとなった。また、光吸収特性は以下の通りであった。
吸収スペクトル:λmax514nm
半値幅:39nm
吸収係数:7.42×104/cm
化合物[1]の代わりにA-1を用いたこと以外は、合成例1と同様の方法で化合物D-1と化合物A-1を石英基板上に蒸着し、吸収スペクトルを測定した。図6に示すように緑領域だけでなく、赤領域および青領域にも吸収を持つブロードな吸収スペクトルとなった。また、光吸収特性は以下の通りであった。
吸収スペクトル:λmax529nm
半値幅:142nm
吸収係数:9.06×104/cm。
化合物[1]を用いた光電変換素子を次のように作製した。ITO透明導電膜を150nm堆積させたガラス基板(旭硝子(株)製、15Ω/□、電子ビーム蒸着品)を30×40mmに切断し、エッチングを行い、陽極基板を得た。得られた陽極基板をアセトンおよび”セミコクリーン(登録商標)56”(フルウチ化学(株)製)を用いて、各々15分間超音波洗浄してから、超純水で洗浄した。続いて、イソプロピルアルコールを用いて15分間超音波洗浄し、さらに熱メタノールに15分間浸漬させた後、乾燥した。この陽極基板を、素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-5Pa以下になるまで排気した。この陽極基板のITO層上に、抵抗加熱法によって、電子阻止層として酸化モリブデンを30nm蒸着した。次に、光電変換層として化合物D-1と化合物[1]を蒸着速度比1:1で共蒸着した。次に、アルミニウムを100nm蒸着して陰極とし、5×5mm角の素子を得た。ここで言う膜厚は、水晶発振式膜厚モニター表示値である。
光電変換層を蒸着する時、化合物[1]の代わりにA-1を用いた以外は実施例1と同様にして光電変換素子を作製した。
化合物D-1と化合物[1]の蒸着速度比を、それぞれ2:1、3:1に変更したこと以外は、実施例1と同様にして光電変換素子を作製した。各光電変換素子にバイアス電圧(-5V)を印加したときの光電変換特性を表1に示す。いずれの素子においても、色選択性が良好な光電変換特性を示した。
化合物[1]の代わりにn型半導体材料として下記に示す化合物を用いた以外は、実施例1と同様にして光電変換素子を作製した。各光電変換素子にバイアス電圧(-5V)を印加したときの光電変換特性を表1に示す。実施例4~10においては、吸収スペクトルの半値幅が小さく色選択性が良好であったが、比較例2においては吸収スペクトルの半値幅が大きく、色選択性が悪化した。
13 電子阻止層
15 光電変換層
17 正孔阻止層
20 第二電極
30 光
31 赤色光を検出する光電変換素子
32 緑色光を検出する光電変換素子
33 青色光を検出する光電変換素子
Claims (13)
- 第一電極と第二電極の間に少なくとも一層の有機層が存在し、光を電気エネルギーに変換する光電変換素子であって、前記有機層に一般式(1)で表される化合物を含有する光電変換素子;
- 一般式(1)のR1~R4がメチル基であり、R5およびR6が水素である請求項1記載の光電変換素子。
- 一般式(1)のMがホウ素、Lがフッ素または含フッ素アリール基、m-1が2である請求項1または2記載の光電変換素子。
- 一般式(1)のR7がアリール基またはヘテロアリール基である請求項1~3いずれか記載の光電変換素子。
- 前記有機層が光電変換層を含み、該光電変換層に前記一般式(1)で表される化合物を含有する請求項1~5いずれか記載の光電変換素子。
- 前記光電変換層が2種類の光電変換素子材料で構成されており、そのうちの1種類が前記一般式(1)で表される化合物である請求項6記載の光電変換素子。
- 前記2種類の光電変換素子材料がそれぞれ電子供与性および電子受容性の光電変換素子材料であり、前記一般式(1)で表される化合物が電子受容性の光電変換素子材料である請求項7記載の光電変換素子。
- 請求項1~8いずれか記載の光電変換素子を含むイメージセンサ。
- 2種類以上の光電変換素子を有し、そのうちの1種類の光電変換素子が請求項1~8いずれか記載の光電変換素子である請求項9記載のイメージセンサ。
- 前記2種類以上の光電変換素子が積層構造を有する請求項10記載のイメージセンサ。
- 赤色光、緑色光および青色光を検出する光電変換素子を有し、該緑色光を検出する光電変換素子が請求項1~8いずれか記載の光電変換素子である請求項11記載のイメージセンサ。
- 前記緑色光を検出する光電変換素子が入射光に対して最も近い層に配置されている請求項12記載のイメージセンサ。
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CN109661599B (zh) * | 2016-09-05 | 2021-08-10 | 东丽株式会社 | 颜色转换片、包含其的发光体、照明装置 |
JP2020072270A (ja) * | 2018-10-31 | 2020-05-07 | 三星電子株式会社Samsung Electronics Co.,Ltd. | 有機化合物とそれを含む有機光電素子、イメージセンサ、及び電子素子 |
KR20200049485A (ko) * | 2018-10-31 | 2020-05-08 | 삼성전자주식회사 | 유기 화합물과 이를 포함하는 유기 광전 소자, 이미지 센서, 및 전자 소자 |
JP7397621B2 (ja) | 2018-10-31 | 2023-12-13 | 三星電子株式会社 | 有機化合物とそれを含む有機光電素子、イメージセンサ、及び電子素子 |
KR102683412B1 (ko) * | 2018-10-31 | 2024-07-10 | 삼성전자주식회사 | 유기 화합물과 이를 포함하는 유기 광전 소자, 이미지 센서, 및 전자 소자 |
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KR20160119052A (ko) | 2016-10-12 |
TW201532255A (zh) | 2015-08-16 |
JP6558243B2 (ja) | 2019-08-14 |
JPWO2015119039A1 (ja) | 2017-03-23 |
CN105960714B (zh) | 2018-02-09 |
KR20210062098A (ko) | 2021-05-28 |
KR102480671B1 (ko) | 2022-12-23 |
TWI646673B (zh) | 2019-01-01 |
CN105960714A (zh) | 2016-09-21 |
US20160351810A1 (en) | 2016-12-01 |
KR20220054465A (ko) | 2022-05-02 |
US9842884B2 (en) | 2017-12-12 |
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