WO2009013282A1 - Photovoltaische tandem-zelle - Google Patents
Photovoltaische tandem-zelle Download PDFInfo
- Publication number
- WO2009013282A1 WO2009013282A1 PCT/EP2008/059565 EP2008059565W WO2009013282A1 WO 2009013282 A1 WO2009013282 A1 WO 2009013282A1 EP 2008059565 W EP2008059565 W EP 2008059565W WO 2009013282 A1 WO2009013282 A1 WO 2009013282A1
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- WO
- WIPO (PCT)
- Prior art keywords
- solar cell
- photovoltaic element
- dye
- electrode
- layer
- Prior art date
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- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- CXZRDVVUVDYSCQ-UHFFFAOYSA-M pyronin B Chemical compound [Cl-].C1=CC(=[N+](CC)CC)C=C2OC3=CC(N(CC)CC)=CC=C3C=C21 CXZRDVVUVDYSCQ-UHFFFAOYSA-M 0.000 description 1
- 239000001044 red dye Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000001016 thiazine dye Substances 0.000 description 1
- CZDVJGBXKADLCY-UHFFFAOYSA-N thieno[3,4-b]pyrazine Chemical compound N1=CC=NC2=CSC=C21 CZDVJGBXKADLCY-UHFFFAOYSA-N 0.000 description 1
- 125000005309 thioalkoxy group Chemical group 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 150000003643 triphenylenes Chemical class 0.000 description 1
- 150000004961 triphenylmethanes Chemical class 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- BNEMLSQAJOPTGK-UHFFFAOYSA-N zinc;dioxido(oxo)tin Chemical compound [Zn+2].[O-][Sn]([O-])=O BNEMLSQAJOPTGK-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2068—Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells
- H01G9/2072—Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells comprising two or more photoelectrodes sensible to different parts of the solar spectrum, e.g. tandem cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/10—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising heterojunctions between organic semiconductors and inorganic semiconductors
- H10K30/15—Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2
- H10K30/151—Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2 the wide bandgap semiconductor comprising titanium oxide, e.g. TiO2
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/20—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising organic-organic junctions, e.g. donor-acceptor junctions
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/50—Photovoltaic [PV] devices
- H10K30/57—Photovoltaic [PV] devices comprising multiple junctions, e.g. tandem PV cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2004—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte
- H01G9/2009—Solid electrolytes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
- H10K85/1135—Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/20—Carbon compounds, e.g. carbon nanotubes or fullerenes
- H10K85/211—Fullerenes, e.g. C60
- H10K85/215—Fullerenes, e.g. C60 comprising substituents, e.g. PCBM
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/621—Aromatic anhydride or imide compounds, e.g. perylene tetra-carboxylic dianhydride or perylene tetracarboxylic di-imide
-
- 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
- Y02E10/542—Dye sensitized solar cells
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the invention relates to a photovoltaic element with a tandem cell structure according to the preamble of claim 1.
- Such photovoltaic elements are used to convert electromagnetic radiation, in particular sunlight, into electrical energy.
- the direct conversion of solar energy into electrical energy in solar cells is usually based on the so-called "internal photoelectric effect" of a semiconductor material, ie the generation of electron-hole pairs by absorption of photons and the separation of the negative and positive charge carriers at a pn junction In this way, a photovoltage is generated, which can cause a photocurrent in an external circuit, through which the solar cell gives off its power.
- Dye Solar Cell has been one of the most efficient alternative solar cell technologies to date. Efficiencies of up to 11% are currently achieved in a liquid variant of this technology (see, for example, Grätzel M. et al., J. Photochem., Photobio C, 2003, 4, 145; Chiba et al., Japanese Journal of Appl. Phys., 2006, 45, L638-L640).
- Dye-type solar cells constructed as individual elements, of which there are now several variants, generally have two electrodes, of which at least one is transparent. The two electrodes are designated according to their function as “working electrode” (also "anode", generation of electrons) and “counter electrode” (also "cathode”).
- an n-type metal oxide for example, an approximately 10-20 microns thick, nanoporous layer of titanium dioxide (TiO 2 ).
- a monolayer of a light-sensitive dye for example, a ruthenium complex
- a light-sensitive dye for example, a ruthenium complex
- a ruthenium complex On or at the counter electrode is often a few microns thick catalytic layer, such as platinum.
- the area between the two electrodes is filled with a redox electrolyte, eg a solution of iodine (I 2 ) and potassium iodide (KI).
- the function of the dye solar cell is based on the fact that light is absorbed by the dye. From the excited dye, electrons are transferred to the n-type semiconducting metal oxide semiconductor and migrate therefrom to the anode, whereas the electrolyte provides for charge balance across the cathode.
- the n-type semiconducting metal oxide, the dye and the electrolyte are therefore the essential constituents of the dye-sensitized solar cell.
- liquid electrolyte dye-sensitized cell often suffers from a non-optimal seal, which can lead to stability problems.
- the liquid electrolyte can be replaced by a solid p-type semiconductor.
- the efficiency of the solid variant of the dye-sensitized solar cell is currently about 4.6-4.7% (Snaith, H., Angew Chem. Int Ed., 2005, 44, 6413-6417).
- p-type semiconductors such as CuI, CuBr • 3 (S (C 4 Hg) 2 ) or CuSCN have been used in solid-color dye solar cells. In nature, too, it is the Cu (I) enzyme plastocyanin that reduces the oxidized chlorophyll dimer in photosystem I again.
- Such p-type semiconductors can be processed by at least three different methods, namely: from a solution, by electrode position or by laser deposition.
- Organic polymers have also been used as solid p-type semiconductors.
- examples thereof include polypyrrole, poly (3,4-ethylenedioxythiophene), carbazole-based polymers, polyaniline, poly (4-undecyl-2,2'-bithiophene), poly (3-octylthiophene), poly (triphenyldiamine), and poly (N-vinylcarbazole).
- the efficiencies reach up to 2% in the case of poly (N-vinylcarbazole).
- An in-situ polymerized PEDOT poly (3,4-ethylenedioxythiophene) has also shown an efficiency of 0.53%
- the polymers described here are typically not used in their pure form but with additives.
- Low molecular mass organic p-semiconductors can also be used.
- the first use of a low-molecular-weight p-type semiconductor in solid-color dye solar cells replaced the liquid electrolyte with a vapor-deposited layer of triphenylamine (TPD).
- TPD triphenylamine
- the use of the organic compound 2,27,7'-tetrakis (N, N-di-p-methoxyphenylamine) -9,9'-spirobifluorene (spiro-MeOTAD) in dye-sensitized solar cells was reported in 1998. It can be brought in from a solution and has a relatively high glass transition temperature, which prevents unwanted crystallization and poor contact with the dye.
- the methoxy groups adjust the oxidation potential of the Spiro-MeOTAD so that the Ru complex can be efficiently regenerated.
- IPCE maximum incident photocon to current conversion efficiency
- an indoline dye is proposed for dye-containing solar cells with spirobifluorenes as the amorphous organic p-conductor.
- This organic dye which has a four-fold higher extinction coefficient than a ruthenium complex, shows high efficiency (4.1% for a sun) in solid dye-sensitizer cells.
- a disadvantage of the dye-sensitized solar cell is that the amount of light that can be used by the dye is limited by the energetic distance between the Fermi energies of the n- and p-type conductors used. The photovoltage is also limited by this distance.
- dye solar cells generally have to be made comparatively thin (for example 1-2.5 micrometers) due to the required charge transport, so that the utilization of the incident light is generally not optimal.
- Photovoltaic elements based on a pn junction in which some or even all of the photoactive materials are organic have been known for almost 50 years (see, eg, Kearns, K, Calvin, M., J., Chem. Phys. 1958, 29, 950-951). Such elements are designed in such a way that at least one of the semiconductors (n-semiconductors and / or p-semiconductors) absorbs a photon, whereby the resulting exciton is transported to the pn-junction and from there one or both of the two charges is transported to the electrode or be.
- Organic solar cells can be composed of low molecular weight compounds (also referred to below as “low molecular weight cells”), of polymers (also referred to below as “polymer cells”), of oligomers or of combinations of some or more of these materials.
- Organic solar cells have at least one An acceptor on which dominates the n-charge transport (electron transport) and which thus represents the organic analogue to an n-type semiconductor and at least one donor material in which the p-charge transport (hole transport) dominates and which thus the organic analogue to a p- Semiconductor represents.
- inorganic nanoparticles can also be used as acceptor (see, for example, Alivisatos A., Science, 2002, 295, 2425-2427).
- the variety of organic photovoltaic concepts can be ordered by processing methods for purposes of this description.
- the materials are typically vacuum deposited (e.g., by physical vapor deposition, PVD, chemical vapor deposition, CVD, molecular beam epitaxy or other methods or combinations of techniques) and / or deposited from solution (e.g., by spin coating, printing, or other wet chemical technologies).
- PVD physical vapor deposition
- CVD chemical vapor deposition
- molecular beam epitaxy or other methods or combinations of techniques e.g., by spin coating, printing, or other wet chemical technologies.
- solution e.g., by spin coating, printing, or other wet chemical technologies.
- hybrids of these cell types and deposition methods for example cells with low molecular weight, vacuum-applied layers and polymeric, wet-chemically applied layers.
- a so-called “bulk heterojunction” increases the interface between n- and p-type material, which separates an increased amount of excitons into a free hole and an electron and can lead to a current.
- an exciton blocking layer is inserted between the acceptor layer and the cathode.
- This layer should cause the excitons do not migrate to the cathode, where they would decay unused at the transition between metal and organic layers.
- these blocking layers also serve as diffusion barrier against penetration of the electrode into the photoactive material.
- oligothiophenes eg ⁇ , ⁇ '-bis (2,2-dicyanovinyl) quinquethiophenes, DCV5T
- C ⁇ o acceptor material
- oligothiophenes eg ⁇ , ⁇ '-bis (2,2-dicyanovinyl) quinquethiophenes, DCV5T
- C ⁇ o acceptor material
- efficiencies eg 3.4-3.8%, cf. Schulze et al., Adv. Mater., 2006, 18, 2872-2875; Schulze et al., Proc. Of SPIE Vol. 6192, 61920C-1 (2006).
- a recent work uses so-called "Tripletf absorbers, which have a high exciton diffusion length (Yang, Y. Adv. Mater., 2005, 17, 2841).
- Polymer cells function on the same principle as the low molecular weight cells described above. The difference is that at least one of the two absorbers (ie, acceptor material and / or donor material) is a polymer and therefore is typically processed from the solution.
- useful polymers are the derivatives of poly (p-phenylene-vinylene) (PPV), among which, depending on the substituents, both donor and acceptor materials are found.
- PPV poly (p-phenylene-vinylene)
- a typical example of a polymer acting as a donor material is MEH-PPV (methylhexyl-substituted PPV), whereas cyano-substituted PPV (CN-PPV) can act as an acceptor material. Efficiencies of such constructed polymer cells were in the range of 1%.
- B small band gap polymers such as PCPDTBT (poly (2,6- (4,4-bis (2-ethylhexyl) -4H-cyclopenta [2,1-b; 3,4-b ' ] -dithiophene) -a / M, 7- (2,1,3-benzothiadiazole)] together with C71-PCBM, which show an efficiency of up to 5.5%
- PCPDTBT poly (2,6- (4,4-bis (2-ethylhexyl) -4H-cyclopenta [2,1-b; 3,4-b ' ] -dithiophene) -a / M, 7- (2,1,3-benzothiadiazole)
- C71-PCBM which show an efficiency of up to 5.5%
- Polymers are also used as donor materials with inter alia perylenes or with inorganic nanorods as acceptor materials, with an efficiency up to 1, 7% in the latter case.
- Organic solar cells processed from a solution have the advantage of enabling a variety of low cost manufacturing processes suitable for high throughput.
- printing processes can be used for the production, such as, for example, ink-jet printing processes, which also enable structuring of the organic layers.
- tandem solar cells In order to make better use of the energy of the photons, so-called “tandem” concepts are suitable (see eg Meissner, D., solar cells, pages 129-136, Friedr.Vieweg & Sohn Verlagsgesellschaft mbH, 1993)
- Semiconductors are known and have high earth surface light intensity efficiencies Known examples of such tandem solar cells are: GalnP / GaAs / Ge (32% ⁇ 1.5), GalnP / GaAs (30.3%), GaAs / CIS (25.8%). ⁇ 1, 3) and a-Si / ⁇ c-Si (11.7% ⁇ 0.4) (Green, MA, Prog Photovolt, Res. Appl. 2006, 14, 455-461).
- tandem solar cells are advantageous in many cases, since the production costs of the cells are usually surface-dependent.
- the efficiency of the solar cells should therefore be as high as possible, which can be achieved by the tandem cells.
- both subcells are connected to one another via an optical coupler (eg glass or a transparent foil), each solar cell retaining its own electrical connections.
- optical coupler eg glass or a transparent foil
- the electrical contacting takes place for the current decrease at the upper front contact of the upper part cell and at the lower contact of the lower part cell, ie both subcells are directly electrically coupled.
- fewer layers are needed, so that lower reflection and absorption losses occur.
- this concept is less expensive due to the lower number of layers.
- the currents of both sub-cells must be adapted. Only then can the total of the individual voltages of the two sub-cells be obtained during operation (ie when the circuit is closed).
- first tandem solar cells which are based on polymer materials, in particular polymer tandem cells with two contacts (Hadipour, A., Adv. Func. Mater., 2006, 16, 1897). These components show an open-circuit photovoltage (Voc) of approximately 1.4 V. The measured values disclosed for these components show that the upper solar cell supplies a lower current than the lower solar cell. The total current of the tandem cell is limited by this discrepancy. Since the idle photovoltage of the tandem cell is the sum of both cells, the efficiency is better than that of each individual cell.
- the cell was constructed as follows: glass substrate / Cr (1 nm) / Au (15 nm) / PEDOT: PSS (60 nm) / PFDTBT (poly ((2,7- (9,9-dioctyl) -fluorene) -old -5,5- (4 ', 7'-di-2-thienyl-2', 1 ⁇ 3'-benzothiadiazole) and
- PCBM (1: 4) I LiF (0.5nm) / Al (0.5nm) / Au (15nm) / PEDOT: PSS (60nm) PTBEHT (poly (5,7-di-2-thienyl-2, 3-bis (3,5-di (2-ethylhexyloxy) phenyl) thieno [3,4-b] pyrazine ⁇ ) and PCBM (1: 4) / LiF (1nm) / Al (100nm).
- a tandem structure may be advantageous.
- the efficiency can be increased from about 5.0% to about 5.7% (Forrest et al., Applied Physics Letters, 2004, 85, 5757-5759 and WO 02/101838 ). It is noteworthy that in this design, the photovoltage is greater than 1V.
- the cell was constructed as follows: glass substrate / Indium Tin Oxide (ITO) / CuPc / CuPc: C 60 / C 60 / PTCBI / Ag / m-MTDATA (4,4 ', 4 "-tris ((3-methylphenyl) - ( phenyl) amino) triphenylamine) (p-doped with 5 mol% tetrafluoro-tetracyanoquinodimethane / CuPc / CuPC: C 60 / C 60 / BCP (bathocuproine) / Ag (100 nm).
- ITO Indium Tin Oxide
- CuPc / CuPc C 60 / C 60 / PTCBI / Ag / m-MTDATA (4,4 ', 4 "-tris ((3-methylphenyl) - ( phenyl) amino) triphenylamine) (p-doped with 5 mol% tetrafluoro-tetracyanoquino
- tandem cells with methyl perylenetetracarboxylic acid diimide (Me-PTC) and metal-free phthalocyanine (H 2 Pc) are also known (Hiramoto, M., Chem. Lett. 1990, 327, 1990). In these cells, however, the efficiency was still relatively low. Tandem solar cells, in which organic sub-cells are deposited on polymer sub-cells, are also known.
- a similar work used as photocathode is NiO / 3-carboxymethyl-5- [2- (3-octadecyl-2-benzothiazolinylidene) ethylidene] -2-thioxo-4-thiazolidine (Nakasa, A., Chem. Lett., 2005, 34 , 500, JP 2006147280).
- the efficiency increased to 0.78% and the maximum observed photovoltage to 0.918 V.
- the object of the present invention is therefore to provide a photovoltaic element which avoids the disadvantages of the above-described elements known from the prior art.
- the photovoltaic element should in particular have a high quantum efficiency and be easy to manufacture.
- This object is achieved by a photovoltaic element with the features of independent claim 1.
- the tandem cell structure comprises: a dye-sensitized solar cell having a first electrode, an n-type semiconducting metal oxide, a dye absorbing electromagnetic radiation in a first spectral range, and a solid p-type semiconductor; and an organic solar cell having an acceptor material and a donor material, wherein the acceptor material and / or the donor material comprises an organic material, wherein the organic solar cell further comprises a second electrode on an opposite side of the dye solar cell, wherein the organic solar cell is configured to electromagnetic radiation in a second spectral range which is at least partially different from the first spectral range,
- first electrode and / or the second electrode for the electromagnetic radiation is at least partially transparent.
- a "transparent" electrode is to be understood in particular as meaning that within the visible spectral range and / or in the range of the solar spectrum (about 300 nm to 2000 nm) there is a transmission of at least 50%, preferably of at least 80%.
- the present invention thus relates to the combination of the two main types of organic solar cells, namely dye solar cells with dye-sensitized metal oxides and the organic solar cells, which organic monomers, oligomers or polymers have (and optionally inorganic nanoparticles or other additives), wherein at least the acceptor material (n Semiconductor) or the donor material (p-type semiconductor) comprises an organic material.
- other cells may also be present, for example a structure in which, in addition to the combination of dye solar cell and organic solar cell, at least one further cell is present, for example a triple-cell structure ("triple-cell structure")
- a triple-cell structure (“triple-cell structure")
- a stacked, two-line structure is preferred, that is, a structure in which the above-described components (dye solar cell and organic solar cell) are superposed or arranged in layers.
- all materials used are solid materials.
- the dye solar cell is preferably used as the front, ie the irradiation side facing subcell, and the organic solar cell as the rear part cell.
- the acceptor material is preferably arranged on the side of the subcell facing the dye material solar cell, and the donor material is disposed on the side facing away from the dye solar cell.
- the dye-solar cell it is preferable (in terms of semiconductor language) within the organic solar cell to have an np junction instead of a pn junction.
- other structures are possible.
- the tandem cell structure can basically be realized as a four-contact structure.
- a two-contact structure preferably with only two electrodes, is preferred.
- the electrode which is in contact with the dye solar cell (working electrode of the dye solar cell) is preferably transparent.
- the first (transparent) electrode may be applied to an at least partially transparent support (e.g., a glass substrate and / or a plastic substrate, rigid or transparent). This can then be followed by the dye solar cell, followed by the organic solar cell, which in turn is followed by the (not necessarily transparent) second electrode as cover electrode or top electrode.
- the light to be converted into electrical energy then enters through the transparent support first in the dye solar cell is partially absorbed there (in particular by the dye), then enters the organic solar cell and is there again (preferably in an at least partially different spectral range) at least partially absorbed (of at least one of the organic materials, ie the acceptor material and / or the donor material and / or a separate absorber, for example a doped absorber).
- the organic materials ie the acceptor material and / or the donor material and / or a separate absorber, for example a doped absorber.
- other layer structures are conceivable, for example, inverted structures.
- the proposed structure has a number of advantages over known photovoltaic elements.
- long-wave light can be better utilized by the organic solar cell by making an appropriate selection of donor and acceptor materials.
- the donor and / or acceptor material can be chosen such that it absorbs in the near infrared region (NIR). This can lead to a better utilization of the solar spectrum and thus to a better efficiency.
- both sub-cells can be chosen such that they absorb complementary, which can achieve greatly increased efficiencies.
- the dye of the dye-sensitized solar cell has an absorption in the range between 400 nm and 700 nm, whereas it is preferred if the acceptor material and / or the donor material of the organic solar cell are chosen such that this one Have absorption in the range between 600 nm and 1000 nm.
- This choice is particularly preferred because the dye solar cells usually have to be made very thin (typically 1-2.5 microns), so that they can not always fully exploit the entire incident light. Especially this long-wave, little-used portion of the spectrum can be used efficiently in the mentioned choice of absorption of the organic solar cell by the tandem cell structure, which can significantly increase the overall efficiency of the structure.
- an advantage of the proposed structure in particular the use of a "solid electrolyte" with a p-type semiconductor instead of a liquid or gel-type electrolyte, lies in the fact that the partial flows of the two partial cells can be matched to one another comparatively easily.
- a disadvantage of known two-contact tandem cells is that the partial cell with the smaller current limits the total current, but with the proposed design the currents of the two can be adjusted (for example by adjusting the material parameters, selecting suitable absorbers and / or adjusting the layer thicknesses) In this way, an efficient element can be generated, in which the photovoltage of both sub-cells add up to a high total voltage.Furthermore, the proposed cell structure also avoids the above-mentioned disadvantages of those known from the prior art, double dye-sensitized tandem cell concepts using a liquid electrolyte by He, Hagfeldt et al. and by Nakasa et al.
- n-type semiconducting metal oxide of the dye solar cell a single metal oxide or a mixture of various oxides may be used. It is also possible to use mixed oxides.
- the n-semiconducting metal oxide can be used in particular as a noparticular oxide are used, wherein nanoparticles in this context are understood to mean particles which have an average particle size of less than 0.1 micrometers.
- a nanoparticulate oxide is usually applied to a conductive substrate (i.e., a carrier having a conductive layer as a first electrode) by a sintering process as a thin porous film having a large surface area.
- a conductive substrate i.e., a carrier having a conductive layer as a first electrode
- a substrate As a substrate (hereinafter also referred to as a support) are in addition to metal foils especially plastic sheets or films and glass plates in particular.
- conductive materials such as e.g. Transparent Conductive Oxide (TCO), for example, with fluorine and / or indium-doped tin oxide (FTO or ITO) and / or aluminum-doped zinc oxide (A-ZO), carbon nanotubes or metal films.
- TCO Transparent Conductive Oxide
- FTO or ITO fluorine and / or indium-doped tin oxide
- A-ZO aluminum-doped zinc oxide
- the substrate may be coated with these conductive materials.
- the first electrode in particular the TCO layer, can additionally be coated or coated with a (for example 10 to 200 nm thick) solid buffer layer, in particular a metal oxide buffer layer, in order to direct contact of the p-semiconductor with the TCO layer (see Peng et al., Coord. Chem. Rev. 248, 1479 (2004)).
- the buffer metal oxide which may be used in the buffer layer may comprise, for example, one or more of the following materials: vanadium oxide; a zinc oxide; a tin oxide; a titanium oxide.
- metal oxides are generally inexpensive solid semiconductor materials (n-type semiconductors), but their absorption due to large band gaps is usually not in the visible range of the electromagnetic spectrum but mostly in the ultraviolet spectral range.
- the metal oxides must generally, as is the case with the dye solar cells, be combined with a dye as a photosensitizer, which absorbs in the wavelength range of sunlight, ie at 300 to 2000 nm, and electrons in the electronically excited state injected into the conduction band of the semiconductor.
- the metal oxides can be used in the form of nanocrystalline porous layers. These layers have a large surface which is coated with the sensitizer, so that a high absorption of the sunlight is achieved.
- Metal oxide layers structured such as e.g. Nanorods (nanorods) offer advantages such as higher electron mobilities or improved pore filling by the dye.
- the metal oxide semiconductors can be used alone or in the form of mixtures. It is also possible to coat a metal oxide with one or more other metal oxides. Furthermore, the metal oxides may also be used as a coating on another semiconductor, e.g. GaP, ZnP or ZnS, be applied.
- another semiconductor e.g. GaP, ZnP or ZnS
- Particularly preferred semiconductors are zinc oxide and titanium dioxide in the anatase modification, which is preferably used in nanocrystalline form.
- the sensitizers can be advantageously combined with all the n-type semiconductors commonly used in these solar cells.
- Preferred examples are metal oxides used in the ceramic, such as titanium dioxide, zinc oxide, tin (IV) oxide, tungsten (VI) oxide, tantalum (V) oxide, niobium (V) oxide, cesium oxide, strontium titanate, zinc stannate, complex oxides of the perovskite type, eg barium titanate, and binary and ternary iron oxides, which may also be present in nanocrystalline or amorphous form.
- n-type semiconducting metal oxide Due to the strong absorption exhibited by conventional organic dyes as well as phthalocyanines and porphyrins, even thin layers or films of the n-type semiconducting metal oxide are sufficient to take up the required amount of dye. Thin metal oxide films in turn have the advantage that the probability of undesired recombination processes decreases and that the internal resistance of the dye subcell is reduced. Layer thicknesses of from 100 nm to 20 micrometers can preferably be used for the n-semiconducting metal oxide, more preferably in the range between 500 nm to about 3 micrometers.
- dye-sensitized solar cells based on titanium dioxide as the semiconductor material are e.g. in US-A-4,927,721, Nature 353, pp. 737-740 (1991) and US-A-5,350,644 and Nature 395, pp. 583-585 (1998) and EP-A-1,176,646.
- the dyes described in these documents can in principle also be used advantageously in the context of the present invention.
- These dye-sensitized solar cells contain monomolecular films of transition metal complexes, in particular ruthenium complexes, which are bonded to the titanium dioxide layer via acid groups as sensitizers.
- Sensitizers not least for reasons of cost, have repeatedly been proposed metal-free organic dyes which can also be used in the context of the present invention.
- US Pat. No. 6,359,211 also describes the use of cyanine, oxazine, thiazine and acridine dyes which can be used in the context of the present invention and which have carboxyl groups bonded via an alkylene radical for attachment to the titanium dioxide semiconductor.
- JP-A-10-189065, 2000-243463, 2001-093589, 2000-100484 and 10-334954 describe various perylene skeleton unsubstituted perylene-3,4: 9,10-tetracarboxylic acid derivatives for use in semiconductor solar cells. Specifically, they are: perylenetetracarboxylic diimides attached to the imide nitrogen atoms
- Particularly preferred sensitizing dyes in the proposed dye-sensitizing cell are the perylene derivatives, terrylene derivatives and quaterrylene derivatives described in DE 10 2005 053 995 A1 or WO 2007/054470 A1.
- the use of these dyes leads to photovoltaic elements with high efficiencies and high stabilities.
- the rylenes show strong absorption in the wavelength range of the sunlight and can, depending on the length of the conjugated system, a range of about 400 nm (perylene derivatives I from DE 10 2005 053 995 A1) up to about 900 nm (quaterrylene derivatives I from DE 10 2005 053 995 A1).
- Terylene-based rylene derivatives I depending on their composition, absorb in a solid state adsorbed to titanium dioxide in a range from about 400 to 800 nm.
- the rylene derivatives I can be easily and permanently fixed on the metal oxide film.
- the binding takes place via the anhydride function (x1) or the formed in situ
- the dyes have an anchor group at one end of the molecule, which ensures their fixation on the n-type semiconductor film.
- the dyes preferably contain electron donors Y, which facilitate regeneration of the dye after electron donation to the n-type semiconductor and also prevent recombination with electrons already released to the semiconductor.
- the fixation of the dyes on the metal oxide films can be done in a simple manner.
- the n-type semiconductive metal oxide films in freshly sintered (still warm) state may be contacted with a solution or suspension of the dye in a suitable organic solvent for a sufficient period of time (e.g., about 0.5 to 24 hours). This can be done, for example, by immersing the substrate coated with the metal oxide in the solution of the dye.
- combinations of different dyes are to be used, they can be applied, for example, one after the other from one or more solutions or suspensions containing one or more of the dyes. Also possible is the use of two dyes separated by a layer of e.g. CuSCN are (see, for example, Tennakone, K.J., Phys. Chem B. 2003, 107, 13758). The most appropriate method can be determined comparatively easily in individual cases.
- the solar cell When selecting the dye and the size of the oxide particles, the solar cell should be designed so that as much light as possible is absorbed by both sub-cells. Therefore, as already described above, the dyes should be chosen as complementary as possible.
- the oxide layers should be structured so that the solid p-type semiconductor can fill the pores well.
- the dye can be present as a separate element or applied in a separate step and applied separately to the remaining layers.
- the dye can also be combined with one or more of the other elements or applied together, for example with the solid p-type semiconductor. So, for example a dye-p-semiconductor combination comprising an absorbent dye having p-type semiconductive properties or, for example, a pigment having absorbing and p-type semiconductive properties.
- the proposed tandem cell concept involves the use of one or more solid p-type semiconductors.
- solid p-type semiconductor or semiconductors it is of course also possible to provide further materials having similar properties, for example solid electrolytes, although preference is given to exclusive use of the at least one solid p-type semiconductor.
- a type of passivating layer may be used which has a passivation material. This layer should be as thin as possible and, if possible, should only cover the hitherto uncovered areas of the n-semiconducting metal oxide.
- the passivation material may also be applied to the metal oxide in time before the dye.
- passivation materials in particular the following substances are preferred: Al 2 O 3 ; an aluminum salt; Silanes, such as CH 3 SiCIs; an organometallic complex, in particular an Al 3+ complex; Al 3+ , in particular an Al 3+ complex; 4-tert-butylpyridine (TBP); MgO; 4-guanidinobutyric acid (GBA); an alkyl acid; Hexadecylmalonic acid (HDMA).
- Solid p-type semiconductors are used in the context of the tandem concept proposed here.
- Solid p-type semiconductors can also be used in the dye-sensitized subcells according to the invention without a large increase in cell resistance, especially when the dyes absorb strongly and therefore require only thin n-type semiconductor layers.
- the p-type semiconductor should have substantially a closed, dense layer to reduce unwanted recombination reactions that could result from contact between the n-type semiconducting metal oxide (particularly in nanoporous form) with the second electrode or the second half-cell.
- solid p-type semiconductors are inorganic solids such as copper (I) iodide and copper (I) thiocyanate.
- Examples here are p-type semiconductors based on polymers such as polythiophene and polyarylamines, or of amorphous, reversibly oxidizable, nonpolymeric organic compounds, such as the spirobifluorenes mentioned at the beginning (cf., for example, US 2006/0049397 and the spiro compounds disclosed herein as p-type semiconductors, which can also be used in the context of the present invention). These solid p-type semiconductors can be used both in undoped and in doped form.
- the proposed photovoltaic element is an element according to the tandem concept, it should be ensured that electrons from the n-type semiconductor of the organic solar cell recombine with the holes from the p-type semiconductor of the dye solar cell with as little energy loss as possible. Otherwise, the charge carriers either can not recombine with each other, resulting in a highly suppressed photocurrent, or the voltage losses become very large.
- a charge recombination zone between the two sub-cells is used to trap the holes of the dye solar cell and electrons of the organic solar cell.
- the charge recombination zone should be at least partially transparent, at least in the spectral region which is predominantly absorbed by the second partial cell downstream in the irradiation direction, so that the second partial cell (eg the organic solar cell) is sufficiently irradiated.
- this charge recombination zone should be as thin as possible, preferably thinner than 20 ⁇ (2.0 nm), preferably about 5 ⁇ (0.5 nm) thick.
- the charge recombination zone may, for example, also be island growth, for example in the form of isolated metal nanoparticles.
- the use of metal nanoparticles in the charge recombination zone can also have the positive effect of a resonance peak and thus an increased absorption of the adjacent active material (see, for example, Rand, B., J. Appl. Phys. 2004, 96, 7519).
- the materials used for the charge recombination zone can preferably be metals, eg Ag, Au, Li, Al, Ti, Sn or combinations and alloys of these and / or other metals, as well as metal oxides (which may also be doped) and / or metal fluorides, such as LiF, if necessary in combination with a metal, such as AI.
- metal oxides which may also be doped
- metal fluorides such as LiF
- conductive polymers could also be used, such as, for example, PEDOT (poly (3,4-ethylenedioxythiophene) poly (styrenesulfonate)). From the metal oxides in particular WO 3 is preferred.
- PEDOT poly (3,4-ethylenedioxythiophene) poly (styrenesulfonate)
- From the metal oxides in particular WO 3 is preferred.
- the use of silver and / or gold is preferred, with the use of silver being particularly preferred. It is also possible to use combinations of different metals and
- recombination materials such as the materials described above
- other concepts can be used to generate a charge recombination zone.
- electronically active impurities can be used which lead to an electron-hole recombination in the charge recombination zone.
- limited defects can be introduced into the layer structure or the interface between the dye solar cell and the organic solar cell. These defects, which act as electronically active impurities, can take place, for example, by heating, by controlled introduction of impurities, by irradiation with high-energy particle radiation during the deposition of the respective organic layers or else by other techniques.
- the charge recombination zone may also comprise a highly doped p / n junction, that is to say comprise a zone in which the materials used are doped more highly than in the remaining layers.
- the organic solar cell preferably adjoins the dye solar cell directly or via the charge recombination zone.
- the dye solar cell is deposited on the support and then applied the organic solar cell.
- the organic solar cell is deposited in this case (directly or after application / introduction of the charge recombination zone) on the existing dye-sensitized solar cell.
- the tandem cell structure according to the invention makes itself particularly advantageous, since the organic solar cells are usually made very thin due to the requirements of charge and / or exciton transport within the layers. As the thickness decreases, however, so does the Efficiency of light absorption. This disadvantageous effect can in turn be reduced by the tandem cell concept.
- the organic solar cell has at least one acceptor material (n-type semiconductor) and at least one donor material (p-type semiconductor) which are in direct or indirect contact with each other at a pn junction, but also intermediate layers (analogous to a pin junction) exist can.
- acceptor material n-type semiconductor
- donor material p-type semiconductor
- intermediate layers analogous to a pin junction
- mixed or partially mixed layers of said materials may be used, that is, instead of, for example, a two-layer structure having two separate materials (e.g., acceptor material layer and donor material layer) a single mixed material layer.
- Transition layers between two separate layers are also possible, for example with an acceptor material layer, an intermediate layer with a mixture of an acceptor material and a donor material (this too is theoretically a Buik heterojunction, see below) and then a donor material layer.
- a Buik heterojunction ie structures known from the field of solar cell technology, in which a boundary layer with a greatly enlarged surface is provided between two layers, for example an acceptor material layer and a donor material layer strongly uneven interface with a plurality of "mountains" and valleys.
- This BuIk heterojunction is particularly advantageous in the acceptor-donor material structure of the organic solar cell.
- the organic solar cell may preferably have a transition between a layer of the acceptor material and a layer of the donor material, wherein preferably the layer of the acceptor material is disposed on a side facing the dye solar cell and the layer of the donor material is disposed on a side of the transition facing away from the dye solar cell (n / p junction).
- This transition can be configured as a direct transition between an n-layer and a p-layer, but can also additionally comprise a mixed layer of at least one acceptor material and at least one donor material (that is, a capacitor) between the layer of the acceptor material and the layer of the donor material Heterojunction).
- the transition and the layers of this transition can, for example, be wholly or partly in the form of polymer layers (for example produced from a solution or dispersion) and / or in the form of (preferably vapor-deposited and / or prepared from a dispersion) pigments or (preferably from a Solution or a dispersion produced) dyes, ie low molecular weight organic materials produced.
- At least one of the two materials (acceptor material and / or donor material) should at least partially absorb electromagnetic radiation, ie in particular light.
- This absorption should in particular be selected to be “complementary" to the absorption of the dye solar cell, ie at least not congruent.
- the dye solar cell has its predominant absorption (for example an absorption maximum) in a shorter (ie more energy-rich) wavelength range than the organic solar cell.
- the organic solar cell absorbs in a range between 600 nm and 1000 nm (of course, this wavelength range does not have to be fully covered and, of course, absorptions in other regions may be present as well ), whereas the dye-sensitized solar cell preferably absorbs in a range which lies between 400 nm and 700 nm (here again, of course, there may be an incomplete coverage of this area and / or additionally an absorption in another area)
- embodiment is possible in principle, ie an embodiment in which the dye-sensitized solar cell has its predominant absorption in a longer wavelength range than the organic solar cell.
- the acceptor material n-material
- the acceptor material n-material
- the acceptor material is applied first, i. for example, in the structure described above as the closest to the dye solar cell material.
- at least one electron transport layer ETL can be introduced between it and the acceptor material of the organic solar cell.
- ETL electron transport layer
- Under an electron transport layer is generally a layer of one or more materials to understand, which have electron-conducting or electron-transporting properties. Depending on the requirements, this ETL can also be n-doped.
- the donor material (p-type material) of the organic solar cell is then applied to the acceptor material, whereby a mixed layer of n- and p-type materials is often formed at the transition or is deliberately brought about.
- the electron transport layer may in particular comprise one or more of the following materials: a Triphenylenderivat; 1, 3-bis (4-tert-butylphenyl-1, 3,4-oxadiazoyl) phenylene (OXD7); 1, 3-bis (4- (N, N-dimethylamino) phenyl-1, 3,4-oxadiazoyl) phenylene (OXD8); 2- (1-naphthyl) -5- (p-tert-butylphenyl) -1, 3,4-oxadiazole (t-Bu-PNF); a titanium oxide (TiOx); bathophenanthroline (BPhen); 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP); 3- (biphenyl-4-yl) -4-phenyl-5- (4-tert-butylphenyl) -1
- acceptor and donor materials it is also possible, in particular when using soluble materials, to deposit these materials completely or partially at the same time and then to heat them, for example.
- pigments can be vapor-deposited and / or applied from a dispersion, and dyes or polymers can be applied from a solution.
- two vapor deposited materials or two soluble materials may be used, but it is also conceivable to use combinations of soluble and vapor deposited materials.
- Acceptance materials are materials in which the main charge carriers are electrons. These preferably have high LUMO (lowest unoccupied molecular orbital electron LUMO, lowest occupied molecular orbital) electrons, high stability against negative excess charge (reduction), LUMO levels or electron affinities in the appropriate energy range, and good injection properties of electrons into a suitable cathodic electrode .
- LUMO lowest unoccupied molecular orbital electron
- LUMO lowest occupied molecular orbital
- fullerenes can also be used. These may be selected from a variety of sizes (number of carbon atoms per molecule).
- the term "fullerenes” as used herein includes various cage-like molecules of pure carbon, including Buckminsterfullerene (C 6 O) and the related "spherical” fullerenes, as well as carbon nanotubes, in principle fullerenes in the range of C 20 to C 2 000 can be used, the range C 6 oC 9 6 being preferred; especially C 6 o and C 7 o- It is also possible to use fullerenes which are chemically modified, such as, for example, PCBM ([6,6] -phenyl-C 6 r butyric acid methyl ester), bis-morpholine-C 60 (BM-C 60 ), C71-PCBM, C 60 -P N- Methylfullerenpyrrolidin or mixtures of these fullerenes.
- PCBM [6,6] -phenyl-C 6 r but
- fullerenes for example, C 60 are distinguished in particular by high exciton diffusion length of (z. B. about 80 ⁇ for C60, see FIG. Petterson et al., J. Appl. Phys., 1999, 86, 487.)
- inorganic nanorods and / or quantum dot materials such as, for example, cadmium selenide (CdSe), cadmium telluride (CdTe), CdS, HgTe, PbS, CuInS 2 or similar materials or material combinations.
- inorganic semiconductor materials preferably in combination with an organic material.
- zinc oxide, tin oxide and TiO 2 can be used, which are preferably used as a partner materials for organic materials.
- These may be nanoparticulate and / or nanorods (nanorods).
- carbon nanotubes can also be used as or in the acceptor materials.
- SWNTs Single-walled carbon nanotubes
- MWNTs multi-walled nanotubes
- n-semiconducting polymers and (alternatively or additionally) LBG polymers, i. "Low bandgap polymers”, ie polymers with a small band gap, such as CN-PPV.
- rylene and rylenetetracarboxylic dyestuffs or rylenemonoimides such as, for example, naphthalene, perylene, terrylene, quaterrylene, pentarylene, hexarylene, heptarylene and the like is particularly preferred.
- Octarylene or pigments such as naphthalene, perylene, terrylene, quaterrylene, pentarylene, hexarylene, heptarylene, octarylene or mixtures, compounds or derivatives of these materials.
- perylenetetracarboxylic bisimidazole (PTCBI) and also the pyrimidines can be used.
- liquid-crystal derivatives for example corresponding derivatives of perylene, terrylene or quaterrylene, such as, for example, those described in Müllen et al. Chem. Mater. 2006, 18, 3715-3725. described compounds.
- the following pigments can be used: 3,4,9,10-perylenetetracarboxylic bisimidobenzimidazole (PTCBI), perylenetetracarboxylic bisimide bisanhydride (PTCBA), Me-PTCDI, ethylphenyl-PTCBI, or combinations of these and / or other materials.
- PTCBI 3,4,9,10-perylenetetracarboxylic bisimidobenzimidazole
- PTCBA perylenetetracarboxylic bisimide bisanhydride
- Me-PTCDI ethylphenyl-PTCBI
- Tetrabromo- and tetrachloro-substituted perylenetetracarboxylic acid diimides are also suitable acceptor materials or n-type semiconductors.
- Donor materials are materials in which the main charge carriers are holes or holes (or their organic conductor counterparts). These materials preferably have a high conductivity of holes (defect electrons) in the HOMO (HOMO: highest occupied molecular orbital, highest occupied molecular orbital), high stability to positive excess charge (oxidation), HOMO levels or ionization potentials in the appropriate energy range, and good injection properties of holes in a suitable anodic electrode.
- HOMO highest occupied molecular orbital, highest occupied molecular orbital
- oxidation HOMO levels or ionization potentials in the appropriate energy range
- suitable anodic electrode for further properties of suitable p-materials or donor materials, reference may be made, for example, to WO 02/101838 A1.
- pentacenes can be used as donor materials, as well as phthalocyanine (Pc) pigments.
- the phthalocyanines may be substituted or unsubstituted. Preference is given to symmetrically substituted, that is unsubstituted, 8-fold or 16-fold substituted phthalocyanines, but also 4-fold substituted Pcs could be suitable under certain circumstances.
- the phthalocyanines may be metal-containing or metal-free. Particularly preferred are CuPc, ZnPc, 4F-ZnPc, SnPc, vanadyl phthalocyanine (VOPc), H 2 Pc, TiOPc or mixtures or derivatives of these Pcs. Under certain circumstances, it is also possible to use subphthalocyanines, as described, for example, in Forrest, Thompson, JACS 2006, 128, 8108-8109.
- phthalocyanine pigments can be used, alternatively or additionally, and phthalocyanine dyes that can be processed from the solution.
- phthalocyanine dyes that can be processed from the solution.
- liquid-crystal-ethynyl-substituted Ni (II) Pc can be mentioned here, as described, for example, in Chem. Commun., 2006, 3107 or in WO 2005/076383.
- Other LC-Pc dyes can be used.
- porphyrins such as, for example, 5,10,15,20-tetra (3-pyridyl) porphyrin (TpyP), as well as merocyanines.
- liquid-crystal materials for example hexabenzocoronene (HBC-PhCl 2) or other coronene, coronodimiimides, or triphenylenes, such as 2,3,6,7,10,1-hexahexylthiotriphenylene (HTT 6) or 2,3,6,7 , 10,11-hexa- (4-n-nonylphenyl) -triphenylene (PTP9), 2,3,6,7,10,1-hexa- (undecyloxy) -triphenylene (HAT1 1).
- liquid crystal materials can be used which are discotic. It is also possible to use 2,3,9,10,16,17,23,24-octa (2-benzyloxyethylsulfanyl) phthalocyanato copper (II) (DL-CuPc) or other alkyl, alkoxy or thioalkoxy chain PCs which are discotic liquid crystal materials are.
- thiophenes as well as thiophene-containing compounds and thiophene derivatives.
- thiophene-containing low molecular weight defined compounds, thiophene-containing oligomers (with or without side chains, which influence the solubility) or thiophene-containing polymers can be used, such as.
- poly-3-hexylthiophene or compounds of the type ⁇ , ⁇ '-bis (2,2-dicyanovinyl) quinquethiophene DCV5T
- P3HT (3- (4-octylphenyl) -2,2'-bithiophene)
- POMeOPT poly (3- (2'methoxy-5'-octylphenyl) thiophene)
- P3OT poly (3-octylthiophene)
- EHH-PpyPz copolymers such as PTPTB or PCPDTBT (see, for example, Brabec C, Adv.
- para-phenylenevinylene-containing oligomers or polymers are contemplated, e.g. Poly (phenoxy) vinylene (PPV), poly (2-methoxy-5- (2'-ethylhexyloxy) -1, 4-phenylene-vinylene (MEH-PPV), poly (2-methoxy-5- (3 ', 7'-dimethyloctyloxy ) -1, 4-phenylene-vinylene) (MDMO-PPV), as well as CN-PPV, possibly with various alkoxy derivatives, PPE-PPV or hybrid polymers.
- polyfluorenes and alternating polyfluorene copolymers such as e.g. Copolymers with 4,7-dithien-2'-yl-2,1,3-benzothiadiazole, and F8BT (a polyfluorene copolymer) and / or PFB.
- TPD triphenyldiamin
- spiro-MeOTAD spiro-MeOTAD
- benzidine derivatives CBP, Polytriary- Lamins, polycyclopentadienes, polypyrroles, polyfurans, polysilanes, polyphospholes
- rylene derivatives can be used, provided that they carry donor properties by means of appropriate substituents.
- fullerenes can be used, such as C 6 o and its derivatives, such as [6,6] -phenyl C6i butyric acid methyl ester (PCBM).
- PCBM phenyl C6i butyric acid methyl ester
- the fullerene derivative would be used as a hole conductor.
- copper (I) iodide and copper (I) thiocyanate can be used.
- the donor materials and / or the acceptor materials can also be present or used in doped form.
- Examples of p-type dopants are, in particular, Br 2, WO 3 , MoO 3 , F4-TCNQ (tetrafluoro-7,7,8,8-tetracyanoquinodimethane).
- Examples of n-type dopants are in particular Cs, Cs 2 CO 3 , pyronin B.
- p-n mixed materials can also be used, in particular as an intermediate layer.
- donor material and acceptor material can be present in a single material, for example in a monomer, onomer, polymer, block polymer, a polymer with C ⁇ oS, C ⁇ o-azo dye, triads carotenoid porphyrin quinones.
- liquid-crystal donor-acceptor systems as described, for example, in Kelly, S., Adv. Mater. 2006, 18, 1754 are described.
- the organic solar cell has at least one blocking layer.
- a blocking layer can, for example, prevent (during the application of the layers or even later in the operation of the element) the materials mix and thus deteriorate the device properties.
- the blocking layer may be interposed between the second electrode and a donor material (p-type absorber, p-type semiconductor) of the organic solar cell, particularly to prevent penetration of electrode materials into the donor material.
- a donor material p-type absorber, p-type semiconductor
- an exciton blocking layer or hole transport layer for example, one or more of the following materials are available: include: N, N'-di-1-naphthyl-N, N'-diphenyl-1, 1'-biphenyl-4,4'-diamine (NPD), N 1 N'-diphenyl-N, N'-bis (m-tolyl) -benzidine (TPD), N, N'-bis (1-naphthyl) -N, N'-diphenyl-1, 1'-biphenyl-4-4'-diamine (NPB), 4,4 ', 4 "tris (N-3-methylphenyl-N-phenyl-amino) -triphenylamine (MTDATA), a diphenylbenzimidazole carbene-iridium complex (Ir (DPBIC) 3 ), spiro-MeOTAD, a benzidine derivative, especially ⁇ -NPD
- a second electrode which can be configured in particular as a top electrode (see the example of a preferred structure described above), several concepts known from the prior art can also be used. Examples of such top electrodes are listed in WO 02/101838 (in particular pages 18-20).
- metal electrodes which may comprise one or more metals in pure form or as a mixture / alloy, in particular aluminum or silver.
- inorganic / organic mixing electrodes or multi-layer electrodes is possible, such as the use of LiF / Al electrodes.
- Electrodes in which the quantum efficiency of the components is increased by forcing the photons through corresponding reflections to pass through the absorbing layers at least twice.
- Such layer structures are also referred to as "concentrators” and are likewise described, for example, in WO 02/101838 (in particular pages 23-24).
- a method for producing a photovoltaic element is also proposed.
- This method can be used in particular for producing a photovoltaic element in one of the embodiments described above.
- the above-proposed materials and layers and particular embodiments of the photovoltaic element according to the subclaims of the invention can be converted into corresponding optional and preferred process steps which can be used according to the invention as particular embodiments of the proposed method.
- photovoltaic elements according to the invention can also be produced by other methods than the proposed production method, so that As a rule, no restrictions with respect to the design of the proposed photovoltaic element can be derived from the production process.
- the method according to the invention has the following steps, which, however, do not necessarily have to be carried out in the order shown. Furthermore, additional process steps may be performed, for example, process steps for generating the above-described preferred specific embodiments of the photovoltaic element. Also, single or multiple process steps may be performed in parallel or temporally overlapping in time and / or may be performed repeatedly.
- a dye-sensitized solar cell is prepared, wherein the following steps are carried out: o at least one n-type semiconducting metal oxide is applied to a first electrode
- an organic solar cell is fabricated, wherein the organic solar cell is configured to absorb electromagnetic radiation in a second spectral range which is at least partially different from the first spectral range, wherein the following steps are performed: o at least one acceptor material is applied to the dye solar cell; o at least one donor material is applied to the dye solar cell, o at least one second electrode is applied to an opposite side of the dye solar cell, wherein the first electrode and / or the second electrode for the electromagnetic radiation is at least partially transparent.
- the steps of applying the dye and applying the p-type semiconductor may also be summarized, such as for example, by using a corresponding absorbing dye or pigment.
- Figure 1 shows a structure of a first embodiment of a tandem solar cell according to the invention
- FIG. 2 is a simplified level diagram of the tandem solar cell shown in Figure 1;
- FIGS. 3A to 3E show various examples of material combinations for the tandem solar cell shown in FIG. 1;
- FIG. 4 shows a current-voltage characteristic of an exemplary embodiment of a tandem solar cell according to the invention with a structure according to FIG. 3A;
- FIG. 5 shows a construction of a second exemplary embodiment of a tandem solar cell according to the invention.
- FIG. 6 shows a current-voltage characteristic of the exemplary embodiment according to FIG. 5.
- FIG. 1 shows a first exemplary embodiment of a tandem solar cell 110.
- the tandem solar cell 110 has a carrier 11 which is substantially transparent to light 12 (preferably solar radiation).
- this carrier 114 can be, for example, a glass substrate, a transparent plastic substrate (for example a polyethylene film, a PET film, a PTFE film or other types of plastics) or laminates of such or other materials include.
- a transparent plastic substrate for example a polyethylene film, a PET film, a PTFE film or other types of plastics
- laminates of such or other materials include.
- this TCO 116 is FTO (fluorine-doped tin oxide).
- this TCO 16 thus forms the first electrode 118 of the tandem solar cell 1 10.
- this first electrode 1 18 can be connected via corresponding electrode contacts (not shown in FIG. 1). be contacted.
- a buffer layer 119 is optionally applied to the first electrode 1 18, which at least largely prevents holes from reaching the first electrode 1 18.
- a single layer of (preferably non-nanoporous) titanium dioxide is used here as the buffer layer 119.
- This buffer layer preferably has a thickness which (in this or other embodiments of the present invention) may be between 10 nm and 500 nm.
- Such layers can be produced, for example, by sputtering and / or spray pyrolysis.
- n-type semiconducting metal oxide 120 Applied to the buffer layer 1 19 is an n-type semiconducting metal oxide 120, which is sensitized with a dye 122 as described above. In the following it is assumed that this n-type semiconducting metal oxide 120 is titanium dioxide, without thereby limiting the scope of the invention.
- n-type semiconductive metal oxide 120 sensitized with the dye 122 Onto the n-type semiconductive metal oxide 120 sensitized with the dye 122, a solid p-type semiconductor 124 is deposited.
- this p-type semiconductor 124 For possibilities of embodiment and the choice of material for this p-type semiconductor 124, reference is made to the following examples.
- a dye recombination zone 128 adjoins this dye solar cell 126 in the preferred embodiment shown in FIG.
- This charge recombination zone 128 may, for example, be designed as a floating electrode (ie, an electrode not electrically contacted) and in this regard represents the top Electrode for the dye solar cell 126 and at the same time the bottom electrode for a subsequent organic solar cell 130 (see description below).
- This approach makes it particularly clear that the preferred embodiment shown in Figure 1 is a two-contact tandem solar cell.
- this charge recombination zone 128, which, as described above, can also be realized in the form of a defect zone in one of the adjoining layers, for example in the form of a defect zone within the uppermost layer of the p-type semiconductor 124, the exemplary embodiment illustrated in FIG an organic solar cell 130.
- This organic solar cell 130 forms the second subcell of the tandem solar cell 110 and preferably absorbs the light 112 in a longer wavelength range.
- the absorption area is selected to be complementary to the absorption area of the dye solar cell 126.
- the organic solar cell 130 first comprises an acceptor material 132 as an n-semiconducting layer. Adjoining this acceptor material 132 is a donor material 134, as a p-type semiconductive layer. At least one of the layers 132 or 134 must have absorbing properties for the light 112 in the embodiment illustrated in FIG. Accordingly, it is possible to speak of an "n-absorber" 132 or a "p-absorber” 134. In the construction shown in Figure 1, the acceptor material 132 and the donor material 134 are shown as separate layers. However, as mentioned above, this is merely one way to realize the organic solar cell 130.
- mixed layers with acceptor and donor materials are also possible, for example in the context of a monolayer and / or in the context of an acceptor material layer, a donor material layer and an intervening mixed layer (ie an n-bulk heterojunction-p layer structure), or complete ones can also be used
- BuIk realize heterojunctions that is, constructions in which acceptor material 132 and donor material 134 intermesh along a highly uneven interface within a broad limit (which may be up to a few microns).
- acceptor materials 132 and / or a plurality of donor materials 134 which in turn can be used, for example, as separate layers and / or as mixed layers.
- all layers and materials can be used in pure, undoped or doped form.
- the donor material 134 is followed by an (optional) blocking layer 136 in the embodiment shown in FIG.
- a second electrode 138 is applied as a top contact, which can act as the second electrode of the two-contact tandem solar cell 110 realized here. Accordingly, this second electrode 138 can be contacted by corresponding electrode contacts. so that between the first electrode 118 and the second electrode 138, the photo voltage can be tapped.
- the blocking layer 136 serves, in particular, to prevent material of the second electrode 138 from penetrating into the layer of the donor material 134.
- FIG. 2 shows a level diagram of the layer structure of the tandem solar cell 110 shown in FIG.
- the blocking layer 136 which in the ideal case assumes no significant electrical function, was omitted.
- the first electrode 1 18 and the second electrode 138 are characterized in the construction shown in Figure 2 each by their Fermi level 210 and 212 respectively.
- the level of the non-contacted charge recombination zone which may comprise, for example, a floating metal electrode and which, accordingly, approximately corresponds to the vacuum level, is indicated at 214 in FIG.
- the individual levels of the layers of the dye solar cell 126 and of the organic solar cell 130 are shown symbolically in FIG.
- the lower horizontal edge of a rectangle denotes the level of the valence band of the corresponding layer (if it is an inorganic semiconductor), or in the molecular orbital model the level of the highest occupied molecular orbital (HOMO).
- the upper horizontal edges of each rectangle indicate the energetic position of the conduction band or (in the molecular orbital model) the level of the lowest unoccupied molecular orbital (LUMO).
- the p-type semiconductor material 124 transmits electrons to the dye 122, thereby forming 124 holes in the p-type semiconductor. These in turn are balanced at the charge recombination zone 128.
- the transport of holes (h + ) and electrons (e " ) results in a potential difference ⁇ Ui between the charge recombination zone 128 and the first electrode 118, which corresponds to a photovoltage V O c1 of the dye solar cell 126. If the solar cell were lenied only comprise the dye solar cell 126, so this would be tapped off the E lektrodenAuthen voltage.
- the tandem solar cell 110 also comprises the organic solar cell 130. Photons of a second, longer wavelength of the light 112 are absorbed in this organic solar cell 130.
- the wavelength of the absorbed light depends on the properties of the acceptor material 132 and / or the donor material 134, in particular its bandgap. In this way, excitons are formed in the acceptor material 132 and / or in the donor material 134, which excite electrons and holes at the transition between the materials 132, 134.
- the electrons travel to the charge recombination zone 128, the holes to the second electrode 138.
- a potential difference AU 2 which corresponds to a photovoltage V O c2.
- This photovoltage V O c2 would be that photovoltage that would be picked up at the open electrode contacts of the solar cell, if it only included the organic solar cell 130.
- the total photovoltage of the tandem solar cell 110 results as long as the electrodes 118 and 138 are separated and no current flows through the tandem solar cell 110, thus as the sum of the two photovoltages V O c1 and V O c2.
- tandem solar cells 110 were produced as follows with a layer structure designed analogously to FIGS. 1 and 2.
- the layer structure is shown in FIG. 3A.
- the base material used was glass-coated tin oxide (FTO) coated 25 mm x 15 mm x 3 mm (Nippon Sheet Glass) glass plates, which were treated successively with glass cleaner (RBS 35), demineralized water and acetone for 5 min each in the ultrasonic bath, then Boiled for 10 minutes in iso-propanol and dried in a nitrogen stream.
- FTO glass-coated tin oxide
- RBS 35 glass cleaner
- a sputtering method was used. Alternatively or additionally, however, it is also possible to use other processes, for example spray pyrolysis processes. Thereupon, a TiO 2 paste (Catalysts & Chemicals IND INDUS. CO., LTD (CCI)) containing 25 nm diameter TiO 2 particles in a terpineol / ethyl cellulose dispersion was coated with a spincoater at 4500 Spun spin-on and dried at 90 ° C. for 30 minutes. After heating at 450 ° C. for 45 minutes and a sintering step at 450 ° C.
- a TiO 2 paste Catalysts & Chemicals IND INDUS. CO., LTD (CCI)
- the TiO 2 layer thickness was approximately 0.5 ⁇ m, but this was not confirmed by a measurement.
- the electrical length of insulation of the metal rear electrode of the working electrode 2 layer were at the edges of a strip along each side of the polyimide TiO (Pyrolin polyimides coating, manufacturer Supelco) was applied and cured for 15 minutes at 200 0 C in a drying cabinet.
- the sample was cooled to 80 0 C and 12 h in a 5 x 10 "4 mM solution of a dye in MeCN / t-BuOH. 1: 1 dipped while the dye D102 was used as a dye is used as in Schmidt-Mende et al., Adv., Mater., 2005, 17, 813.
- the sample was subsequently rinsed with the same solvent and dried in a stream of nitrogen, and the samples thus produced were then concentrated at 40 ° C. in vacuo dried.
- a p-type semiconductor solution was spin-coated. To this was added 0.16M Spiro-MeOTAD (Merck, SHT-263), 15mM LiN (SO 2 CF 3 ) 2 (Aldrich), 0.12M 4-t-butylpyridine (Aldrich) solution in chlorobenzene. 150 ⁇ l of this solution was applied to the sample and allowed to act for 60 s. Thereafter, the supernatant solution was spun for 30 s at 2000 revolutions per minute and dried for 4 h at 40 0 C in a vacuum oven.
- Evaporation of PTCBI took place at a temperature of 440 ° C and a deposition rate of 0.2-1.0 nm / s, CuPc was at 380 ° C at a rate of 0.2- The resulting layer thicknesses were 50 nm for the PTCBI layer and also 50 nm for the CuPc layer.
- the metal back electrode (second electrode) was vacuum deposited by thermal metal evaporation.
- the sample was provided with a mask in order to evaporate 4 separate rectangular back electrodes with dimensions of approximately 4 mm ⁇ 3 mm onto the active region, each of which was approximately 3 mm ⁇ 2 mm in size.
- HY contact surface are connected over the above-described polyimide layer.
- Au was used as the metal that 5 mbar was evaporated at a rate of 0.2-1.0 nm / s at a pressure of about 5 * 10 ", so that a layer thickness of about 50 nm was formed.
- the respective current / voltage characteristic was measured with a Source Meter Model 2400 (Keithley Instruments Inc.) under irradiation with a halogen lamp field (Xenophot® 64629, Osram) as a solar simulator.
- the short-circuit current (ie the current density at zero load resistance) was 1.93 mA / cm 2 , the open terminal voltage V O c (ie the load at which the current density has dropped to zero) was 1 103 mV, the Fill factor was 57%, and the efficiency was 1.2%.
- FIGS. 3B to 3E schematically show alternative embodiments to FIG. 3A.
- the PTCBI of the acceptor material 132 is replaced by the material QDI.
- the acceptor material QDI (quaterrylene diimide) is described, for example, in K. Müllen et al., Chem. Mater. 18, 3715-3725 (2006) (referred to therein as "compound 3").
- dye D102 is replaced by dye Z907 as dye 122 in comparison to the structure in FIG. 3B (see M. Grätzel et al., Appl. Phys. Lett. 86, 013504 (2005)). Furthermore, the QTCBI or QDI as acceptor material 132 is replaced by the fullerene C60.
- FIG. 3D again represents a modification of the layer structure in FIG. 3B.
- CuPc as the donor material 134 is replaced by P3HT in comparison with the structure in FIG. 3B.
- FIG. 3E corresponds to the structure in FIG. 3D, but with QDI replaced as acceptor material 132 by C71-PCBM and P3HT as donor material 134 replaced by PCPDTBT.
- the HOMO and LUMO levels are plotted in electron volts (eV), as far as these are known.
- the charge recombination zone 128 is designated LRZ in FIGS. 3A to 3E.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- FIGS. 5 and 6 show a further exemplary embodiment of a tandem solar cell 110 according to the invention.
- FIG. 5 shows a schematic representation of the layer structure analogous to FIG.
- FIG. 6 shows measurement data of this structure, similar to the representation in FIG. 4.
- the layer structure shown in FIG. 5 initially largely corresponds to the layer structure according to FIG. 1, so that reference can largely be made to the description of FIG. 1 for the function of the illustrated layers.
- the material selection and the production of the layer sequence is shown below.
- An essential difference of the layer structure in the exemplary embodiment according to FIG. 5 to FIG. 1 is that between the charge recombination zone 128 and the organic solar cell 130, in this case the acceptor material 132 of the organic solar cell 130, an electron transport layer 129 is inserted, in order to electrically couple the charge recombination zone 128 to the organic solar cell 130 to improve.
- the layer structure shown in Figure 5 was generated as follows.
- glass plates of 25 mm ⁇ 15 mm ⁇ 3 mm (Nippon Sheet Glass) coated with fluorine-doped tin oxide (FTO) were used as the base material.
- RBS 35 treated with deionized water and acetone for 5 min each in an ultrasonic bath, then boiled for 10 minutes in iso-propanol and dried in a stream of nitrogen.
- an optional buffer layer 1 19 in the form of a solid TiO 2 buffer layer was again used.
- a spray pyrolysis process was used.
- a layer of n-type semiconducting metal oxide 120 was deposited on the buffer layer 119.
- a Ti ⁇ 2 paste (Dyesol, DSL 18NR-T), spin coated with a spin coater at 4500 revolutions per minute and dried at 90 0 C for 30 min. After a 45 minutes heating to 450 0 C and a sintering step for 30 minutes at 450 0 C., a TiO 2 layer thickness of proximity gave, 1, 8 microns.
- the intermediates thus prepared were then optionally treated with TiCl 4 as described by Grätzel in, for example, Grätzel M. et al., Adv. Mater. 2006, 18, 1202.
- second electrodes 138 metal back electrodes
- first electrode 118 working electrode
- the sample was cooled to 80 0 C after removal from the oven and 2 hours in a 5 x 10 "4 mM solution of the dye in MeCN / t-BuOH. 1: 1 immersed As the dye 122 was thereby the dye D102, as described in Schmidt-Mende et al., Adv., Mater., 2005, 17, 813. After removal from the solution, the sample was then rinsed with the same solvent and dried in a stream of nitrogen dried at 40 0 C in a vacuum.
- a p-type semiconductor solution was next spin-coated. To this was added 0.12M Spiro-MeOTAD (Merck, SHT-263), 15mM LiN (SO 2 CFs) 2 (Aldrich), 0.06M 4-t-butylpyridine (Aldrich) solution in chlorobenzene. 75 ⁇ l of this solution was applied to the sample and allowed to act for 60 s. Thereafter, the supernatant solution was spun at 2000 revolutions per minute for 30 seconds and stored overnight in the dark.
- Spiro-MeOTAD Merck, SHT-263
- 15mM LiN (SO 2 CFs) 2 Aldrich
- 0.06M 4-t-butylpyridine Aldrich
- a thin charge recombination zone 128 was applied.
- Ag was evaporated by thermal metal evaporation in vacuo at a rate of 0.1 A / s at a pressure of 3 * 10 "6 mbar, so that resulted in a about 2 nm thick Ag layer.
- a derar- term layer still had good transparency properties in visible spectral range.
- an electron transport layer 129 is interposed between the charge recombination zone 128 and the organic solar cell 130.
- a Bphen layer as the electron transport layer 129 with a layer thickness of 5 nm at a rate of 0.7A / sec and a temperature of 140 0 C was first deposited on the charge recombination zone 128 serving as a silver layer.
- This layer acts as an exciton blocker for the subsequent C ⁇ o layer of the acceptor material 132 and provides a good electrical ronic contact between the fullerenes and the charge recombination zone 128.
- the Bphen layer of the electron transport layer 129 was followed by an acceptor material 132 and an electron conductor serving C ⁇ o layer with a layer thickness of 20 nm. This was vapor-deposited at a rate of 2 A / s and a temperature of 400 0 C.
- a metal back electrode was vacuum-deposited by thermal metal evaporation. Ag was used as metal which has been evaporated at a rate of 3 A / s at a pressure of about 2 * 10 "6 mbar, so that a layer thickness of about 100 nm was formed.
- the tandem solar cell 110 thus produced was subsequently measured for its electrical-optical properties. This is illustrated by the characteristic curve in FIG. 6, in which, analogously to FIG. 4, the current density j is again plotted against the photovoltage U ph .
- the plot was made here with a different sign than in FIG. 4, which is, however, due to measurement technology and not due to fundamental physical differences.
- the respective current / voltage characteristic was measured with a Source Meter Model 2400 (Keithley Instruments Inc.) under irradiation with a halogen lamp field (Xenophot® 64629, Osram) as a solar simulator.
- the short-circuit current (ie the current density at La stwid was zero) was 8.25 mA / cm 2
- the open-terminal voltage V O c (ie the load at which the current density had fallen to zero) was 1370 mV
- the fill factor was 54%
- the efficiency was 6.14%.
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Abstract
Description
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Priority Applications (8)
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KR1020147018313A KR20140091077A (ko) | 2007-07-23 | 2008-07-22 | 광전 탠덤 전지 |
US12/670,036 US8563855B2 (en) | 2007-07-23 | 2008-07-22 | Tandem photovoltaic cell |
JP2010517385A JP5615174B2 (ja) | 2007-07-23 | 2008-07-22 | 光起電力タンデム電池 |
KR1020107003968A KR101479803B1 (ko) | 2007-07-23 | 2008-07-22 | 광전 탠덤 전지 |
EP08786301A EP2174329B1 (de) | 2007-07-23 | 2008-07-22 | Photovoltaische tandem-zelle |
DE502008002569T DE502008002569D1 (de) | 2007-07-23 | 2008-07-22 | Photovoltaische tandem-zelle |
AT08786301T ATE498203T1 (de) | 2007-07-23 | 2008-07-22 | Photovoltaische tandem-zelle |
CN200880108241.0A CN101802948B (zh) | 2007-07-23 | 2008-07-22 | 串列光伏电池 |
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Also Published As
Publication number | Publication date |
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CN101802948A (zh) | 2010-08-11 |
CN101802948B (zh) | 2014-01-15 |
KR101479803B1 (ko) | 2015-01-06 |
KR20140091077A (ko) | 2014-07-18 |
KR20100044865A (ko) | 2010-04-30 |
EP2174329A1 (de) | 2010-04-14 |
EP2174329B1 (de) | 2011-02-09 |
US8563855B2 (en) | 2013-10-22 |
US20100282309A1 (en) | 2010-11-11 |
JP5615174B2 (ja) | 2014-10-29 |
DE502008002569D1 (de) | 2011-03-24 |
JP2010534409A (ja) | 2010-11-04 |
ATE498203T1 (de) | 2011-02-15 |
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