AU761370B2 - Methods to implement interconnects in multi-cell regenerative photovoltaic photoelectrochemical devices - Google Patents
Methods to implement interconnects in multi-cell regenerative photovoltaic photoelectrochemical devices Download PDFInfo
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- AU761370B2 AU761370B2 AU31354/00A AU3135400A AU761370B2 AU 761370 B2 AU761370 B2 AU 761370B2 AU 31354/00 A AU31354/00 A AU 31354/00A AU 3135400 A AU3135400 A AU 3135400A AU 761370 B2 AU761370 B2 AU 761370B2
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- Australia
- Prior art keywords
- conductive particles
- photoelectrochemical device
- photoelectrochemical
- distance
- electrically
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- 230000001172 regenerating effect Effects 0.000 title claims description 5
- 238000000034 method Methods 0.000 title description 8
- 239000002245 particle Substances 0.000 claims description 43
- 239000004020 conductor Substances 0.000 claims description 24
- 239000000758 substrate Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- 239000003792 electrolyte Substances 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 10
- 229920001940 conductive polymer Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000002322 conducting polymer Substances 0.000 claims description 2
- 239000011149 active material Substances 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 description 18
- 239000011248 coating agent Substances 0.000 description 9
- 230000004888 barrier function Effects 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920000128 polypyrrole Polymers 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000010411 electrocatalyst Substances 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920006397 acrylic thermoplastic Polymers 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011532 electronic conductor Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- -1 ormocers Polymers 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229940071182 stannate Drugs 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- 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
Description
WO 00/57441 PCT/AU00/00190 METHODS TO IMPLEMENT INTERCONNECTS IN MULTI-CELL REGENERATIVE PHOTOVOLTAIC PHOTOELECTROCHEMICAL DEVICES TECHNICAL FIELD This invention relates to multi-cell regenerative photovoltaic photoelectrochemical (RPEC) devices, materials and methods used for internal electrically conductive connections (here called 'interconnects') for such devices, and materials and methods used for dividing electrically conducting layers within such devices.
Examples of the RPEC cells of the type concerned are disclosed in the following US patents: 4927721, Photoelectrochemical cell; Michael Graetzel and Paul Liska, 1990.
5350644, Photovoltaic cells; Michael Graetzel, Mohammad K Nazeeruddin and Brian O'Regan, 1994.
5525440, Method of manufacture of photoelectrochemical cell and a cell made by this method; Andreas Kay, Michael Graetzel and Brian O'Regan, 1996.
5728487, Photoelectrochemical cell and electrolyte for this cell; Michael Graetzel, Yordan Athanassov and Pierre Bonhote, 1998.
BACKGROUND TO THE INVENTION Photoelectrochemical PV cells, as of the type disclosed in the above patents, are capable of being fabricated in a laminate arrangement between two large area substrates without undue expense. A typical arrangement utilises electrically conducting coatings upon the internal surfaces of such substrates, with at least one of such substrates being transparent to visible light (eg. comprised of glass or plastics) and coated with a transparent electron conductor (TEC). However, such TEC WO 00/57441 PCT/AU00/00190 coatings, which usually comprise a metal oxide(s), have high resistivity when compared with normal metal conductors, resulting in high resistive losses for large area RPEC cells. In addition, individual RPEC cells generate a voltage that is inadequate for many applications. A multiple of RPEC cells (here called 'RPEC modules') connected in series would generate higher voltages and minimise total current, thereby minimising power loss due to the resistance of such TEC coating(s).
External series connection of RPEC cells can increase manufacturing costs and introduce additional resistive losses. To enable internal series connection of adjacent RPEC cells, selected areas of such conducting coatings must be electrically isolated, portions of such areas overlapped when laminated, interconnects used to connect such overlapped areas and electrolyte-impermeable barriers used to separate the electrolyte of individual cells.
SUMMARY OF THE INVENTION Preferably, the present invention provides materials and methods for interconnects for use with RPEC modules that will overcome the mentioned disadvantages in the art.
The present invention provides a regenerative photovoltaic photoelectrochemical device comprising two or more photoelectrochemical cells laminated between two substrates with opposing electrical conductors (2,11) supported upon the internal surfaces of said substrates, wherein at least one conductor and it's adjacent substrate is substantially transparent to visible light, and wherein said conductors on each substrate are each divided into electrically isolated regions with each said cell being formed between parts of two regions of WO 00/57441 PCT/AU00/00190 said opposing planar conductors and with each said cell comprising: a photoanode a cathode (11) and an electrolyte medium located between said photoanode and said cathode, where said adjacent photoelectrochemical cells are electrically interconnected in series by an electrically interconnecting material comprising conductive particles Note that interconnects for use with RPEC modules preferably need not have conductivities approaching that of metals, because the interconnection is made along the entire length of each cell and, moreover, the conduction path length is normally only 30pm-50 m, which is the distance between opposing electrically conducting coatings. Thus we have found that efficient and satisfactory RPEC modules can be made with interconnects having bulk resistivity below 20 ohm cm.
In one embodiment, this invention involves the use of an improved composite material as such interconnects which can be deposited as a thin strip of liquid or paste, so that such a strip is adapted to bridge such overlapped areas of conducting coatings and then cured crosslinked), thermoset, dried, sintered or otherwise processed to form an electronic conductor between such conducting coatings after such opposing substrates have been assembled. Whilst said composite material can be deposited by conventional screen or stencil printing, this process may cause damage to electrodes previously deposited. In one preferred embodiment of the invention, the composite material is deposited as a thin strip of liquid or paste from a nozzle, whereby said nozzle or substrate or both are moved to effect such deposition.
The composite material preferably comprises electrically conducting particles embedded in a polymeric matrix. In a WO 00/57441 PCT/AUOO/00190 4 preferred embodiment of the invention, the relative proportion by volume of conductive particles to matrix material in said interconnects is preferably between and 2:1, with the high concentrations of conductive particles being preferred.
In one preferred embodiment of the invention, said interconnect may be substantially impervious to and unreactive towards the electrolyte of the RPEC cells, thereby also performing the function of an electrolyteimpermeable barrier. In another preferred embodiment of the invention, the interconnect may be unreactive towards, but not substantially impervious to, the electrolyte of the RPEC cells. In this preferred embodiment of the invention, an electrolyte-impermeable barrier located beside the interconnect is used to separate the electrolyte of individual cells. In this preferred embodiment of the invention, said conductive particles and said polymer matrix of said interconnect may be selected from a wider range of materials due to less stringent chemical permeability requirements. In another preferred embodiment of the invention, the interconnect is chemically isolated from the electrolyte of the RPEC cells by electrolyte-impermeable barriers on both sides of the interconnect. In this preferred embodiment of the invention, said conductive particles and said polymer matrix of said interconnect may be selected from a wider range of materials due to less stringent chemical reactivity requirements. Said impermeable barriers may be electrically conducting or non-conducting and may be composed of any suitable material, including, but not limited to, silicones, epoxies, polyesters, polyolefins, acrylic, ormocers and thermoplastics. Said impermeable barriers may be deposited as thin strips of liquid or WO 00/57441 PCT/AU00/00190 paste. It is preferable that said impermeable barriers are co-deposited with said interconnect from separate nozzles mounted beside the nozzle from which said interconnect is deposited. In another preferred embodiment of the invention, the interconnect comprises said composite material with a very thin strip of conductive polymer located between said composite material and one or both said conducting coatings. In this preferred embodiment of the invention, said very thin strip(s) of conductive polymer provides improved electrical conductivity between said composite material and said conducting coating(s).
In this preferred embodiment of the invention, said very thin strip(s) of conductive polymer may contain polypyrroles, polyanalines, 3,4-ethylene dioxythiophenes and the like and is preferably deposited from a nozzle as previously described.
The polymeric matrix of the interconnect may be electrically conducting containing polypyrroles, polyanalines, 3,4-ethylene dioxythiophenes and the like) or may be electrically insulating containing silicones, epoxies, polyesters, polyolefins, acrylics, ormocers, thermoplastics). Suitable materials for conducting particles may include but are not limited to metallic conductors such as metallic materials (e.g.
tungsten, titanium and platinum) in the form of particles and/or metallic beads, and non-metallic conductors such as carbon, ceramics indium tin oxide, ruthenium dioxide, cadmium stannate and fluorine-doped stannic oxide), and conducting polymers polypyrroles, polyanalines, 3,4-ethylene dioxythiophenes and the like, which can be formed as particles from solution or formed in bulk and commuted to size).
WO 00/57441 PCT/AUOO/00190 6 In one preferred embodiment of the invention, the conducting particles are of dimensions approximating the distance between the opposing electrically conducting coatings. In another preferred embodiment of the invention, the conducting particles are of dimensions smaller than said distance and are preferably of dimensions less than 5% of said distance. In still another preferred embodiment of the invention, the conducting particles are of a mixture of sizes, whereby some said particles are of dimensions approximating said distance and other said particles are of dimensions smaller than said distance and are preferably of dimensions less than 5% of said distance. In still another preferred embodiment of the invention, the conducting particles are of a mixture of sizes, whereby some said particles, comprising at least 20% of the total weight of such particles, are of dimensions approximating said distance and other said particles are of dimensions smaller than said distance and are preferably of dimensions less than 5% of said distance. In still another preferred embodiment of the invention, the conducting particles are of a mixture of sizes, whereby some said particles are of dimensions approximating said distance and other said particles, comprising at least of the total weight of such particles, are of dimensions smaller than said distance and are preferably of dimensions less than 5% of said distance. In still another preferred embodiment of the invention, the conducting particles are of a mixture of sizes, whereby some said particles are of dimensions approximating said distance, other said particles are of dimensions smaller than said distance and are preferably of dimensions less than 5% of said distance, and still other said particles WO 00/57441 PCT/AU00/00190 are of dimensions less than said distance and greater than of said distance. Certain mechanical forces, such as wind loading, may cause a short circuit to occur between the laminated electrodes in some RPEC module designs. It is a feature of this invention, that interconnects containing conductive particles of dimensions approximating to or near to said distance between said opposing electrically conducting coatings may prevent or minimise the occurrence of such short circuits during such mechanical loading.
BRIEF DESCRIPTION OF DRAWINGS Having broadly portrayed the nature of the present invention, embodiments thereof will now be described by way of example and illustration only. In the following description, reference will be made to the accompanying drawings in which: Figure 1 is an enlarged partial transverse section of the region surrounding an interconnect within a RPEC module formed in accordance one example of the invention.
Figure 2 is a diagrammatic perspective representation of a RPEC module formed in accordance with the above example of the invention.
Figure 3 is an enlarged partial transverse section of the region surrounding an interconnect within an RPEC module formed in accordance with a further example of the invention.
Referring to Figure i, this portion of the RPEC module comprises two glass substrates both of which are coated with a transparent electron conductor (TEC) coating The TEC layers are selectively isolated (3,10) in order to electrically separate each individual cell. The cathode comprises a platinum WO 00/57441 PCT/AU00/00190 electrocatalyst attached to one TEC coating the photoanode comprises ruthenium dye-sensitised titania (9) attached to the other TEC coating and an electrolyte containing a redox mediator is located between the cathode and photoanode. All of the aforementioned materials are described in more detail in US Patent 5350644. The interconnect is comprised of two different electrically conducting particles, 45um titanium and tungsten embedded within a polymeric silicone matrix in proportions by weight of 1 to 10 to 4 respectively.
Referring to Figure 2, this diagram of a RPEC module comprises two glass substrates both of which are coated with a transparent electron conductor (TEC) coating The cathode comprises a platinum electrocatalyst attached to one TEC coating The photoanode comprises ruthenium dye-sensitised titania attached to the other TEC coating Also shown are the interconnect (13) and the strips where the TEC coating has been removed (3,10).
Referring to Figure 3, a further example of a RPEC module formed in accordance with the present invention is illustrated. The same. reference numerals have been used in figure 3 for the same components as designated in figure 1 and no further description will be given of these components. Reference numeral (14) designates protective layers forming electrolyte-impermeable barriers for separating the electrolyte of individual cells.
EDITORIAL NOTE APPLICATION NUMBER 31354/00 This specification does not contain a page(s) 9.
Claims (16)
1.A regenerative photovoltaic photoelectrochemical device comprising two or more photoelectrochemical cells laminated between two substrates with opposing electrical conductors (2,11) supported upon the internal surfaces of said substrates, wherein at least one conductor and it's adjacent substrate is substantially transparent to visible light, and wherein said conductors on each substrate are each divided into electrically isolated regions, with each said cell being formed between parts of two regions of said opposing conductors and with each said cell comprising: a photoanode a cathode (11)and an electrolyte medium located between said photoanode and said cathode, and said adjacent photoelectrochemical cells are electrically interconnected in series by an 20 electrically interconnecting material comprising conductive particles where said electrically conductive particles include particles of dimensions approximating the distance between said opposing conductors.
2. The photoelectrochemical device in accordance with claim 1, wherein the conductive particles are placed S* between a separate part of the region and of said conductor adjacent said photoanode of n-th said cell and a separate part of the region of said opposing conductor adjacent to said cathode of n-th +ith said cell.
3. The photoelectrochemical device according to claim 1 or claim 2, wherein external electrical connections are made to said device via electrical contacts (7) placed upon a separate part of the region of said conductor adjacent to said cathode of the first said cell and upon a separate part of the region of said conductor adjacent to said photoanode of the last said cell.
4. The photoelectrochemical device of any one of the preceding claims, wherein said electrically interconnecting material is comprised of the conductive particles contained within a matrix.
5. The photoelectrochemical device of claim 4, wherein the matrix is a polymeric matrix.
6. The photoelectrochemical device of any one of claims 2 to 5, wherein said electrically conductive particles 20 include particles of dimensions smaller than the S* distance between said opposing conductors.
7. The photoelectrochemical device of claim 6, wherein the electrically conductive particles are of dimensions less than 5% of said distance between said opposing conductors.
8. The photoelectrochemical device of any one of claim 2 to 5, wherein said electrically conductive particles 30 are of a mixture of sizes, whereby some of said electrically conductive particles are of dimensions approximating the distance between said opposing conductors and other said electrically conductive particles are of dimensions smaller than said distance.
9. The photoelectrochemical device of claim 8, wherein the dimension of the other said electrically conductive particles are less than 5% of the distance between said opposing conductors.
The photoelectrochemical device of any one of claims 5 to 9 wherein said polymeric matrix is wholly or partially comprised of one or more electrically conducting polymer materials.
11. The photoelectrochemical device according to any one of the preceding claims wherein the conductive particles are made of Pt, W, Ti or carbon.
12. The photoelectrochemical device according to any one of the preceding claims wherein the conductive 20 particles are made of conductive oxides such as ITO, Ru oxide;
13. The photoelectrochemical device of any one of the preceding claims, wherein an additional layer of conductive polymer is placed between said conductive particles and the conductors
14. The photoelectrochemical device of anyone of the preceding claims, wherein the photoanode consists of a layer of large band gap semiconductor which is sensitised by an extremely thin, adsorbed layer of dye that absorbs a large fraction of visible light.
The photoelectrochemical device of anyone of the preceding claims, wherein an electro catalytically active material (10) being deposited on the cathode (11)
16. The photoelectrochemical device of anyone of the preceding claims, wherein the electrolyte medium contains redox mediator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU31354/00A AU761370B2 (en) | 1999-03-18 | 2000-03-17 | Methods to implement interconnects in multi-cell regenerative photovoltaic photoelectrochemical devices |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPP9317 | 1999-03-18 | ||
AUPP9317A AUPP931799A0 (en) | 1999-03-18 | 1999-03-18 | Methods to implement interconnects in multi-cell regenerative photovoltaic photoelectrochemical devices |
PCT/AU2000/000190 WO2000057441A1 (en) | 1999-03-18 | 2000-03-17 | Methods to implement interconnects in multi-cell regenerative photovoltaic photoelectrochemical devices |
AU31354/00A AU761370B2 (en) | 1999-03-18 | 2000-03-17 | Methods to implement interconnects in multi-cell regenerative photovoltaic photoelectrochemical devices |
Publications (2)
Publication Number | Publication Date |
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AU3135400A AU3135400A (en) | 2000-10-09 |
AU761370B2 true AU761370B2 (en) | 2003-06-05 |
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AU31354/00A Ceased AU761370B2 (en) | 1999-03-18 | 2000-03-17 | Methods to implement interconnects in multi-cell regenerative photovoltaic photoelectrochemical devices |
Country Status (1)
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AU (1) | AU761370B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITRM20100519A1 (en) * | 2010-10-04 | 2012-04-05 | Dyepower | ELEMENTS OF VERTICAL ELECTRICAL CONNECTION OF PHOTOELECTROCHEMICAL CELLS. |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4306404A1 (en) * | 1993-03-02 | 1994-09-08 | Abb Research Ltd | Module and method for producing it |
DE4416247A1 (en) * | 1994-05-07 | 1995-11-09 | Andreas Dr Kay | Dye-stabilised photovoltaic cell module |
-
2000
- 2000-03-17 AU AU31354/00A patent/AU761370B2/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4306404A1 (en) * | 1993-03-02 | 1994-09-08 | Abb Research Ltd | Module and method for producing it |
DE4416247A1 (en) * | 1994-05-07 | 1995-11-09 | Andreas Dr Kay | Dye-stabilised photovoltaic cell module |
DE19540712A1 (en) * | 1994-05-07 | 1997-05-07 | Ecole Polytech | Monolithic, series-connected photovoltaic modules and processes for their production |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITRM20100519A1 (en) * | 2010-10-04 | 2012-04-05 | Dyepower | ELEMENTS OF VERTICAL ELECTRICAL CONNECTION OF PHOTOELECTROCHEMICAL CELLS. |
WO2012046262A1 (en) | 2010-10-04 | 2012-04-12 | Dyepower | Vertical electrical connection of photoelectrochemical cells |
Also Published As
Publication number | Publication date |
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AU3135400A (en) | 2000-10-09 |
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