CN1300858C - Multi-band-gap cascaded structural organic solar battery - Google Patents
Multi-band-gap cascaded structural organic solar battery Download PDFInfo
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- CN1300858C CN1300858C CNB2004100378435A CN200410037843A CN1300858C CN 1300858 C CN1300858 C CN 1300858C CN B2004100378435 A CNB2004100378435 A CN B2004100378435A CN 200410037843 A CN200410037843 A CN 200410037843A CN 1300858 C CN1300858 C CN 1300858C
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- 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
Abstract
The present invention relates to an organic solar battery with a multi-band-gap series structure, which belongs to a solar battery device. An organic solar battery with a two-band-gap series structure has an embodiment that a multi-layer film structure of titanium dioxide TiO2 (3), poly 2-methoxy-5-(2-ethylethoxy)-p-phenylenevinylene MEH-PPV (4), thin-layer transparent medium electrode metal Au (5), bis-benzimidazole-substituted-3, 4, 9, 10-tetracarboxy-perylene PTCBI (6), copper phthalocyanine CuPc (7) and back electrode metal (Au) (8) is orderly arranged on ITO transparent conductive glass (1.2) by a coating method or a vacuum evaporation method. Two or more organic photovoltaic elementary batteries with different waveband absorbing ranges are orderly arranged on the same substrate to obtain a multi-battery series system. Because photons with different energy in sunlight are respectively absorbed by single batteries corresponding to the photons, energy consumption caused by in-band relaxation is reduced, and sunlight energy conversion efficiency is greatly increased.
Description
Technical field
The present invention relates to a kind of solar cell device.
Background technology
Solar battery technology based on semiconductors such as silicon is comparatively ripe, but the cost of these solar cells is still higher at present, can only use in some special occasions.Make solar power generation obtain large-scale promotion, just must reduce the solar cell cost, or find more cheap solar cell material and technology.
Organic semiconductor comprises micromolecule and polymeric material, is a class new type solar energy material that is rising in the world.Compare with inorganic semiconductor, the organic material light absorption is strong, can prepare film forming by straightforward procedures such as spin coating, ink-jet, vacuum thermal evaporations.Therefore be expected to mass preparation low cost, frivolous, the organic solar batteries that can curl, can use flexibly.Yet the conversion efficiency of organic solar batteries is also lower at present, is lower than 5%.Need further to improve.
Existing solar cell comprises inorganic and has machine battery to have an energy efficiency limit, is about about 33%.Reason is for certain specific photovoltaic material, have only energy just can be absorbed and cause photo-generated carrier in the solar spectrum greater than the photon of its energy gap, and absorbed photon, no matter how high its energy have, it can not surpass the numerical value of its energy gap to the contribute energy of external circuit, its complementary energy by consumed in vain the band in relaxation process in, change into heat.For solar spectrum, there is the energy gap an of the best, for about 1.4eV.Even yet adopt this optimum data, for above-mentioned reasons, the energy conversion efficiency limit of optimal element cell only is about 33% in theory.
Summary of the invention
Technical problem solved by the invention is: the energy conversion efficiency that improves organic solar batteries.
Technical scheme of the present invention is:
Many band gap cascaded structure organic solar batteries, on same substrate, method by coating or vacuum evaporation, prepare the organic photovoltaic cells battery that two or more has different absorption bands scopes successively, obtain a kind of series system of many batteries, the different frequency range of incident sunlight is absorbed by different element cells respectively
Because therefore the absorption bands scope difference of each element cell in this system requires the organic material in the different element cells should have different band gap widths.
The different photovoltaic cell of a series of absorption bands scopes is together in series from the shortwave to the long wave successively, allows sunlight from the short battery-end incident of absorption bands, then incident light will be absorbed by these batteries respectively according to energy order from big to small on frequency spectrum.The element cell that absorption bands is short is because organic material greater band gap wherein can produce high light voltage.The long battery of absorption bands is then exported low voltage.The whole system output voltage is all single battery voltage sums.The sunlight of nearly all frequency spectrum all can be absorbed in this system, and the big photon of energy can't be most energy consumption in band in the relaxation process, but external circuit is had bigger contribute energy.Therefore this many band gap cascaded structure will increase the energy conversion efficiency to sunlight greatly.If series connected battery is abundant, and each unit component all reaches ideal performance, and then the energy conversion efficiency of whole system will be multiplied considerably beyond the efficient limit of monocell.This can allow light successively by, seem simple series-connected cell system because inorganic solar cell material and preparation technology's restriction, and be not easy to realize.Characteristics have determined the high series-connected cell system of this efficient can adopt organic functional material to realize yet the extensive alternative of organic material, organic film preparation method's simplicity and the target in the device can be very thin (several nanometers, thereby light transmission is good) etc.In addition, preparation organic solar batteries and the series system that forms also can realize on inorganic solar cell.
The invention has the beneficial effects as follows: owing to adopt many band gap cascaded structure, the photon of different-energy by corresponding monocell absorption with it, has reduced the energy loss that relaxation causes in the band respectively in the sunlight, increases the energy conversion efficiency to sunlight greatly.
Description of drawings
The photovoltaic cell of two different absorption bands scopes of Fig. 1 is formed an instantiation of cascaded structure.
Among the figure: transparent glass substrate 1, ITO conductive film 2, titanium dioxide TiO
23, poly-2-methoxyl group 5-(2-ethyl hexyl oxy) is to phenylacetylene MEH-PPV 4, transparent target gold Au 5, bisbenzimidazole generation-3,4,9,10-tetracarboxylic acid Ji perylene PTCBI 6, CuPc CuPc 7, back electrode gold Au 8.
Embodiment
Fig. 1 is the instantiation that the solar battery group of two different absorption bands scopes becomes cascaded structure.It is on the ITO transparent conducting glass, by the method for coating or vacuum evaporation, prepares multi-layer film structure as shown in the figure successively: titanium dioxide TiO
23, poly-2-methoxyl group 5-(2-ethyl hexyl oxy) is to phenylacetylene MEH-PPV 4, the transparent target gold of thin layer Au 5, bisbenzimidazole generation-3,4,9,10-tetracarboxylic acid Ji perylene PTCBI 6, CuPc CuPc 7, back electrode gold Au 8 so just make one two band gap cascaded structure organic solar batteries.Its structure can be expressed as two different absorption bands scope solar cell ITO/TiO
2The cascaded structure that/MEH-PPV/Au and Au/PTCBI/CuPc/Au form.Because the band gap of MEH-PPV is wideer than PTCBI and CuPc, incident light shortwave part is absorbed by first battery, produces than about 0.9 volt of high output voltage, and the long wave part is absorbed by second battery, produces than about 0.5 volt of low output voltage.The whole system output voltage is these two single battery voltage sums.After bed thickness optimization, the energy conversion efficiency of series-connected cell is higher than the wherein efficient of any one monocell.
In like manner, can realize the series system of the solar cell composition of a plurality of different absorption bands scopes.Select several organic photovoltaic battery structures that have different absorption bands scopes respectively.During fabricate devices, according to absorption bands length, the method by coating or vacuum evaporation prepares these organic photovoltaic batteries successively, finally obtains a kind of series system of many batteries on transparent substrates.Allow sunlight from the incident of short absorption bands battery-end and successively by these batteries, incident light is absorbed by these batteries respectively according to energy order from big to small on frequency spectrum.The battery that absorption bands is short is because the greater band gap of organic material wherein can produce higher photovoltage.The long battery of absorption bands is then exported low voltage.The whole system output voltage is all single battery voltage sums.After optimizing, the energy conversion efficiency of series-connected cell is higher than the wherein efficient of any one monocell.
Claims (1)
1. many band gap cascaded structure organic solar batteries, it is characterized in that: on same substrate, method by coating or vacuum evaporation, prepare the organic photovoltaic cells battery that two or more has different absorption bands scopes successively, obtain a kind of series system of many batteries, the different frequency range of incident sunlight is absorbed by different element cells respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100378435A CN1300858C (en) | 2004-05-12 | 2004-05-12 | Multi-band-gap cascaded structural organic solar battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100378435A CN1300858C (en) | 2004-05-12 | 2004-05-12 | Multi-band-gap cascaded structural organic solar battery |
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| Publication Number | Publication Date |
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| CN1571171A CN1571171A (en) | 2005-01-26 |
| CN1300858C true CN1300858C (en) | 2007-02-14 |
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| CNB2004100378435A Expired - Fee Related CN1300858C (en) | 2004-05-12 | 2004-05-12 | Multi-band-gap cascaded structural organic solar battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179109B (en) * | 2007-12-17 | 2010-06-02 | 中国科学院长春应用化学研究所 | Stacking organic photovoltaic power cell taking three layers organic hetero-junction thin film as middle electric pole |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697359B (en) * | 2009-10-26 | 2012-01-25 | 新奥光伏能源有限公司 | Solar cell |
| CN101820237B (en) * | 2010-03-16 | 2013-11-27 | 香港应用科技研究院有限公司 | Small photovoltaic device |
| CN101923785B (en) * | 2010-03-17 | 2012-04-25 | 甄玉凤 | Organic solar traffic light |
| TWI425690B (en) * | 2010-12-31 | 2014-02-01 | Au Optronics Corp | Stacked photovoltaic cell module |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6657378B2 (en) * | 2001-09-06 | 2003-12-02 | The Trustees Of Princeton University | Organic photovoltaic devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6657378B2 (en) * | 2001-09-06 | 2003-12-02 | The Trustees Of Princeton University | Organic photovoltaic devices |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179109B (en) * | 2007-12-17 | 2010-06-02 | 中国科学院长春应用化学研究所 | Stacking organic photovoltaic power cell taking three layers organic hetero-junction thin film as middle electric pole |
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| CN1571171A (en) | 2005-01-26 |
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Granted publication date: 20070214 Termination date: 20100512 |