The present invention relates to photovoltaic cells and more particularly to photovoltaic cells that use n-type and p-type nano-particles suspended in an active layer.
Today there is significant interest in renewable and environmentally friendly energy resources. Photovoltaic and other solar cell technologies are of particular interest and deemed to be important for present and future energy needs and applications. Crystalline silicon (Si) solar cells are the most prevalent today given the current state of the art. Crystalline silicon solar cells are based on the formation of a junction between n-type and p-type materials, wherein, as is known in the art, n-type materials have electrons as the majority carries and p-type materials have holes as the majority carriers.
Referring now to
Referring now to
To address the deficiencies found in the silicon crystalline solar cell approach, multi-junction approaches have been tried. Typically such multi-junction solar cells are based on multiple junctions formed by III-V compound semiconductor materials. While these solar cells extended solar absorption as compared to crystalline silicon solar cells, they still do not fully exploit the blue shift in the solar spectrum as is shown with respect to
Referring now to
Referring now to
While the multi-junction solar cell of the type described above is an improvement over the typical crystalline silicon solar cell, it still does not fully exploit the blue shift in the solar spectrum and is prohibitively expensive to manufacture. Thus multi-junction solar cells are primarily restricted to space applications. Further, multi-junction solar cells of the type described above are structurally rigid and not feasible for use in wide area applications.
What is desired, therefore, is a solar cell that can take advantage of even more of the available solar spectrum, can be economically manufactured, and has the possibility of being manufactured in a flexible embodiment for use in various applications not possible for a structurally rigid solar cell.
According to an embodiment of the present invention, a photovoltaic cell includes a substrate layer, an anode layer on the substrate layer, an active layer on the anode layer, and a cathode layer on the active layer, wherein the active layer comprises a plurality of disparately sized n-type and p-type nano-particles of different semiconductor materials randomly distributed in a conductive polymer blend. The n-type nano-particles can include either zinc oxide (ZnO) or indium (III) oxide (In2O3) nano-particles, and the p-type nano-particles can include either nickel (II) oxide (NiO) or lanthanum oxide (La2O3) nano-particles. The conductive polymer blend can include poly(3-hexyl)thiophene, known as P3HT. The bandgaps of the nano-particles have corresponding energies ranging from the near ultraviolet to the far infrared. The nano-particles respond to different wavelengths, and thereby different parts of the spectrum. The photovoltaic cell according to the present invention can comprise a flexible photovoltaic cell wherein the substrate layer comprises a flexible layer made of polymer or any other appropriate material. The anode layer can include indium tin oxide (ITO), and the cathode layer can include gold or aluminum. An interfacial layer can be interposed between the active layer and the cathode layer, wherein the interfacial layer can include a plurality of gold nano-particles in a conductive polymer. The conductive polymer can include poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate), known as PEDOT: PSS. The interfacial layer can also be interposed between the active layer and the anode layer, wherein the interfacial layer can include a plurality of titanium dioxide (TiO2) nano-particles in a conductive polymer. The conductive polymer for this interfacial layer can also include PEDOT: PSS. The photovoltaic cell of the present invention can also include gold or silver nano-particles.
According to another embodiment of the present invention, a photovoltaic cell includes a substrate layer, an anode layer on the substrate layer, an n-type nano-structured layer on the anode layer, an active layer on the anode layer, and a cathode layer on the active layer, wherein the active layer comprises a plurality of disparately sized p-type nano-particles of different semiconductor materials randomly distributed in a conductive polymer blend. The n-type nano-structured layer can include nano-imprinted TiO2 or ZnO putty, and the n-type nano-structured layer can further include a gold or silver layer.
According to another embodiment of the present invention, a method of manufacturing a photovoltaic cell includes providing a substrate layer, forming an anode layer on the substrate layer, forming an active layer on the anode layer, and forming a cathode layer on the active layer, wherein the active layer comprises a plurality of disparately sized n-type and p-type nano-particles of different semiconductor materials randomly distributed in a conductive polymer blend.
According to another embodiment of the present invention, a method of manufacturing a photovoltaic cell includes providing a substrate layer, providing an anode layer on the substrate layer, providing an n-type nano-structured layer on the anode layer, providing an active layer on the anode layer, and providing a cathode layer on the active layer, wherein the active layer comprises a plurality of disparately sized p-type nano-particles of different semiconductor materials randomly distributed in a conductive polymer blend.
The patent of application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
Referring now to
In
As shown in
Some of the advantages of the solar cell 500 according to the present invention include the utilization of the entire solar spectrum (including the blue shift) in a single device structure that is relatively simple to manufacture and can thus be made economically. Solar cell 500 exhibits a high conversion efficiency, which can be improved by plasmonic enhancement from noble metal nano-particles that is described in further detail below. Many different embodiments and variations of the basic solar cell 500 shown in
Another embodiment of the solar cell according to the present invention is shown in
Another embodiment of the photovoltaic cell of the present invention can also include gold or silver nano-particles. Solar cell 700 receives solar radiation 702 and includes a cathode layer 704, active layer 706 with gold or silver nano-particles 716, an anode layer 708, and a substrate layer 710. The active layer also includes p-type nano-particles 712 and n-type nano-particles 714 as previously described. Gold or silver nano-particles 716 are incorporated in the active layer 706 together with the n-type nano-particles 714 (ZnO, In2O3) and the p-type nano-particles 712 (NiO, La2O3). As previously described, the conductive polymer used in the active layer 706 can include P3HT. The incorporation of the gold or silver nano-particles create plasmonic enhancement, which yields an increase in efficiency of the solar cell.
Another embodiment of the photovoltaic cell of present invention is shown in
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According to another embodiment of the present invention, a method of manufacturing a photovoltaic cell 500 shown in
According to another embodiment of the present invention, a method of manufacturing a photovoltaic cell 800 shown in
This application is a divisional application of U.S. application Ser. No. 14/871,370 filed on Sep. 30, 2015, which claims priority to U.S. Provisional Application 62/059,595, filed on Oct. 3, 2014, the contents of which are herein incorporated by reference in its entirety.
This invention was made with government support under W911NF-11-1-0214 awarded by The Department of the Army. The government has certain rights in the invention.
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20200144524 A1 | May 2020 | US |
Number | Date | Country | |
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62059595 | Oct 2014 | US |
Number | Date | Country | |
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Parent | 14871370 | Sep 2015 | US |
Child | 16704876 | US |