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Author

Rafael Ricolcol

Bio: Rafael Ricolcol is an academic researcher. The author has contributed to research in topics: Thin film & Silicon. The author has an hindex of 4, co-authored 5 publications receiving 84 citations.

Papers
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Patent
23 Apr 2011
TL;DR: In this article, a method and structure for obtaining ultra-low surface recombination velocities from highly efficient surface passivation in crystalline silicon substrate-based solar cells by utilizing a bi-layer passivation scheme which also works as an efficient ARC.
Abstract: The disclosed subject matter provides a method and structure for obtaining ultra-low surface recombination velocities from highly efficient surface passivation in crystalline silicon substrate- based solar cells by utilizing a bi-layer passivation scheme which also works as an efficient ARC. The bi-layer passivation consists of a first thin layer of wet chemical oxide or a thin hydrogenated amorphous silicon layer. A second layer of amorphous hydrogenated silicon nitride film is deposited on top of the wet chemical oxide or amorphous silicon film. This deposition is then followed by annealing to further enhance the surface passivation.

32 citations

Patent
08 Mar 2010
TL;DR: In this paper, a conformal sacrificial porous semiconductor layer on a template is formed on top of the porous silicon layer, and the middle porous layer is then selectively etched to separate the TFSS and semiconductor template.
Abstract: The present disclosure relates to methods for selectively etching a porous semiconductor layer to separate a thin-film semiconductor substrate (TFSS) having planar or three-dimensional features from a corresponding semiconductor template. The method involves forming a conformal sacrificial porous semiconductor layer on a template. Next, a conformal thin film silicon substrate is formed on top of the porous silicon layer. The middle porous silicon layer is then selectively etched to separate the TFSS and semiconductor template. The disclosed advanced etching chemistries and etching methods achieve selective etching with minimal damage to the TFSS and template.

25 citations

Patent
13 Aug 2011
TL;DR: In this article, a semiconductor wafer is repeatedly used as a template and carrier for fabricating high efficiency capable thin semiconductor solar cells substrates, and mechanisms that enable repeated use of these templates at consistent quality and with high yield are disclosed.
Abstract: Mechanisms are disclosed by which a semiconductor wafer, silicon in some embodiments, is repeatedly used to serve as a template and carrier for fabricating high efficiency capable thin semiconductor solar cells substrates. Mechanisms that enable such repeated use of these templates at consistent quality and with high yield are disclosed.

16 citations

Patent
31 Dec 2011
TL;DR: In this article, the subject matter pertains to deposition of thin film or thin foil materials in general, but more specifically, deposition of epitaxial monocrystalline or quasi-monocrystaline silicon film (epi film) for use in manufacturing of high efficiency solar cells.
Abstract: The disclosed subject matter pertains to deposition of thin film or thin foil materials in general, but more specifically to deposition of epitaxial monocrystalline or quasi-monocrystalline silicon film (epi film) for use in manufacturing of high efficiency solar cells. In operation, methods are disclosed which extend the reusable life and to reduce the amortized cost of a substrate or template used in the manufacturing process of silicon solar cells. Further, methods are disclosed which provide for the conversion of a low quality starting surface into an improved quality starting surface of a silicon wafer.

11 citations


Cited by
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Patent
04 Feb 2010
TL;DR: In this paper, a solar cell and a method for manufacturing the same is described, which includes a substrate of a first conductive type, an anti-reflection layer that is positioned on the substrate and is formed of a transparent conductive oxide material.
Abstract: A solar cell and a method for manufacturing the same are disclosed. The solar cell includes a substrate of a first conductive type, an anti-reflection layer that is positioned on the substrate and is formed of a transparent conductive oxide material, a plurality of emitter layers on the substrate, the plurality of emitter layers being of a second conductive type opposite the first conductive type, a plurality of first electrodes on the plurality of emitter layers, and a plurality of second electrodes that are electrically connected to the substrate and are positioned to be spaced apart from the plurality of first electrodes. The first electrodes and the second electrodes are positioned on the same surface of the substrate.

112 citations

Patent
09 Dec 2010
TL;DR: The back contact back junction solar cell as discussed by the authors comprises a substrate having a light capturing frontside surface with a passivation layer, a doped base region, and an doped backside emitter region with a polarity opposite the doped ground region.
Abstract: Back contact back junction solar cell and methods for manufacturing are provided. The back contact back junction solar cell comprises a substrate having a light capturing frontside surface with a passivation layer, a doped base region, and a doped backside emitter region with a polarity opposite the doped base region. A backside passivation layer and patterned reflective layer on the emitter form a light trapping backside mirror. An interdigitated metallization pattern is positioned on the backside of the solar cell and a permanent reinforcement provides support to the cell.

77 citations

Patent
05 Aug 2011
TL;DR: In this paper, a backplane for back contact solar cells that provides for solar cell substrate reinforcement and electrical interconnects is described, which comprises depositing an inter-digitated pattern of base electrodes and emitter electrodes on a backside surface of a semiconductor substrate, forming electrically conductive emitter plugs and base plugs on the inter-determined pattern, and attaching a second backplane having a second inter-decomposition pattern of EB electrodes and EB electrodes at the conductive EB and EB plugs.
Abstract: Fabrication methods and structures relating to backplanes for back contact solar cells that provide for solar cell substrate reinforcement and electrical interconnects are described. The method comprises depositing an interdigitated pattern of base electrodes and emitter electrodes on a backside surface of a semiconductor substrate, forming electrically conductive emitter plugs and base plugs on the interdigitated pattern, and attaching a backplane having a second interdigitated pattern of base electrodes and emitter electrodes at the conductive emitter and base plugs to form electrical interconnects.

63 citations

Journal ArticleDOI
TL;DR: This review provides an in-depth analysis of MACE to enhance Si solar cells, including the outlook for commercial applications of this technology.
Abstract: Metal-assisted catalyzed etching (MACE) of silicon (Si) is a controllable, room-temperature wet-chemical technique that uses a thin layer of metal to etch the surface of Si, leaving behind various nano- and micro-scale surface features, including nanowires (NWs), that can be tuned to achieve various useful engineering goals, in particular with respect to Si solar cells. In this review, we introduce the science and technology of MACE from the literature, and provide an in-depth analysis of MACE to enhance Si solar cells, including the outlook for commercial applications of this technology.

60 citations

Patent
03 Dec 2012
TL;DR: In this paper, a three-dimensional thin-film solar cell with a prism array design is proposed, which consists of a plurality of dual-aperture unit cells with emitter junction regions and doped base regions.
Abstract: A three-dimensional thin-film solar cell comprising a three-dimensional thin-film solar cell substrate having a prism array design comprising a plurality dual-aperture unit cells with emitter junction regions and doped base regions. The three-dimensional thin-film solar cell comprises emitter metallization regions and base metallization regions.

52 citations