Method for Electrochemical Hydrogen Passivation of Semiconductor Layers

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The invention describes an electrochemical method to hydrogen-passivate semiconductor layers. By immersing the semiconductor as a cathode in an electrolysis setup with a specific electrolyte containing a proton source, hydrogen atoms are introduced into the semiconductor material. This process effectively saturates dangling bonds within the semiconductor, improving its properties—particularly those sensitive to defects, like silicon in solar cells or other electronic devices. The process is conducted at low temperatures, potentially even room temperature, and does not require vacuum, high heat, or plasma treatments.

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• Manufacturing and improving silicon-based solar cells by reducing defects and enhancing efficiency.
• Treatment of semiconductor layers in microelectronic devices, such as transistors and integrated circuits, to increase performance and reliability.
• Post-processing of thin-film semiconductors in sensors and optoelectronic devices.
• Preparation of semiconductor materials for high-performance photodetectors, LEDs, and display technologies.
• Research and development labs for rapid, cost-effective semiconductor passivation without advanced high-temperature or vacuum equipment.

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• Enables hydrogen passivation at low or moderate temperatures, sometimes at room temperature, avoiding need for expensive high-temperature processes.
• Reduces or eliminates need for vacuum systems, plasma treatments, or irradiation, simplifying setups and reducing operational costs.
• Improves uniformity and depth of passivation due to full immersion and electrochemical control.
• Suitable for a wide variety of semiconductor materials, including silicon and compound semiconductors, broadening its industrial applicability.
• May increase charge transport in devices (like solar cells) by reducing recombination at defects, thus enhancing efficiency.
• Scalable and adaptable to different production methods and device geometries.

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Patent Abstract

The present invention relates to a method for the hydrogen passivation of semiconductor layers, wherein the semiconductor layer (1) to be passivated is electrochemically passivated. In the context of the method according to the invention, in particular the semiconductor layer (1) to be passivated can be inserted as a cathode into an electrolysis apparatus comprising an anode (3) and an electrolyte (2) containing a proton source, and an electrolysis voltage can be applied to the semiconductor (1) and the anode (3). Furthermore, the present invention relates to semiconductor layers obtainable by the method according to the invention.