Prior art

To identify the most relevant prior art for US Patent 10,446,700, I will retrieve the citations from the patent document itself. The patent lists "Prior art keywords" and "Prior art date" in its general information. However, to provide a comprehensive answer, I will focus on the cited references within the patent description. I will use the USPTO database to look up patent 10446700 and extract the "References Cited" section.

After accessing the patent document on the USPTO database, I will analyze each cited reference. For each relevant prior art, I will provide:

• Full citation (Patent Number, Inventor(s), Issue Date/Publication Date).
• Publication/Filing Date.
• A brief description of the invention.
• An assessment of which claim(s) of US Patent 10,446,700 it potentially anticipates under 35 U.S.C. § 102. This will involve comparing the elements of the cited prior art to the independent claims (Claim 1, 16, and 25) of US Patent 10,446,700. Anticipation under 35 U.S.C. § 102 means that every element of the claimed invention is disclosed in a single prior art reference.

(Note: I cannot directly access the USPTO database live to extract all specific "References Cited" from US10446700. The provided patent text contains some general mentions of prior art but not a complete list of cited patents or publications with their details for direct analysis. Therefore, I will perform a general search for "US10446700B2 prior art" and "USPTO patent 10446700 citations" to find readily available information about the cited prior art.)

Since I cannot directly access the USPTO database to extract the full "References Cited" section and conduct a detailed claim-by-claim analysis for anticipation against each prior art reference, I will describe the general types of prior art that would be highly relevant to US Patent 10,446,700 based on the patent's descriptions and claims.

The patent itself mentions "Prior art keywords: layer, cases, holes, mspd, chip device" and a "Prior art date: 2013-05-22". It also discusses the limitations of existing photodiodes (PDs) and avalanche photodiodes (APDs), particularly concerning silicon's transparency at longer optical wavelengths and the high multiplication noise of Germanium (Ge) and InGaAs APDs, as well as the cost and integration difficulties of InGaAs PDs and APDs with Si electronics.

Based on the patent's focus on "Microstructure enhanced absorption photosensitive devices" and its claims, the most relevant prior art would generally fall into these categories:

1. Photodiodes and Avalanche Photodiodes with Microstructures: Any prior art disclosing photodetectors (PDs) or avalanche photodiodes (APDs) that incorporate microstructures or nanostructures (such as holes, inverted pyramids, or textured surfaces) to enhance light absorption, quantum efficiency, or bandwidth, particularly in silicon, germanium, or SiGe alloys.

   • Potential Anticipation: Such references could potentially anticipate elements of Claim 1 (a single-chip device with an MSPD having holes), Claim 16 (a microstructure-enhanced photodetector with layers and holes), and Claim 25 (a method of making such a device). Specific details regarding the shape, depth, spacing, and material composition of the microstructures, as well as their location within the p-i-n or n-i-p structure, would be critical for anticipation analysis.

2. Integrated Photodetectors and Electronic Circuits on a Single Chip: Prior art describing the monolithic integration of photodetectors with active electronic circuits (e.g., CMOS, BiCMOS ASICs, TIAs) on a single substrate.

   • Potential Anticipation: These references would be highly relevant to Claim 1, which defines a "single-chip device" comprising an MSPD and an active electronic circuit. If the prior art discloses the integration of a photodetector (even without microstructures) and an active electronic circuit, it could anticipate the broader integration aspect of Claim 1. The novelty of Claim 1, in this context, lies in the microstructure-enhanced nature of the photodetector within the integrated device.

3. Specific Material Systems for Photodiodes: Prior art focusing on the use of Silicon (Si), Germanium (Ge), or Germanium-Silicon (GeSi) alloys as the absorbing material in photodetectors for specific wavelength ranges (e.g., 800-1675 nm).

   • Potential Anticipation: While the specific microstructure enhancement might be novel, if prior art discloses the fundamental material stack (e.g., N-I-P or P-I-N structures of Si, Ge, or GeSi) as described in the patent, it could form a basis for an obviousness challenge (under 35 U.S.C. § 103) when combined with other references detailing microstructures. For anticipation under § 102, a prior art would need to explicitly disclose these material layers in combination with the hole structures.

4. Fabrication Methods for Microstructures in Semiconductor Devices: Prior art detailing etching techniques (e.g., wet anisotropic etch (KOH), dry etching (DRIE, ICP), HAR etching) to create holes or textured surfaces in silicon or other semiconductor materials.

   • Potential Anticipation: These references would be highly relevant to Claim 25, which describes the "method of making a microstructure-enhanced photodetector." If a prior art document explicitly teaches the steps of forming layers and then etching holes with specific characteristics (shapes, depths, materials) into those layers, it could anticipate aspects of the method claim.

5. Optical Elements and Light Trapping Structures: Prior art on photonic crystals, anti-reflection coatings, or other optical structures designed to enhance light absorption or modify light propagation within a device.

   • Potential Anticipation: While potentially not directly anticipating a full photodetector claim, these references could be used in obviousness arguments, especially concerning the "microstructure enhanced absorption" aspect of the independent claims.

Without the specific list of "References Cited" from the patent document itself, it is not possible to provide the full citation, publication/filing dates, brief descriptions, and specific claim anticipation for each individual prior art reference.