{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11271031","patent":{"patent_number":"US-11271031","title":"Back-illuminated single-photon avalanche diode","assignee":null,"inventors":[],"filing_date":"2020-05-18T00:00:00.000Z","publication_date":"2022-03-08T00:00:00.000Z","cpc_codes":["G01S","H04N","H04N","H04N","H04N","G01S"],"num_claims":18,"abstract":"A back-illuminated single-photon avalanche diode (SPAD) image sensor includes a sensor wafer stacked vertically over a circuit wafer. The sensor wafer includes one or more SPAD regions, with each SPAD region including an anode gradient layer, a cathode region positioned adjacent to a front surface of the SPAD region, and an anode avalanche layer positioned over the cathode region. Each SPAD region is connected to a voltage supply and an output circuit in the circuit wafer through inter-wafer connectors. Deep trench isolation elements are used to provide electrical and optical isolation between SPAD regions."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Back-illuminated single-photon avalanche diode","description":"A back-illuminated single-photon avalanche diode (SPAD) image sensor includes a sensor wafer stacked vertically over a circuit wafer. The sensor wafer includes one or more SPAD regions, with each SPAD","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11271031","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-11271031","citation_suggestion":"Patentable. \"Back-illuminated single-photon avalanche diode\" (US-11271031). https://patentable.app/patents/US-11271031","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11271031","json":"https://patentable.app/api/llm-context/US-11271031","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T18:05:45.055Z"}