{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:MKDAJSPRGTNUYKS6Q2ZMRA2LZR","short_pith_number":"pith:MKDAJSPR","canonical_record":{"source":{"id":"1605.05842","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-05-19T08:18:56Z","cross_cats_sorted":[],"title_canon_sha256":"6eb8e6cbed79e298fd3db057d08e0207f2394ad649b04f94479ca8439e5268a7","abstract_canon_sha256":"050b7cd4230cae7de0be019395ba9ea3c009d31265ee6dc35358079c41632c13"},"schema_version":"1.0"},"canonical_sha256":"628604c9f134db4c2a5e86b2c8834bcc79222cbfbcf1a7648827e70afecf7a8d","source":{"kind":"arxiv","id":"1605.05842","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.05842","created_at":"2026-05-18T01:04:12Z"},{"alias_kind":"arxiv_version","alias_value":"1605.05842v1","created_at":"2026-05-18T01:04:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.05842","created_at":"2026-05-18T01:04:12Z"},{"alias_kind":"pith_short_12","alias_value":"MKDAJSPRGTNU","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"MKDAJSPRGTNUYKS6","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"MKDAJSPR","created_at":"2026-05-18T12:30:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:MKDAJSPRGTNUYKS6Q2ZMRA2LZR","target":"record","payload":{"canonical_record":{"source":{"id":"1605.05842","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-05-19T08:18:56Z","cross_cats_sorted":[],"title_canon_sha256":"6eb8e6cbed79e298fd3db057d08e0207f2394ad649b04f94479ca8439e5268a7","abstract_canon_sha256":"050b7cd4230cae7de0be019395ba9ea3c009d31265ee6dc35358079c41632c13"},"schema_version":"1.0"},"canonical_sha256":"628604c9f134db4c2a5e86b2c8834bcc79222cbfbcf1a7648827e70afecf7a8d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:12.903199Z","signature_b64":"r9KRlIkVefweUEAaTtPf71AtKblnZSV0j9H98uXW39AEGJAKIiZyMJ9LOApoXKwbqFWjgn4Smk4qduIVUtW5Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"628604c9f134db4c2a5e86b2c8834bcc79222cbfbcf1a7648827e70afecf7a8d","last_reissued_at":"2026-05-18T01:04:12.902752Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:12.902752Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.05842","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:04:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YsBCAEulnpP9noXWiao65sluUqnhwFby1dLULRJV88nCJsxzKBRqEZ6oq5eGkRc39QujChmD9odFd8swfHDJCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T13:35:07.807557Z"},"content_sha256":"3a524d3a4b262aa1ab278574a77b4bddc81b8a68fd148196baae9092c69d485f","schema_version":"1.0","event_id":"sha256:3a524d3a4b262aa1ab278574a77b4bddc81b8a68fd148196baae9092c69d485f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:MKDAJSPRGTNUYKS6Q2ZMRA2LZR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First-principles study of the optoelectronic properties and photovoltaic absorber layer efficiency of Cu-based chalcogenides","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Bart Partoens, Dirk Lamoen, Nasrin Sarmadian, Rolando Saniz","submitted_at":"2016-05-19T08:18:56Z","abstract_excerpt":"Cu-based chalcogenides are promising materials for thin-film solar cells with more than 20% measured cell efficiency. Using first-principles calculations based on density functional theory, the optoelectronic properties of a group of Cu-based chalcogenides Cu$_2$-II-IV-VI$_4$ is studied. They are then screened with the aim of identifying potential absorber materials for photovoltaic applications. The spectroscopic limited maximum efficiency (SLME) introduced by Yu and Zunger is used as a metric for the screening. After constructing the current-voltage curve, the maximum spectroscopy dependent "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.05842","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:04:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pGU0xUrNYP+Fb3rmSCcP4k6Li6baa9Is7UQkpZSfxY8F1hMGL5ggKxwLfu5BTTFdeobzzB6gjQT3sYU+E+qyAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T13:35:07.807906Z"},"content_sha256":"172d35fa0286e1d7a71a55a360e38ed3acf7b8d1c83cfb00caffdd0e5dcc5357","schema_version":"1.0","event_id":"sha256:172d35fa0286e1d7a71a55a360e38ed3acf7b8d1c83cfb00caffdd0e5dcc5357"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MKDAJSPRGTNUYKS6Q2ZMRA2LZR/bundle.json","state_url":"https://pith.science/pith/MKDAJSPRGTNUYKS6Q2ZMRA2LZR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MKDAJSPRGTNUYKS6Q2ZMRA2LZR/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T13:35:07Z","links":{"resolver":"https://pith.science/pith/MKDAJSPRGTNUYKS6Q2ZMRA2LZR","bundle":"https://pith.science/pith/MKDAJSPRGTNUYKS6Q2ZMRA2LZR/bundle.json","state":"https://pith.science/pith/MKDAJSPRGTNUYKS6Q2ZMRA2LZR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MKDAJSPRGTNUYKS6Q2ZMRA2LZR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:MKDAJSPRGTNUYKS6Q2ZMRA2LZR","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"050b7cd4230cae7de0be019395ba9ea3c009d31265ee6dc35358079c41632c13","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-05-19T08:18:56Z","title_canon_sha256":"6eb8e6cbed79e298fd3db057d08e0207f2394ad649b04f94479ca8439e5268a7"},"schema_version":"1.0","source":{"id":"1605.05842","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.05842","created_at":"2026-05-18T01:04:12Z"},{"alias_kind":"arxiv_version","alias_value":"1605.05842v1","created_at":"2026-05-18T01:04:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.05842","created_at":"2026-05-18T01:04:12Z"},{"alias_kind":"pith_short_12","alias_value":"MKDAJSPRGTNU","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_16","alias_value":"MKDAJSPRGTNUYKS6","created_at":"2026-05-18T12:30:32Z"},{"alias_kind":"pith_short_8","alias_value":"MKDAJSPR","created_at":"2026-05-18T12:30:32Z"}],"graph_snapshots":[{"event_id":"sha256:172d35fa0286e1d7a71a55a360e38ed3acf7b8d1c83cfb00caffdd0e5dcc5357","target":"graph","created_at":"2026-05-18T01:04:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Cu-based chalcogenides are promising materials for thin-film solar cells with more than 20% measured cell efficiency. Using first-principles calculations based on density functional theory, the optoelectronic properties of a group of Cu-based chalcogenides Cu$_2$-II-IV-VI$_4$ is studied. They are then screened with the aim of identifying potential absorber materials for photovoltaic applications. The spectroscopic limited maximum efficiency (SLME) introduced by Yu and Zunger is used as a metric for the screening. After constructing the current-voltage curve, the maximum spectroscopy dependent ","authors_text":"Bart Partoens, Dirk Lamoen, Nasrin Sarmadian, Rolando Saniz","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-05-19T08:18:56Z","title":"First-principles study of the optoelectronic properties and photovoltaic absorber layer efficiency of Cu-based chalcogenides"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.05842","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:3a524d3a4b262aa1ab278574a77b4bddc81b8a68fd148196baae9092c69d485f","target":"record","created_at":"2026-05-18T01:04:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"050b7cd4230cae7de0be019395ba9ea3c009d31265ee6dc35358079c41632c13","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-05-19T08:18:56Z","title_canon_sha256":"6eb8e6cbed79e298fd3db057d08e0207f2394ad649b04f94479ca8439e5268a7"},"schema_version":"1.0","source":{"id":"1605.05842","kind":"arxiv","version":1}},"canonical_sha256":"628604c9f134db4c2a5e86b2c8834bcc79222cbfbcf1a7648827e70afecf7a8d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"628604c9f134db4c2a5e86b2c8834bcc79222cbfbcf1a7648827e70afecf7a8d","first_computed_at":"2026-05-18T01:04:12.902752Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:12.902752Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r9KRlIkVefweUEAaTtPf71AtKblnZSV0j9H98uXW39AEGJAKIiZyMJ9LOApoXKwbqFWjgn4Smk4qduIVUtW5Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:12.903199Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.05842","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3a524d3a4b262aa1ab278574a77b4bddc81b8a68fd148196baae9092c69d485f","sha256:172d35fa0286e1d7a71a55a360e38ed3acf7b8d1c83cfb00caffdd0e5dcc5357"],"state_sha256":"6ca77075e0b303b43a851c859f407cd5f3bc16c554b904e5cae64286ee189919"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"preov3V680eZGJDdtB6IvHx3Fj+QiKy3E4eHlE9qnq9cYcoDQCNhCjK+8OO8JEk0r9BMAf+R0TeMi0G/s7rzBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T13:35:07.809853Z","bundle_sha256":"a063fb003a47b0667ffedc21d85868a5e9836442777ba4af16820d24f52df0e5"}}