{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:NA5S3KPI6T7VSKW2QQHM5HLMBZ","short_pith_number":"pith:NA5S3KPI","canonical_record":{"source":{"id":"1507.07343","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-07-27T09:38:59Z","cross_cats_sorted":[],"title_canon_sha256":"33c63e3749a532136fd3b473cebd160240a53e2024d34bf390a1af351b1be037","abstract_canon_sha256":"576894e943bf5c246a79d8e544712524207f4c339d155da84b91d00d59372439"},"schema_version":"1.0"},"canonical_sha256":"683b2da9e8f4ff592ada840ece9d6c0e7ccb1b580842a0d4ca49d47c40797135","source":{"kind":"arxiv","id":"1507.07343","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.07343","created_at":"2026-05-18T01:36:16Z"},{"alias_kind":"arxiv_version","alias_value":"1507.07343v1","created_at":"2026-05-18T01:36:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.07343","created_at":"2026-05-18T01:36:16Z"},{"alias_kind":"pith_short_12","alias_value":"NA5S3KPI6T7V","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"NA5S3KPI6T7VSKW2","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"NA5S3KPI","created_at":"2026-05-18T12:29:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:NA5S3KPI6T7VSKW2QQHM5HLMBZ","target":"record","payload":{"canonical_record":{"source":{"id":"1507.07343","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-07-27T09:38:59Z","cross_cats_sorted":[],"title_canon_sha256":"33c63e3749a532136fd3b473cebd160240a53e2024d34bf390a1af351b1be037","abstract_canon_sha256":"576894e943bf5c246a79d8e544712524207f4c339d155da84b91d00d59372439"},"schema_version":"1.0"},"canonical_sha256":"683b2da9e8f4ff592ada840ece9d6c0e7ccb1b580842a0d4ca49d47c40797135","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:16.587913Z","signature_b64":"0v5AsALDicWaaVpOvnS3K8wjZjeeosAPb2fGmFrdK06V78Q2IqvEf370VU29R73R0QtCNEvSYGDhIjsq0mrVAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"683b2da9e8f4ff592ada840ece9d6c0e7ccb1b580842a0d4ca49d47c40797135","last_reissued_at":"2026-05-18T01:36:16.587277Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:16.587277Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.07343","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":"2026-05-18T01:36:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M7pL/oS9WRzRd0yN5pkQk9tYTBc+M/jQr0DavCXU+D4sJnm61Ua3AK0wOGoX/74+fxojM1bg5pVUOHFhlOeQDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:17:53.335203Z"},"content_sha256":"2263a18d19b2d6f9564c04e57704e5146cc4499909a3ec1e648a1cc0fd0edaea","schema_version":"1.0","event_id":"sha256:2263a18d19b2d6f9564c04e57704e5146cc4499909a3ec1e648a1cc0fd0edaea"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:NA5S3KPI6T7VSKW2QQHM5HLMBZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Phosphorene and Transition Metal Dichalcogenide 2D Heterojunctions: Application in Excitonic Solar Cells","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chun Zhang, Lei Shen, Vellayappan Dheivanayagam S/O Ganesan, Yuan Ping Feng","submitted_at":"2015-07-27T09:38:59Z","abstract_excerpt":"Using the first-principles GW-Bethe-Salpeter equation method, here we study the excited-state properties, including quasi-particle band structures and optical spectra, of phosphorene, a two-dimensional (2D) atomic layer of black phosphorus. The quasi-particle band gap of monolayer phosphorene is 2.15 eV and its optical gap is 1.6 eV, which is suitable for excitonic thin film solar cell applications. Next, this potential application is analysed by considering type-II heterostructures with single layered phosphorene and transition metal dichalcogenides (TMDs). These heterojunctions have a potent"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.07343","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":"2026-05-18T01:36:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eexGnZY9dLtACdmAqGNfADA8S49ZJppT1Y/E1/roFwLNcvAMMm8flUqHSJCu8eERVBDQ3xQXv9qiBPvfvxuiCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:17:53.335557Z"},"content_sha256":"b4215c3b5eb0913ba2f61c4214ae53e761de5bfadd03c50e9a26c10c39ceec52","schema_version":"1.0","event_id":"sha256:b4215c3b5eb0913ba2f61c4214ae53e761de5bfadd03c50e9a26c10c39ceec52"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NA5S3KPI6T7VSKW2QQHM5HLMBZ/bundle.json","state_url":"https://pith.science/pith/NA5S3KPI6T7VSKW2QQHM5HLMBZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NA5S3KPI6T7VSKW2QQHM5HLMBZ/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":"2026-05-30T07:17:53Z","links":{"resolver":"https://pith.science/pith/NA5S3KPI6T7VSKW2QQHM5HLMBZ","bundle":"https://pith.science/pith/NA5S3KPI6T7VSKW2QQHM5HLMBZ/bundle.json","state":"https://pith.science/pith/NA5S3KPI6T7VSKW2QQHM5HLMBZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NA5S3KPI6T7VSKW2QQHM5HLMBZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:NA5S3KPI6T7VSKW2QQHM5HLMBZ","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":"576894e943bf5c246a79d8e544712524207f4c339d155da84b91d00d59372439","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-07-27T09:38:59Z","title_canon_sha256":"33c63e3749a532136fd3b473cebd160240a53e2024d34bf390a1af351b1be037"},"schema_version":"1.0","source":{"id":"1507.07343","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.07343","created_at":"2026-05-18T01:36:16Z"},{"alias_kind":"arxiv_version","alias_value":"1507.07343v1","created_at":"2026-05-18T01:36:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.07343","created_at":"2026-05-18T01:36:16Z"},{"alias_kind":"pith_short_12","alias_value":"NA5S3KPI6T7V","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"NA5S3KPI6T7VSKW2","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"NA5S3KPI","created_at":"2026-05-18T12:29:32Z"}],"graph_snapshots":[{"event_id":"sha256:b4215c3b5eb0913ba2f61c4214ae53e761de5bfadd03c50e9a26c10c39ceec52","target":"graph","created_at":"2026-05-18T01:36:16Z","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":"Using the first-principles GW-Bethe-Salpeter equation method, here we study the excited-state properties, including quasi-particle band structures and optical spectra, of phosphorene, a two-dimensional (2D) atomic layer of black phosphorus. The quasi-particle band gap of monolayer phosphorene is 2.15 eV and its optical gap is 1.6 eV, which is suitable for excitonic thin film solar cell applications. Next, this potential application is analysed by considering type-II heterostructures with single layered phosphorene and transition metal dichalcogenides (TMDs). These heterojunctions have a potent","authors_text":"Chun Zhang, Lei Shen, Vellayappan Dheivanayagam S/O Ganesan, Yuan Ping Feng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-07-27T09:38:59Z","title":"Phosphorene and Transition Metal Dichalcogenide 2D Heterojunctions: Application in Excitonic Solar Cells"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.07343","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":"sha256:2263a18d19b2d6f9564c04e57704e5146cc4499909a3ec1e648a1cc0fd0edaea","target":"record","created_at":"2026-05-18T01:36:16Z","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":"576894e943bf5c246a79d8e544712524207f4c339d155da84b91d00d59372439","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-07-27T09:38:59Z","title_canon_sha256":"33c63e3749a532136fd3b473cebd160240a53e2024d34bf390a1af351b1be037"},"schema_version":"1.0","source":{"id":"1507.07343","kind":"arxiv","version":1}},"canonical_sha256":"683b2da9e8f4ff592ada840ece9d6c0e7ccb1b580842a0d4ca49d47c40797135","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"683b2da9e8f4ff592ada840ece9d6c0e7ccb1b580842a0d4ca49d47c40797135","first_computed_at":"2026-05-18T01:36:16.587277Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:16.587277Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0v5AsALDicWaaVpOvnS3K8wjZjeeosAPb2fGmFrdK06V78Q2IqvEf370VU29R73R0QtCNEvSYGDhIjsq0mrVAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:16.587913Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.07343","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2263a18d19b2d6f9564c04e57704e5146cc4499909a3ec1e648a1cc0fd0edaea","sha256:b4215c3b5eb0913ba2f61c4214ae53e761de5bfadd03c50e9a26c10c39ceec52"],"state_sha256":"99474ef66f915089c7429728632f7c256739730802285520689f803fe1be2fcb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OuQB5Q/GeagUBI+ecNQk9wEmWaJZGDsVxC1TCeEpJ5AQ636iy2RmK2o0EtjXVLFRs2OPLbsHB7c9WWVBf1wSBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T07:17:53.337481Z","bundle_sha256":"35eddf47163e44be4a435f8acc8c0fcfca5dae7b2a0f648bb8f4d47251a26fe7"}}