{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2020:L2SW6ZVAYWO6QNVXQOSU5XBPHU","short_pith_number":"pith:L2SW6ZVA","schema_version":"1.0","canonical_sha256":"5ea56f66a0c59de836b783a54edc2f3d31480143efb7a3fa46d0f5b719dca7fb","source":{"kind":"arxiv","id":"2010.14403","version":1},"attestation_state":"computed","paper":{"title":"Tuning the optical bandgap in hybrid layered perovskites through variation of alkyl chain length","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alexander S. Urban, Annick Hemmerling, Carlos Cardenas Daw, Jasmina A. Sichert, Jochen Feldmann","submitted_at":"2020-10-27T16:11:39Z","abstract_excerpt":"Recently, layered hybrid perovskites have been attracting huge interest due to a wide range of possible chemical compositions and the resulting tunability of the materials properties. In this study, we investigate the effect of the chain length of the organic ligands on the optical properties of stacks of two dimensional perovskite layers consisting of alkylammonium lead iodide (CnH2n+1NH3)2PbI4 with n=4-18. Photoluminescence and absorption spectroscopy reveal a blueshift with increasing chain length n including a jump of 110 meV between the n=10 and n=12 ligands due to a change in octahedral "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2010.14403","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-10-27T16:11:39Z","cross_cats_sorted":[],"title_canon_sha256":"2f47c9fa67f02bfddb1559a91b33a9e83b856daddad926bd9d67683e2edc76bf","abstract_canon_sha256":"b5dcf706d75a74dab06d3ec786f5194f00ff64d77be2f4803cb0009484ac3031"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:46:34.573727Z","signature_b64":"0jLKadJg8nhdUpqb2X04lS5/25E9CdclcLDp8ZvSGvheFG6O5OidskcuJn5y7bbotU0nhCICZhrIh6ewPq7NCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5ea56f66a0c59de836b783a54edc2f3d31480143efb7a3fa46d0f5b719dca7fb","last_reissued_at":"2026-07-05T01:46:34.573329Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:46:34.573329Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Tuning the optical bandgap in hybrid layered perovskites through variation of alkyl chain length","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alexander S. Urban, Annick Hemmerling, Carlos Cardenas Daw, Jasmina A. Sichert, Jochen Feldmann","submitted_at":"2020-10-27T16:11:39Z","abstract_excerpt":"Recently, layered hybrid perovskites have been attracting huge interest due to a wide range of possible chemical compositions and the resulting tunability of the materials properties. In this study, we investigate the effect of the chain length of the organic ligands on the optical properties of stacks of two dimensional perovskite layers consisting of alkylammonium lead iodide (CnH2n+1NH3)2PbI4 with n=4-18. Photoluminescence and absorption spectroscopy reveal a blueshift with increasing chain length n including a jump of 110 meV between the n=10 and n=12 ligands due to a change in octahedral "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.14403","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2010.14403/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2010.14403","created_at":"2026-07-05T01:46:34.573395+00:00"},{"alias_kind":"arxiv_version","alias_value":"2010.14403v1","created_at":"2026-07-05T01:46:34.573395+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.14403","created_at":"2026-07-05T01:46:34.573395+00:00"},{"alias_kind":"pith_short_12","alias_value":"L2SW6ZVAYWO6","created_at":"2026-07-05T01:46:34.573395+00:00"},{"alias_kind":"pith_short_16","alias_value":"L2SW6ZVAYWO6QNVX","created_at":"2026-07-05T01:46:34.573395+00:00"},{"alias_kind":"pith_short_8","alias_value":"L2SW6ZVA","created_at":"2026-07-05T01:46:34.573395+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU","json":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU.json","graph_json":"https://pith.science/api/pith-number/L2SW6ZVAYWO6QNVXQOSU5XBPHU/graph.json","events_json":"https://pith.science/api/pith-number/L2SW6ZVAYWO6QNVXQOSU5XBPHU/events.json","paper":"https://pith.science/paper/L2SW6ZVA"},"agent_actions":{"view_html":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU","download_json":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU.json","view_paper":"https://pith.science/paper/L2SW6ZVA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2010.14403&json=true","fetch_graph":"https://pith.science/api/pith-number/L2SW6ZVAYWO6QNVXQOSU5XBPHU/graph.json","fetch_events":"https://pith.science/api/pith-number/L2SW6ZVAYWO6QNVXQOSU5XBPHU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU/action/storage_attestation","attest_author":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU/action/author_attestation","sign_citation":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU/action/citation_signature","submit_replication":"https://pith.science/pith/L2SW6ZVAYWO6QNVXQOSU5XBPHU/action/replication_record"}},"created_at":"2026-07-05T01:46:34.573395+00:00","updated_at":"2026-07-05T01:46:34.573395+00:00"}