{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WD3O5WATV2L6C7TBSPGN4CNCAC","short_pith_number":"pith:WD3O5WAT","canonical_record":{"source":{"id":"1805.10152","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-05-25T13:38:42Z","cross_cats_sorted":["physics.comp-ph","physics.optics"],"title_canon_sha256":"3cfc780e4c293ee1421892544b55de800795592a6e9f73c41c5cf04ea663130a","abstract_canon_sha256":"f378ccd59904812b4a82342e6f57b10b197478f416b3bc9d401febff3eed3774"},"schema_version":"1.0"},"canonical_sha256":"b0f6eed813ae97e17e6193ccde09a2008f40c5225664c09c85d20dc6a0e59b1c","source":{"kind":"arxiv","id":"1805.10152","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.10152","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"arxiv_version","alias_value":"1805.10152v1","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.10152","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"pith_short_12","alias_value":"WD3O5WATV2L6","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"WD3O5WATV2L6C7TB","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"WD3O5WAT","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WD3O5WATV2L6C7TBSPGN4CNCAC","target":"record","payload":{"canonical_record":{"source":{"id":"1805.10152","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-05-25T13:38:42Z","cross_cats_sorted":["physics.comp-ph","physics.optics"],"title_canon_sha256":"3cfc780e4c293ee1421892544b55de800795592a6e9f73c41c5cf04ea663130a","abstract_canon_sha256":"f378ccd59904812b4a82342e6f57b10b197478f416b3bc9d401febff3eed3774"},"schema_version":"1.0"},"canonical_sha256":"b0f6eed813ae97e17e6193ccde09a2008f40c5225664c09c85d20dc6a0e59b1c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:53.056871Z","signature_b64":"K/kTAMwt87DA/Fa6HqnRHbWGFjodUUdiNYapV3KSM0pXXcGnXfc6WhuE/Z4o1xSsQMEef2hXV+EnXUtbN6mEAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b0f6eed813ae97e17e6193ccde09a2008f40c5225664c09c85d20dc6a0e59b1c","last_reissued_at":"2026-05-18T00:14:53.056235Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:53.056235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.10152","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":"2026-05-18T00:14:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wjEagrvdGm4KoXGWUnI4gpu+dBAlATw2zNCUExBWLsgGsbIBEN8fFjYdx1DH89heDpP8ZXxbR1XWJP/U/WLBDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:05:08.384625Z"},"content_sha256":"55c12585c02d53e2165d7df47811145572f74ab5e771beeddf2d3320acc6b4fa","schema_version":"1.0","event_id":"sha256:55c12585c02d53e2165d7df47811145572f74ab5e771beeddf2d3320acc6b4fa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WD3O5WATV2L6C7TBSPGN4CNCAC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Antireflective nanotextures for monolithic perovskite-silicon tandem solar cells","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph","physics.optics"],"primary_cat":"physics.app-ph","authors_text":"Christiane Becker, David Eisenhauer, Duote Chen, Grit K\\\"oppel, Klaus J\\\"ager, Martin Hammerschmidt, Philipp Tockhorn, Phillip Manley, Steve Albrecht, Sven Burger","submitted_at":"2018-05-25T13:38:42Z","abstract_excerpt":"Recently, we studied the effect of hexagonal sinusoidal textures on the reflective properties of perovskite-silicon tandem solar cells using the finite element method (FEM). We saw that such nanotextures, applied to the perovskite top cell, can strongly increase the current density utilization from 91% for the optimized planar reference to 98% for the best nanotextured device (period 500 nm and peak-to-valley height 500~nm), where 100% refers to the Tiedje-Yablonovitch limit.\n  In this manuscript we elaborate on some numerical details of that work: we validate an assumption based on the Tiedje"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.10152","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":"2026-05-18T00:14:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VV8YDNmZ/vKmU4PaMBVZf1IJm/JxRValnn0jGAhX0nO7hTrmREy1JpciJhgxD9Fvvie8ZBn54kVnOUJtstCSAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:05:08.384984Z"},"content_sha256":"fbeda4b62be9cf0a5729e89f3dec6cad9f3a51c66f8fd9971d82299ebf1aaeef","schema_version":"1.0","event_id":"sha256:fbeda4b62be9cf0a5729e89f3dec6cad9f3a51c66f8fd9971d82299ebf1aaeef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WD3O5WATV2L6C7TBSPGN4CNCAC/bundle.json","state_url":"https://pith.science/pith/WD3O5WATV2L6C7TBSPGN4CNCAC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WD3O5WATV2L6C7TBSPGN4CNCAC/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":"2026-06-02T02:05:08Z","links":{"resolver":"https://pith.science/pith/WD3O5WATV2L6C7TBSPGN4CNCAC","bundle":"https://pith.science/pith/WD3O5WATV2L6C7TBSPGN4CNCAC/bundle.json","state":"https://pith.science/pith/WD3O5WATV2L6C7TBSPGN4CNCAC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WD3O5WATV2L6C7TBSPGN4CNCAC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WD3O5WATV2L6C7TBSPGN4CNCAC","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":"f378ccd59904812b4a82342e6f57b10b197478f416b3bc9d401febff3eed3774","cross_cats_sorted":["physics.comp-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-05-25T13:38:42Z","title_canon_sha256":"3cfc780e4c293ee1421892544b55de800795592a6e9f73c41c5cf04ea663130a"},"schema_version":"1.0","source":{"id":"1805.10152","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.10152","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"arxiv_version","alias_value":"1805.10152v1","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.10152","created_at":"2026-05-18T00:14:53Z"},{"alias_kind":"pith_short_12","alias_value":"WD3O5WATV2L6","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"WD3O5WATV2L6C7TB","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"WD3O5WAT","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:fbeda4b62be9cf0a5729e89f3dec6cad9f3a51c66f8fd9971d82299ebf1aaeef","target":"graph","created_at":"2026-05-18T00:14:53Z","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":"Recently, we studied the effect of hexagonal sinusoidal textures on the reflective properties of perovskite-silicon tandem solar cells using the finite element method (FEM). We saw that such nanotextures, applied to the perovskite top cell, can strongly increase the current density utilization from 91% for the optimized planar reference to 98% for the best nanotextured device (period 500 nm and peak-to-valley height 500~nm), where 100% refers to the Tiedje-Yablonovitch limit.\n  In this manuscript we elaborate on some numerical details of that work: we validate an assumption based on the Tiedje","authors_text":"Christiane Becker, David Eisenhauer, Duote Chen, Grit K\\\"oppel, Klaus J\\\"ager, Martin Hammerschmidt, Philipp Tockhorn, Phillip Manley, Steve Albrecht, Sven Burger","cross_cats":["physics.comp-ph","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-05-25T13:38:42Z","title":"Antireflective nanotextures for monolithic perovskite-silicon tandem solar cells"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.10152","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":"sha256:55c12585c02d53e2165d7df47811145572f74ab5e771beeddf2d3320acc6b4fa","target":"record","created_at":"2026-05-18T00:14:53Z","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":"f378ccd59904812b4a82342e6f57b10b197478f416b3bc9d401febff3eed3774","cross_cats_sorted":["physics.comp-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-05-25T13:38:42Z","title_canon_sha256":"3cfc780e4c293ee1421892544b55de800795592a6e9f73c41c5cf04ea663130a"},"schema_version":"1.0","source":{"id":"1805.10152","kind":"arxiv","version":1}},"canonical_sha256":"b0f6eed813ae97e17e6193ccde09a2008f40c5225664c09c85d20dc6a0e59b1c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b0f6eed813ae97e17e6193ccde09a2008f40c5225664c09c85d20dc6a0e59b1c","first_computed_at":"2026-05-18T00:14:53.056235Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:14:53.056235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K/kTAMwt87DA/Fa6HqnRHbWGFjodUUdiNYapV3KSM0pXXcGnXfc6WhuE/Z4o1xSsQMEef2hXV+EnXUtbN6mEAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:14:53.056871Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.10152","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:55c12585c02d53e2165d7df47811145572f74ab5e771beeddf2d3320acc6b4fa","sha256:fbeda4b62be9cf0a5729e89f3dec6cad9f3a51c66f8fd9971d82299ebf1aaeef"],"state_sha256":"aec3d7d30632f817621c03fa9094705e2f8f1bee093fbacb2cad180edcc27c98"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LuPraBouAhs6YS83z6gb3XBncar1wG2bot9R5NTrSfdOdf2n5+eeTMJb3XS9htrlSYCEbnq31uTsLWIMuEb5Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T02:05:08.387042Z","bundle_sha256":"2b51b0e2912090dc099df83a7c066f5f8703917990377b561d642b1f7b242eb8"}}