{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"cd2e26eee6d57cadf9d361d43320fc2803d73f95c47a089139479f8a8a14e4ec","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5ee2e10d27d8219cd612b8ced707c297bf67d5a12bf4fa61580742646a4a2542","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"9b8718da53036fbbb34c47bb3b20a4d3cbc7c1aaa1da6845ba86163803719703","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.halide-perovskites.hot-carrier-cooling","kind":"phenomenon","literature_status":"partially-resolved","n":"2","parents":[],"plain":"Light with extra energy creates hot charges that normally lose that excess to the lattice within a fraction of a trillionth of a second. In perovskites they stay hot much longer at high light intensity, and why is debated.","posed_since":"","precise":"At excitation densities above about $10^{18}\\,\\mathrm{cm}^{-3}$, hot-carrier cooling in MAPbI3 and $\\mathrm{CsPbBr_3}$ slows from about 0.3 ps to tens or hundreds of ps. Separate the contributions of the hot-phonon bottleneck (slow decay of longitudinal-optical phonons), Auger reheating, and large-polaron screening, and determine whether any slowdown persists below $10^{17}\\,\\mathrm{cm}^{-3}$, the density under sunlight. An answer is quantified cooling-time contributions versus density and temperature.","problem_ref":"5ee2e10d27d8219cd612b8ced707c297bf67d5a12bf4fa61580742646a4a2542","references":"","settled_by":"Density-resolved two-dimensional or transient spectroscopy with direct phonon-population probes, reproduced by a coupled carrier-phonon kinetic model.","status_note":"The hot-phonon bottleneck at high density is widely accepted; the low-density polaron-screening claim remains contested.","title":"Mechanism of slow hot-carrier cooling in lead-halide perovskites","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"c651cd903615880ebe971de701724d898596a0c98fc36a277d4f7463a6757bb9","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c2bff1e0d0697c8ba799f834f2dad4203444b21dae5abddb389ea1e6ddee6498","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"SZ9okxDa_nr6zTE3LnN-YrbSi0ABHr6uk-T5ofrRStTo75VPQbyiLO1Fp_jLe3yN0EDkjSZ4w7p9UTxrkU7pBA"},"schema":"pubphys.envelope/1"},"record_hash":"c651cd903615880ebe971de701724d898596a0c98fc36a277d4f7463a6757bb9","leaf_index":2822}